Brittle, UnevenArthur Thomas, Gemstones (2009), Brittle, Uneven
Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Uneven
(Mg,Fe)Al 3(BO 4)(SiO 4)OUlrich Henn and Claudio C.
ThCa 2Si 8O 20Walter Schumann , Gemstones of the world (2001) More from other references