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@doktrock@toad.social
2025-08-30 13:29:10

Yay! Mineral Cup 2025 starts September 1! Vote daily for your favorite mineral #MinCup25 ⚒️
www.mineralcup.org

A sports style bracket for voting on your favorite mineral for 2025
@doktrock@toad.social
2025-09-28 14:04:31

#MinCup25 QF4 Personally, I enjoy the six-member silicate ring structure of dioptase. Both images credit mindat.

Left, photo of dioptase on calcite. Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia A doubly-terminated crystal, 2.0 cm long, with minor dioptase and calcite crystals. Allan Young specimen and photo. A ball and stick model of the dioptase Crystal structure, looking down the sea axis, highlighting, the six membered ring structure.