Olmiite : CaMn2+[SiO3(OH)](OH)
5.5cm x 4.2cm x 4.2cm
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“5.5 x 4.2 x 4.2 cm. This is a HUGE ball of olmiite, truly remarkable considering that this is a rare mineral found only in the Kalahari Manganese mines, and not even identified until 1993. The sparkly dome measures over 4 cm across! It is extremely unusual to find a single cluster this large.”
Robert Lavinsky - 6th September 2007
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