Yellow, Red, Reddish, Brown, Colorless, White, Yellow, Red, Reddish, Brown, Colorless, White, gray, White, gray, Reddish, White, gray, Reddish, White, gray, Reddish
Green
White
Greenish, White, Greenish, White
Conchoidal, Uneven
Conchoidal, ConchoidalAnthony et al, Conchoidal, Brittle, Conchoidal
KAl3(SO4)2(OH)6
(Zn,Cu)Al 6(PO 4) 4(OH) 8 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)