Uneven, Yellow, White, UnevenWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Metallic
UnevenWalter Schumann, Gemstones of the world (2001) More from other references, UnevenWalter Schumann, Gemstones of the world (2001) More from other references, Uneven
Ca2Al2Si3O12(OH)
(Zn,Fe)SMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references