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Aragonite var. Tarnowitzite, Tsumeb mine, Tsumeb, Otjikot, Namibia (#:MINS8656)

Rare and nice tarnowitzite crystals up to 1,5 cm wide on matrix.

Formula :
Ca₁₂Al₂[Si₆O₁₇]₃ * 18 H₂O
System: monoclinic Hardness:5 Rarity:rare
Strunz id:VIII/F.21-40 - SILICATES
Name origin: From Gaelic "tacharan", a changeling, because the mineral breaks down into other compounds if left standing in air.