Uneven, Uneven, Gemstones of the world (2001) More from other references
Uneven, Uneven, Gemstones of the world (2001) More from other references
H 4Mg 3Si 2O 9Walter Schumann , Gemstones of the world (2001) More from other references
Ca 10Mg 2Al 4(SiO 4) 5(Si 2O 7) 2(OH) 4Ulrich Henn and Claudio C.