Australia, Southern and central Africa
Southern and central Africa
UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Uneven
Uneven, Conchoidal, Uneven, Conchoidal, Gemstones of the world (2001)
Mg 6Cr 2(CO 3)(OH) 16 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
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