Yellow, Green, Blue
Colorless, Colorless, Violet, White
Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references
Uneven, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
SiO 2 · nH 2OGemdat.org , Management Team (2012)
Ca 3Al 2(SO 4)(F,OH) 10Ulrich Henn and Claudio C.