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1000 results for “silicatefondue”
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Fractured Nature
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Repost from MinCup24: Antimony Tin Oxide scatters the wavelengths of infrared light emitted by warm humans. The antimony is often sourced from #stibnite. This material is being used to create fabric infrared invisibility cloaks!
from Jeong et al. (2020) NPG Asia Materials
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Antimony Tin Oxide scatters the wavelengths of infrared light emitted by warm humans. The antimony is often sourced from #stibnite. This material is being used to create fabric infrared invisibility cloaks!
from Jeong et al. (2020) NPG Asia Materials
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We have #Moissanite crystals that formed in other stars! Dissolve some meteorites almost completely, and some of the residue is SiC -these grains have carbon and silicon isotopes produced in red giant stars and supernova; from before our solar system formed. See Larry Nittler's (now at Arizona State University #ASU) presentation:
https://www.oca.eu/images/LAGRANGE/EcolesThematiques/Houches_2017/pdf/5a_Presolar_grains_Nittler.pdf
#MinCup23 #Cosmochemistry #Stardust -
I used to have a set of #kaolinite dinnerware, but now it's just mullite. #Moissanite can take the heat -up to 2500°C. #MinCup23
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Unconformity between the imported Scottish Old Red Sandstone for Morgan's department store (addition built in 1923) and the brutalist addition by the Hudson's Bay Company (1964).
#Montreal #HudsonsBay #BrutalistArchitecture #OldRedSandstone
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Beautiful cathode-luminescence images showing trace-element zoning and changes in fluid composition during growth of jadeite.
From: Sorena Sorensen, George E Harlow, Douglas Rumble III (2006) The origin of jadeitite-forming subduction-zone fluids: CL-guided SIMS oxygen-isotope and trace-element evidence. American Mineralogist 91: (7) 979-996
#Jade #Mineralogy #Subduction #Geology #Metasomatism #Smithsonian #NMNH
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Beautiful cathode-luminescence images showing trace-element zoning and changes in fluid composition during growth of jadeite.
From: Sorena Sorensen, George E Harlow, Douglas Rumble III (2006) The origin of jadeitite-forming subduction-zone fluids: CL-guided SIMS oxygen-isotope and trace-element evidence. American Mineralogist 91: (7) 979-996
#Jade #Mineralogy #Subduction #Geology #Metasomatism #Smithsonian #NMNH
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@barrygoldman1 They're not all preserved in the same rock! The last metamorphic event recorded in this sample annealed out all the growth zoning in the major rock-forming minerals.
Some of the evidence is preserved in the younger tonalites that contain more resistant minerals like zircon...
#geology #metamorphism -
#Zircon doesn't just keep time; it can record temperature too. The image is of a ~4mm zoned zircon crystal from the Bancroft-area of Ontario (Grenville-age granulite metamorphics). The trenches are 40 and 60 microns wide, created by laser-ablation #ICPMS analyses.
~3.5 parts per million titanium corresponds to crystallization temperatures of ~ 675°C (plus or minus a lot, unfortunately, in this case).
#MinCup23 #metamorphism -
#Neptunite is one of a few calcium-free titanium silicates (incl. benitoite). Seems like an obscure fact but:
#Zircon includes titanium in its structure, as a function of temperature; this can be a #geothermometer.
To standardize a microbeam analysis (like laser ablation ICPMS), we need a mineral with a known composition, lots of titanium and silica and no calcium, which has an isotope at mass 48. Neptunite and benitoite are perfect for this.
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@NellytheWillow Sgraffito is used on buildings too -since the Renaissance, I think. This is the technique on a building in Prague.
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#Ringwoodite is a second chance for #Spinel (which lost out to #Vivianite earlier). Ringwoodite has the chemistry of olivine (Mg2SiO4) but the crystal structure of spinel (MgAl2O4).
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Opaque #spinel is the main aluminum-bearing mineral in the Earth's upper mantle. Here surrounded by pale olivine brown orthopyroxene and green clinopyroxene.
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The non-detection of #perovskite in non-stars shows that it's there.
Cool red dwarf stars have deep absorption bands from TIO gas in their atmospheres. In yet cooler brown dwarfs those bands have disappeared: opaque perovsite dust has condensed, making the titanium invisible.
Spectra from Kesseli et al. (2017), images from Gabicca, LEAP group.
#MinCup24 #Astronomy #RedDwarf #BrownDwarf #L_Dwarf -
Kate at MtlCityWeblog @mtlweblog posts:
https://mtlcityweblog.com/2025/07/17/street-trees-are-drinking-from-leaky-water-mains/
a New Scientist article:
https://archive.ph/5gJNi about André Poirier's Goldschmidt abstract:
Montreal street trees get more water than park trees due to leaking water mains under them. This can be traced due to the isotopically distinct lead found in the old lead pipes of the mains.Two wrongs make right healthy trees explained.
#Montreal #UQAM #Goldschmidt2025 #UrbanTrees #IsotopeGeochemistry #Lead #WaterMains
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@NadWGab #Cinnabar has the exact same symmetry as #quartz ! They are both trigonal with space group 3(1) 2 1 ( @MineralCup cleverness)
They both lack a center of inversion, and they are both piezoelectric.
One could imagine a heavy-metal tolerant species sporting cinnabar-resonator timepieces.
#MinCup23 -
@oshwassociation I enjoyed watching your Show and Tell, @deshipu
Very clever designs!
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Mac Rutherford (Professor Emeritus of Geological Sciences, Brown University) has passed away
Excerpts from Julie Hammer’s announcement on the MSA listserv:
Mac developed an experimental phase equilibrium approach to constrain magma conditions prior to eruption.
He also studied the solubility and speciation of sulfur in magma, mineral barometry, & the kinetics of crystal nucleation & growth.
Shared LinkedIn page:
https://www.linkedin.com/posts/venezky_i-write-with-sad-news-which-may-or-may-not-activity-7115486557502902272-UuI_?
#minerals #geology #ExperimentalPetrology #BrownU -
Congratulations to Shaunna Morrison (Earth & Planets Laboratory, Carnegie Science), the recipient of the 2023 Mineralogical Society of America award. The award was presented at the #GSAConnects meeting.
She studies crystal chemical behavior and bonding systematics in minerals, is part of the #MarsCuriosity science team and is a pioneer in #MineralInformatics.
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Seen at the #GSAConnects meeting
Bare floors rather than temporarily carpeted floors to reduce meeting's impact.
Repost from X site of JosephKerski
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Talk this afternoon by Kathryn Smith, Dalhousie University at #GSAConnects:
Creating groundwater-sourced thermal refuges in rivers to adapt to a warming world
191: T21. Environmental and Engineering Geology Division II
Tues., 17 Oct. 2023, 1:35–1:50 p.m.
https://gsa.confex.com/gsa/2023AM/meetingapp.cgi/Paper/392393Smith and coauthor Barret Kurylyk added cold pumped groundwater to a Nova Scotia stream to aid spawning salmon and trout.
#GeoSociety #Salmon #DalhousieUniversity #EarthSystemScience -
Katie Maloney (#McGillUniversity) is presenting today (Monday) at #GSAConnects at 5:15 pm.
She's in the session: 125: T68. Temperature, Oxygen, and Their Synergistic Effects on Animal Ecosystems
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Monday and Wednesday early-career presenters at #GSAConnects in #Pittsburgh
*Katie Maloney*
Early Tonian Macroalgal Ecosystems from Northwestern Canada
(125-14) Monday 5:15 pm*Charlotte Spruzen*
Complex Neoproterozoic Microbial Reefal Frameworks in the Callison Lake formation of Yukon
(223-9) *TODAY* 10:25 am#McGillUniversity #EarthSystemScience #GSA2023 #GeoScience #GSAConnects2023
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Proxy evidence for a hot summer: the Aji peppers are ripening a month earlier than usual...
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A very productive hour spent learning about Earth's primary productivity (organic molecules produced) over time via a talk by Peter Crockford, Carleton University.
Fun fact: every carbon atom has likely be cycled through an organism ~100 times over the last 3+ billion years!
Crockford et al., The geologic history of primary productivity, Current Biology (2023), https://doi.org/10.1016/ j.cub.2023.09.040
#CarletonU #McGillUniversity #Photosynthesis #EarthSystemScience #Proterozoic #Geology
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Congratulations to @natalyagomez for her 2023 #IUGG Early Career Scientist award. From Natalya Gomez's citation:
"for her seminal contributions to our understanding of the connections between the cryosphere and sea level change, at the border of geophysical and climate sciences."
#McGillUniversity #Cryosphere #Geophysics