Colorless, White, Yellow, White, Greenish, gray, Brown, Colorless, Yellow
Colorless, Yellow, Brown, Green, Colorless, Green, Yellow, Red, Reddish, Brown
Conchoidal, Brittle, Conchoidal
Brittle, Metallic, Brittle, Metallic
AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references
Ca(Mg,Al)3(Al3Si)O10(OH)2