White, White, Colorless, Red, Reddish
Colorless, White, Brownish, Reddish, Black, Brownish, Black, Colorless, gray, White, Reddish, Brown
Uneven, Brittle, Metallic, Gemstones (2009)
Uneven
Na 2[Al 2Si 3O 10] · 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Na 3AlF 6Ulrich Henn and Claudio C.