Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.264.95-5.0
1
7.18
👆🏻
Fracture
Uneven
Uneven
Cleavage
None
Imperfect to indistinct on {10 1 0}, parting on {0001}
Mohs Hardness
-99994-5
2
10
👆🏻
Chemical Composition
NaFe3+3Fe3+6(BO 3) 3Si 6O 18(O,OH) 4Anthony et al , Handbook of Mineralogy (2001)
(Ce,La)(CO 3)FMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references