Brittle, Metallic, 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
Ca(VO)Si4O10•4(H2O)
(Zn,Fe)SMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references