Color
Yellow, Brown, Red, White, Green, Reddish, Black
Colorless, White, Yellow, Green, pink, Violet
Cleavage
{0001}, {11 2 0} imperfect
Perfect on {001}, imperfect on {110}
Chemical Composition
Zn 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(K,Na)Ca4Si8O20(F,OH)•8(H2O)