Conchoidal, Splintery, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle
UnevenWalter Schumann, Gemstones of the world (2001) More from other references, UnevenWalter Schumann, Gemstones of the world (2001) More from other references, Uneven
AlPO4 · 2(H2O)
(Zn,Fe)SMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references