Blue, Grey, Greenish, Yellow, White, gray, Green, Brown
White, White, Colorless, Red, Reddish
Uneven, Conchoidal
Uneven, Brittle, Metallic, Gemstones (2009)
Not Available
Na 2[Al 2Si 3O 10] · 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references