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#moissanite

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Not sure what to vote for in match 1 of #MinCup23? Here's a summary:

#Moissanite
SiC
Name: after Henri Moissan, who discovered it in Canyon Diablo Meteorite
Natural occurrence: as presolar grains in meteorites; in kimberlites (origin: Earth's mantle)
Neat fact: changes color when heated
#Kaolinite
Al2(Si2O5)(OH)4
Name: derived from Gaoling, China
Natural occurrence: widespread weathering product of Al-Si minerals
Neat fact: used in prehistoric times for pottery

mineralcup.org/2023/campaigns/

We have 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 ) presentation:
oca.eu/images/LAGRANGE/EcolesT

I'll start some early campaigning for #Moissanite, because synthetic #Moissanite (SiC) is also super-interesting from a materials science perspective 🤩 #MinCup23

Natural #Moissanite has a huge color variation from green and blue to black depending on composition. It was first identified in 1904 by Henri Moissan in a sample from the Canyon Diablo meteorite found near Barringer Crater.
📷 A Silver - BYU Mineral Specimens 799 USGS Photographic Library