#calcite — Public Fediverse posts

#Calcite “Flowers”
#Brazil
20cm
Photo by Thomas Spann
By #GeologicalWondersToo / Karen Kemp
#Geology #GeologyPage #Nature #Minerals #Crystals #Gems #NatureLovers #NaturePhotography #Photographer #RockPorn

#Calcite on #Stilbite
Pinnacle Island, Nova Scotia, #Canada
2.5cm across
Photo by Josh March
By #GeologicalWondersToo / Karen Kemp
#Geology #GeologyPage #Nature #Minerals #Crystals #Gems #NatureLovers #NaturePhotography #Photographer #RockPorn

#Calcite, #Dolomite spheres resting on matrix consisting of tan crystalline dolomite and #quartz
#Slovakia
10 x 7 cm
Photo by László Kupi
By #GeologicalWondersToo / Karen Kemp
#Geology #GeologyPage #Nature #Minerals #Crystals #Gems #NatureLovers #NaturePhotography #Photographer #RockPorn

#Calcite with #Marcasite inclusions
Indiana, #USA
5.2x4.4x3.3cm
Photo by Tomer Shapira
By #GeologicalWondersToo / Karen Kemp
#Geology #GeologyPage #Nature #Minerals #Crystals #Gems #Nature #NatureLovers #NaturePhotography #Photographer #RockPorn

Cobaltoan #Calcite
#Congo
3.1 cm
Photo by Kyoshi Kikuni
By #GeologicalWondersToo / Karen Kemp
#Geology #GeologyPage #Nature #Minerals #Crystals #Gems #Nature #NatureLovers #NaturePhotography #Photographer #RockPorn

#Calcite
Montana, #USA
Width 5 cm
Photo by Roger Lang
By #GeologicalWondersToo / Karen Kemp
#Geology #GeologyPage #Nature #Minerals #Crystals #Gems #Nature #NatureLovers #NaturePhotography #Photographer #RockPorn

#Calcite on #limestone _ Elmwood mine, Tennessee, #USA _ are certainly among the best calcites in the world.
The largest crystal measures 100mm.
By #GeologyWORLD Antonia Miglioli
#Geology #GeologyPage #Nature #Minerals #Crystals #Gems #Nature #NatureLovers #NaturePhotography #Photographer #RockPorn

Mineral Monday: The Alfie Norville Gem and Mineral Museum of Tucson Arizona The Alfie Norville Museum (gemandmineralmuseum.arizona.edu), is housed in the Pima County Courthouse in Tucson AZ. By Andrea Koziol. #MSACommunications #MineralMonday #calcite #amethyst #geode #mineralmuseum

First heart shape I saw down at the Tucson shows, and it is a slice from a giant geode, not even amethyst crystals. This was outside lining the gallery at Mineral City. Large enough and heavy enough it needed an ironwork stand. It was raised up to eye level. Last geode post on “theme” for today. ❤️
#Heart #ValentinesDay #Crystals #Tucson #Specimen #Geode #Quartz #Chalcedony #Calcite #Slab

Last geode post on “theme” for today coming up… #Heart #ValentinesDay #Crystals #Tucson #Specimen #Geode #Amethyst #Calcite

Here’s another #Heart geode, this one a type of classic geode where the interior space is filled with crystals AND there is a delightful added mineral crystal form to these amethyst geodes, often calcite. This piece was likely pricy and on the top shelf. The lighting made it very attractive. Only one more #ValentinesDay geode to share and that will be later. It’s NOT amethyst! #Crystals #Tucson #Specimen #Geode #Amethyst #Calcite

Sometimes, Open Source developers just make me laugh and facepalm at the same time. I was looking at the docs for Apache Calcite adapters and for some reason there is an adapter which lets you query your data in *PIG LATIN*?!?! #OpenSource #Calcite #ApacheCalcite #FOSS

17-Oct-2025
Drip by drip: The hidden blueprint for #stalagmite growth
stalagmites grow into flat-topped pedestals, classical columns, or pointed cones not by chance, but according to a single controlling factor – the Damköhler number – which represents a balance between the rates of #calcite precipitation and the flow of water

https://www.eurekalert.org/news-releases/1102389

#science #geology

Gli eterei e zannuti guardiani dei branchi, che nascono grigi, poi diventano bianchi
https://www.jacoporanieri.com/blog/?p=43165

#animali #parchi #africa #namibia #elefanti #mammiferi #polvere #minerali #paesaggio #circostanze #strano #visioni #notte #sole #comportamento #creature #natura #biologia #ecologia #calcite #argilla #terra #sostrato #branchi

Gli eterei e zannuti guardiani dei branchi, che nascono grigi, poi diventano bianchi
https://www.jacoporanieri.com/blog/?p=43165

#animali #parchi #africa #namibia #elefanti #mammiferi #polvere #minerali #paesaggio #circostanze #strano #visioni #notte #sole #comportamento #creature #natura #biologia #ecologia #calcite #argilla #terra #sostrato #branchi

Gorgeous #Calcite with #Fluorite and #Quartz From Yaogangxian Mine, Hunan Province, #China..(HWD): 7 X 5 X 3.5 cm

Photo Copyright ©️ Fabian Wildfang
By #GeologyWonders
#Geology #GeologyPage #Nature #Minerals #Crystals #Gems #Nature #NatureLovers #NaturePhotography #Photographer #RockPorn

#Fluorite with #Calcite from Cave-in-Rock, Hardin County, llinois, #USA.
S:55x87х66тт

Photo Copyright ©️ peanuts_minerals
By #GeologyWonders
#Geology #GeologyPage #Nature #Minerals #Crystals #Gems #Nature #NatureLovers #NaturePhotography #Photographer #RockPorn

Look at this #calcite crystal and its super strong birefringence, yielding two distinct optical paths! And yes, that's Captain Haddock, a subtle reference to the strong polarization effects in calcite sunstones, likely used as navigational aid by seafarers in the Viking Age. #MinCup25 #teamcalcite
Vote here (only a few hours left!):

https://www.mineralcup.org/2025/vote/r1m04

Calcite vs Perovskite (planetary science edition)

Most carbonates on Mars are Fe and Mg-rich (so siderite-dolomite) but the infamous meteorite Allan Hills 84001 also containts some rare calcite.

(Mg, Fe)SiO3 perovskite (same structure as CaTiO3) can form by dissociation of olivine in shocked martian meteorites (for example: shergottite Dar al Gani 735) recording extreme pressure and temperature conditions of at least 25 GPa, 700°C.

#MinCup25 #Calcite #Perovskite

Fantastic #Proustite on #Calcite From Bouismas mine, Bou Azzer District, Zagora Province, Drâa-Tafilalet Region, #Morocco.

Photo ©️ Fine mineral photography
By #GeologyWonders
#Geology #GeologyPage #Nature #Minerals #Crystals #Gems #Nature #NatureLovers #NaturePhotography #Photographer #RockPorn

A #unique #pendant with natural #Calcite made with #SterlingSilver. It's available with silver chain or durable nylon cord!

Find it on my #etsy shop pendants section here https://www.etsy.com/shop/kosmimatis/?etsrc=sdt&section_id=40789649
For more info and creations see my bio or the pinned toot!

#ShopHandmade #handmade #silver #silver925 #MastodonArt #MastoArt
#kosmimatis #jewelry #HandmadeJewelry #HandmadeGreekJewelry #HandmadeWithLove #JewelryArt #ArtisanJewelry #GreekJewelry #HandmadeGreece #GiftJewelry

Fantastic gem crystals of #emerald on #calcite from the La Pita Mine, Maripí Municipality, Boyacá Department, #Colombia.
Photo ©️ Fine mineral photography
László Kupi
By #GeologyWonders
#Geology #GeologyPage #Nature #Minerals #Crystals #Gems #Nature #NatureLovers #NaturePhotography #Photographer #RockPorn

#OpenSearch 3.0 is out! 🍾 🥳
After 3 years of 2.x, it's time for the next leap, which brings major upgrades to performance, data management, #vectorDB functionality, and much more.
📈 Upgrade to Apache #Lucene 10 and #JDK 21+
📈 Pull-based ingestion for streaming data, with support for Apache #Kafka and Amazon #Kinesis
📈 Power agentic #AI with native #MCP support
📈 Investigate logs with expanded PPL query tools, backed by Apache #Calcite

Check out @OpenSearchProject blog:
https://opensearch.org/blog/unveiling-opensearch-3-0/

Awesome Cobaltoan #Calcite from Mupine Mine, Kolwezi, DR# Congo.

Photo Copyright ©️ Mineral Masterpiece
By #GeologyWonders
#Geology #GeologyPage #Nature #Minerals #Crystals #Gems #Nature #NatureLovers #NaturePhotography #Photographer #RockPorn

Cherry-red #Proustite crystals on white #calcite, #Morocco
3 Facts about Proustite
1.It is a silver sulfarsenide mineral (Ag₃AsS₃) named after Joseph L. Proust.
2. It exhibits a striking scarlet-vermilion color.
3. It occurs in hydrothermal deposits, often found with other silver minerals in locations like Chañarcillo, Chile, Morocco, and Freiberg, Germany.
By #GeologicalWondersToo
#GeologyPage #Nature #Minerals #Crystals #Gems #Nature #NatureLovers #NaturePhotography #Photographer #RockPorn

NASA Earth Surface Mineral Dust Source Investigation (EMIT) Remote Sensing And Mapping
--
https://earth.jpl.nasa.gov/emit/ <-- shared NASA EMIT home page
--
https://phys.org/news/2023-12-nasa-emit-instrument-global-airborne.html <-- shared technical article
--
https://youtu.be/z9RjGdfxSDk?si=vMU9UAtAUcnvetwm <-- shared overview video
--
#GIS #spatial #mapping #fedscience #remotesensing #earthobservation #mineral #rockdust #source #investigation #calcite #chlorite #transport #dust #suspended #atmosphere #affects #effects #heating #cooling #albedo #spatialanalysis #spatiotemporal #nutrient #loess #publichealth #model #modeling #mineraldust
@nasa

#Spherocobaltite, #Dolomite, #Calcite
From: Kolwezi District, Katanga Copper Crescent, Katanga, Democratic Republic of #Congo
By #GeologyWonders
#Geology #GeologyPage #Nature #Minerals #Crystals #Gems #Nature #NatureLovers #NaturePhotography #Photographer #RockPorn

Deep purple #Fluorite cubes on #Calcite matrix with scattered fine orange #Sphalerite crystals, from the Elmwood Mine, Carthage, Tennessee, USA.
Photo: Fine mineral photography
László Kupi
By #GeologicalWondersToo / Karen Kemp
#GeologyPage #Nature #Minerals #Crystals #Gems #Nature #NatureLovers #NaturePhotography #Photographer #RockPorn

#WeekendReading: Mavromatis et al., on the role of sulfate in modifying the kinetic and equilibrium #Magnesium isotope fractionation between fluid and low-Mg calcite. Might be important down the line to understand the long-term Mg cycles in #calcite and #aragonite #seas.
https://doi.org/10.1016/j.gca.2024.12.011

Crazy #Manganese-Bearing #Calcite! ~ 9.3 cm 😜From Inner Mongolia, #China.
Photo Copyright ©️ Mineral Masterpiece
By #GeologyWonders
#Geology #GeologyPage #Nature #Minerals #Crystals #Gems #Nature #NatureLovers #NaturePhotography #Photographer #RockPorn

A septarian concretion is a unique rock formation characterized by its striking cracked or geometric pattern. These formations are composed of a combination of minerals, such as #calcite, #aragonite, #barite, and sometimes #pyrite, encased in a hard outer layer of #limestone or #mudstone.
https://www.geologyin.com/2017/12/what-is-septarian-concretion.html?fbclid=IwY2xjawF6ZotleHRuA2FlbQIxMQABHUlrg-EOtQBG1g5VNbu0cwPxq6jrghNg1XJrh0GHd4ddD7lCpNgQ3kI3Og_aem_vWK47Kt4Nh7FQadUWEPG_w
By #GeologyWonders
#Geology #GeologyPage #Nature #Minerals #Crystals #Gems #Nature #NatureLovers #NaturePhotography #Photographer #RockPorn

So... mineral cup ( #MinCup ) 2024 starts in September... #calcite is coming back... was there even a question?
(as long as #dolomite isn't coming back, then I'm in trouble)

Absolutely Gorgeous #Amethyst #Druse with #Calcite Gemination 'Tucson Gem & Fine Mineral Show 2024'
Photo ©️ Tucson Fine Mineral Gallery
By #GeologyWonders
#Geology #GeologyPage #Nature #minerals #crystals #gems #Nature #NatureLovers #NaturePhotography #Photographer

#ClimateCrisis: #OceanAcidification in the #Mediterranean is already affecting the #calcification of marine #plankton https://phys.org/news/2023-11-ocean-acidification-mediterranean-affecting-calcification.html paper: https://www.nature.com/articles/s43247-023-00947-7

"#Foraminifera #protists... build a shell, several hundred micrometers in size, which is made of #CalciumCarbonate... these #calcite structures are highly sensitive to changes in seawater #chemistry... This is reflected in an accelerated decrease in shell weight during the 20th century."

It's neck-and-neck between #Zircon and #Calcite in the #MinCup23 semi-final!

Zircon has knocked out my favorite #Kaolinite the past two years, and so, as revenge, I'm voting for it so it can win and be ineligible to compete in future MinCups!

(I'm sure it has some fine qualities that others will be happy to recite, but I'm driven solely by tactical considerations).

https://www.mineralcup.org/2023/campaigns/campaigns/round-4-match-1

#Calcite can form when cool groundwater warms as it rises to the surface. Calcium carbonate exhibits inverse solubility -it's less soluble in warmer water. As a result #tufa deposits can form -like those at Mono Lake. A nice write up of groundwater carbonate deposits at:
https://www.ontariobeneathourfeet.com/flowstone-travertine-and-tufa
#MinCup23 #Ontario #Carbonate #MineralSprings

A contender in this round of #MinCup23, #Calcite comes in several forms, including #Optical Calcite, sometimes called #Iceland Spar or #Iceland Crystal, the strong #birefringence properties are on display in this #photograph as the #crystal creates a small #rainbow-like formation on the right side. This property has made it a candidate for the somewhat mysterious #SunStone from #Viking legend, able to find the Sun despite overcast conditions by looking for the double #refraction.
This form of calcite often cleaves into parallelepiped (parallelogram extended into 3D) sections, such as the one pictured.

Vote in #MinCup23: https://www.mineralcup.org/2023/campaigns/campaigns/campaigns/round-2-match-5

Get a print with this image, or other merchandise at https://heronfox.pixels.com/featured/calcite-specimen-4-heron-and-fox.html

#OpticalCalcite, #IcelandSpar, #Minerology, #VoteCalcite, #Photograph, #MacroPhotography

A contender in this round of #MinCup23, #Calcite comes in several forms, including #Optical Calcite, sometimes called #Iceland Spar or #Iceland Crystal, the strong #birefringence properties are on display in this #photograph as the #crystal creates a small #rainbow-like formation on the right side. This property has made it a candidate for the somewhat mysterious #SunStone from #Viking legend, able to find the Sun despite overcast conditions by looking for the double #refraction.
This form of calcite often cleaves into parallelepiped (parallelogram extended into 3D) sections, such as the one pictured.

Vote in #MinCup23: https://www.mineralcup.org/2023/campaigns/campaigns/campaigns/round-2-match-5

Get a print with this image, or other merchandise at https://heronfox.pixels.com/featured/calcite-specimen-4-heron-and-fox.html

#OpticalCalcite, #IcelandSpar, #Minerology, #VoteCalcite, #Photograph, #MacroPhotography

A contender in this round of #MinCup23, #Calcite comes in several forms, including #Optical Calcite, sometimes called #Iceland Spar or #Iceland Crystal, the strong #birefringence properties are on display in this #photograph as the #crystal creates a small #rainbow-like formation on the right side. This property has made it a candidate for the somewhat mysterious #SunStone from #Viking legend, able to find the Sun despite overcast conditions by looking for the double #refraction.
This form of calcite often cleaves into parallelepiped (parallelogram extended into 3D) sections, such as the one pictured.

Vote in #MinCup23: https://www.mineralcup.org/2023/campaigns/campaigns/campaigns/round-2-match-5

Get a print with this image, or other merchandise at https://heronfox.pixels.com/featured/calcite-specimen-4-heron-and-fox.html

#OpticalCalcite, #IcelandSpar, #Minerology, #VoteCalcite, #Photograph, #MacroPhotography

A contender in this round of #MinCup23, #Calcite comes in several forms, including #Optical Calcite, sometimes called #Iceland Spar or #Iceland Crystal, the strong #birefringence properties are on display in this #photograph as the #crystal creates a small #rainbow-like formation on the right side. This property has made it a candidate for the somewhat mysterious #SunStone from #Viking legend, able to find the Sun despite overcast conditions by looking for the double #refraction.
This form of calcite often cleaves into parallelepiped (parallelogram extended into 3D) sections, such as the one pictured.

Vote in #MinCup23: https://www.mineralcup.org/2023/campaigns/campaigns/campaigns/round-2-match-5

Get a print with this image, or other merchandise at https://heronfox.pixels.com/featured/calcite-specimen-4-heron-and-fox.html

#OpticalCalcite, #IcelandSpar, #Minerology, #VoteCalcite, #Photograph, #MacroPhotography

A contender in this round of #MinCup23, #Calcite comes in several forms, including #Optical Calcite, sometimes called #Iceland Spar or #Iceland Crystal, the strong #birefringence properties are on display in this #photograph as the #crystal creates a small #rainbow-like formation on the right side. This property has made it a candidate for the somewhat mysterious #SunStone from #Viking legend, able to find the Sun despite overcast conditions by looking for the double #refraction.
This form of calcite often cleaves into parallelepiped (parallelogram extended into 3D) sections, such as the one pictured.

Vote in #MinCup23: https://www.mineralcup.org/2023/campaigns/campaigns/campaigns/round-2-match-5

Get a print with this image, or other merchandise at https://heronfox.pixels.com/featured/calcite-specimen-4-heron-and-fox.html

#OpticalCalcite, #IcelandSpar, #Minerology, #VoteCalcite, #Photograph, #MacroPhotography

Blog post by Erin Gibbons explaining the importance of the #Perseverance rover's approach to locations identified as carbonate-rich from instruments in orbit above Mars.
#Mars2020 #McGillUniversity #MinCup23 #calcite #siderite #magnesite

https://mars.nasa.gov/mars2020/mission/status/478/reading-the-rocks-the-importance-of-the-margin-carbonate-unit-on-mars/

The last few days have been hollowing. I bought myself a treat to help. Selenite chunk of goodness, now living beside some big calcites.

#selenite #calcite #minerals #crystals #collections #rocks #nature #pagan #altar

Got a few new fluorescent mineral pieces for what I've dubbed the "party bowl". It's surprisingly difficult to get a good picture with the UV flashlight. (Also the flashlight tells me everywhere I need to dust. :( )
#minerals #mineralcollection #fluorescence #uvreactive #ruby #fluorite #kunzite #calcite #petrifiedwood

À la découverte d’un volcan très spécial, le Kaiserstuhl
https://www.futura-sciences.com/planete/actualites/geologie-decouverte-volcan-tres-special-kaiserstuhl-99701/ - Morgane Gillard

#Géologie #Volcan #Allemagne #kaiserstuhl #carbonatite #calcite #lave #magma