Colorless, White, gray, Brownish, Greenish
Colorless, Greenish, Colorless, Green, gray, Yellow
KAl 2AlSi 3O 10(OH) 2Walter Schumann , Gemstones of the world (2001) More from other references
Ca 2Al 3(SiO 4) 3(OH)Walter Schumann , Gemstones of the world (2001) More from other references