Rhodocrosite Hillman Hall of Minerals and Gems
 
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Datolite (twinned) and Quartz
Central Boron mine, Dalnegorsk, Russia

CM27862 A penetration-twin crystal of datolite with minor quartz from the Central Boron pit in Dalnegorsk, Russia. This 6.5 cm tall specimen documents that twinned crystals of datolite can occur. It was purchased from Wright's Rock Shop in 2001.