ConchoidalGemdat.org, Management Team (2012), ConchoidalGemdat.org, Management Team (2012)
UnevenArthur Thomas, Gemstones (2009) Tough, UnevenArthur Thomas, Gemstones (2009) Tough, Brittle, Uneven
(Cu) 3(OH) 2(CO 3) 2 + Cu 2(CO 3)(OH) 2Gemdat.org , Management Team (2012)
Mn 8Si 6O 15(OH,Cl) 10Ulrich Henn and Claudio C.