Conchoidal, Splintery
Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Conchoidal, Brittle
KNa 2B 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006)
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references