Southern and central Africa
Australia, Southern and central Africa
ConchoidalGemdat.org, Management Team (2012), ConchoidalGemdat.org, Management Team (2012)
UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Uneven
Not Available
Mg 6Cr 2(CO 3)(OH) 16 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references