Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.28-3.443.07-3.13
1
7.18
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Fracture
Uneven, Splintery
Conchoidal, Uneven
Cleavage
Perfect on {110}, intersecting at 56° and 124°; partings on {100} and {010}
{100} Perfect, {010} Distinct, {102} Distinct
Mohs Hardness
5.0-6.03-3.5
2
10
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Chemical Composition
Na2Fe2+3Fe3+2Si8O22(OH)2
Zn 2(Fe2+ ,Mn2+ )(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references