Tenacity
-
Brittle
Solubility
insoluble
-
Durability
-
-
Specific Gravity
2.363.28-3.44
1
7.18
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Fracture
Uneven, Subconchoidal, Fibrous
Uneven, Splintery
Cleavage
[110] perfect, [101] good, [010] distinct
Perfect on {110}, intersecting at 56° and 124°; partings on {100} and {010}
Mohs Hardness
3.5-45.0-6.0
2
10
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Chemical Composition
Al 3(PO 4) 2(OH,F) 3 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Na2Fe2+3Fe3+2Si8O22(OH)2