Fibrous Ulexite crystals - NaCa[B5O6(OH)6] · 5H2O - and Realgar - As4S4 - Deep Red-brown. Open Pit Mine, Boron, Kern County, California. Thanks to William S. Cordua for the sample. 10x (Fov 7 mm) #thinsection #ulexite #realgar https://t.co/a3kN8CAQJU
— Alexstrekeisen (@alexstrekeisen) Jan 8, 2022
via Twitter https://twitter.com/alexstrekeisen
January 09, 2022 at 02:18AM
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