Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001)
UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009)
Ca 2 MgAl 2 BSi 4 O 15 OH Gemdat.org, Management Team (2012)
Ca 2Mg 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.