ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Uneven, torn surfaces, (e.g. fractured metals)., Uneven, Gemstones (2009), torn surfaces, (e.g. fractured metals).
SiO 2 + H 2OUlrich Henn and Claudio C.
FeO(OH)Arthur Thomas , Gemstones (2009)