Uneven, UnevenArthur Thomas, Gemstones (2009)
Uneven, Uneven, ConchoidalGemdat.org, Management Team (2012)
Pb 26Ag 10Cu 24Cl 62(OH) 48 · 3H 2OWalter Schumann , Gemstones of the world (2001) More from other references
Mn 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)