White, Colorless, Blue, Red, Green, Yellow, Violet
Yellow, White, Brown, Brownish, Black
Not Available
Sub-Conchoidal, ConchoidalArthur Thomas, Conchoidal, Uneven
SiO 2Ulrich Henn and Claudio C.
(Fe,Mn)AlPO 4(OH) 2 -H 2OArthur Thomas , Gemstones (2009)