Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.76-3.774.95-5.0
1
7.18
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Fracture
-
Uneven
Cleavage
{110} Perfect, {110} Perfect
Imperfect to indistinct on {10 1 0}, parting on {0001}
Mohs Hardness
5-64-5
2
10
👆🏻
Chemical Composition
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.
(Ce,La)(CO 3)FMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references