#calcite — Public Fediverse posts

#Calcite on bicolour #Fluorite
Illinois, #USA
9.5 cm
Photo by Anton Watzl
By #GeologicalWondersToo / Karen Kemp
#Geology #GeologyPage #Nature #Minerals #Crystals #Gems #NatureLovers #NaturePhotography #Photographer #RockPorn

#Calcite
#China
Dimensions 4.5 x 4 x 3 cm
Photo by Fabian Wildfang
By #GeologicalWondersToo / Karen Kemp
#Geology #GeologyPage #Nature #Minerals #Crystals #Gems #NatureLovers #NaturePhotography #Photographer #RockPorn

#Eggshells from agro-industrial waste for the recovery of #lime, #portlandite, and #calcite nanoparticles through the lime cycle: A circular economic approach

Highlights:

• The study proposes to obtain calcite (#CaCO3) from eggshell agro-industrial waste within a circular economy approach.
• The lime cycle can be used to transform calcite (CaCO3) into lime (CaO) or portlandite (Ca(OH)2).
• Eggshells contain trace elements that can aid in synthesizing materials for #EnvironmentalRemediation..

"Eggshells from agro-industrial waste can be used as natural source to obtain nanometric CaCO3, CaO, and Ca(OH)2 using the lime cycle. The nanometric size and the phase identification of all samples were confirmed by X-ray diffraction and FWHM. The SEM images show that CaCO3, CaO, and Ca(OH)2 from eggshells are microparticles in the form of nanocrystals, which correlate with the DLS results. The Zeta Potential varies due to the loss of CO2 when CaCO3 is converted in CaO, and for this reason, the CaO is more negative. When CaO is hydrated, the Ca(OH)2 is more stable, and these differences can be attributed to the mineral content in the samples. Eggshells naturally have different trace minerals that maintain a long calcium cycle and show variation due to a concentration effect when the CaCO3 changes to CaO. There is a notable a decrease of the trace minerals when CaO. When CaO is converted to Ca(OH)2, there is a significant decrease in trace minerals as some ions are soluble in the water during soaking. It is recommended to carry out the conversion of CaO to Ca(OH)2 under controlled conditions (low humidity and CO2). These findings can be useful to treat #AgroIndustrial waste and to develop nanotechnological applications in different fields."

Full article:
https://www.sciencedirect.com/science/article/pii/S2949839224000166

#SolarPunkSunday #CircularEconomy #ZeroWaste #NewTechnology #Remediation

#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

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