Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal
ConchoidalWalter Schumann, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Metallic
Ca(Li 2Al)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Be 2BO 3(OH)Ulrich Henn and Claudio C.