Southern and central Africa
Italy, India, USA, Canada
Colorless, Greenish, Colorless, Green, gray, Yellow
White, Colorless, Green, Yellow, Brown, Brown, Colorless, Yellow, White, Green
Irregular/uneven, Uneven
Brittle, Uneven, Brittle, Uneven
Ca 2Al 3(SiO 4) 3(OH)Walter Schumann , Gemstones of the world (2001) More from other references
NaCa16Si23AlO60(OH)8•64(H2O)