Uneven, Uneven, Gemstones of the world (2001) More from other references
Subconchoidal, Uneven, Conchoidal, Uneven
H 4Mg 3Si 2O 9Walter Schumann , Gemstones of the world (2001) More from other references
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)