Journal
May 9, 2026
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Tigers Eye SiO2 pseudomorph after crocidolite asbestos, silica replaced blue asbestos keeping fiber structure for chatoyancy.
Fluorite CaF2 calcium fluoride. Latin fluere flow, fluorescence named after fluorite by George Stokes 1852.
If you've ever held a moonstone up to the light and watched that ghostly blue shimmer glide across the surface, you know why people have been obsessed with.
Kyanite Al2SiO5 polymorph with andalusite sillimanite. Unique anisotropic hardness: parallel c-axis Mohs 4.5-5, perpendicular 6-7.
Thulite is a pink manganese variety of zoisite discovered in Norway. Learn about its unique mineralogy, color formations, and why collectors prize this rare ...
Carnelian SiO2 chalcedony orange-red variety colored by iron oxide. Ancient Egypt seals amulets, Tutankhamun tomb, Napoleon wore carnelian.
Serpentine Mg3Si2O5 OH4 magnesium silicate, name from Latin serpens snake. Light to dark green yellow-green waxy greasy luster, white webbing patterns. Mohs 2.
Turquoise CuAl6 PO4 4 OH8 4H2O copper aluminum phosphate hydrate. Copper gives blue, iron makes green.
Discover the regal differences between Sodalite and Lapis Lazuli. Learn their unique features, and why they reign supreme in the crystal world.
Apophyllite KCaxNa4Si8O20F 8H2O hydrated potassium calcium silicate. Greek off leaf because it exfoliates when heated.
Scorodite FeAsO4 2H2O iron arsenate phosphate hydrate. Greek skorodon garlic because heating releases garlic smell from arsenic.