Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)
ConchoidalGemdat.org, Management Team (2012), ConchoidalGemdat.org, Management Team (2012)
(Mg,Fe2+ )Al 2O 4Gemdat.org , Management Team (2012) More from other references
(Cu) 3(OH) 2(CO 3) 2 + Cu 2(CO 3)(OH) 2Gemdat.org , Management Team (2012)