Cronstedtite

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Cronstedtite is a rare iron silicate of the serpentine group. This very rich and beautiful specimen is festooned with lustrous, black, trigonal crystals to 1-2 mm on a thin crust of matrix. The crystals are formed into crude botryoids. It is a rare occurrence to have such a rich coverage of cronstedtite, and this specimen displays very well. This is a classic rarity from the famous Siglo XX Mine of Bolivia and is very seldom available.