Uneven, UnevenArthur Thomas, Gemstones (2009), Splintery
Uneven, UnevenArthur Thomas, Gemstones (2009)
Ca 2(Mg,Fe) 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.
Pb 26Ag 10Cu 24Cl 62(OH) 48 · 3H 2OWalter Schumann , Gemstones of the world (2001) More from other references