Uneven, Uneven, Gemstones of the world (2001) More from other references
ConchoidalAnthony et al, Handbook of mineralogy (2001), ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
Ca 10Mg 2Al 4(SiO 4) 5(Si 2O 7) 2(OH) 4Ulrich Henn and Claudio C.
Al 2(Cl 2O 12) · 18H 2OUlrich Henn and Claudio C.