Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references
UnevenAnthony et al, Uneven, UnevenAnthony et al, Uneven, Brittle, Metallic
SiO 2 · nH 2OGemdat.org , Management Team (2012)
NaCaB 5O 6(OH) 6 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)