UnevenWalter Schumann, Gemstones of the world (2001) More from other references, UnevenWalter Schumann, Gemstones of the world (2001) More from other references, Uneven
Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal
(Zn,Fe)SMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
SrCO 3Walter Schumann , Gemstones of the world (2001) More from other references