Colorless, White, Brownish, Reddish, Black, Brownish, Black, Colorless, gray, White, Reddish, Brown
Yellow, White, Brown, Brownish, Black
Uneven
Sub-Conchoidal, ConchoidalArthur Thomas, Conchoidal, Uneven
Na 3AlF 6Ulrich Henn and Claudio C.
(Fe,Mn)AlPO 4(OH) 2 -H 2OArthur Thomas , Gemstones (2009)