Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.74-2.762.52-2.60
1
7.18
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Fracture
Uneven
Uneven, Conchoidal
Cleavage
{010} Perfect, {001} Distinct
{0001} Imperfect, {1120} Imperfect
Mohs Hardness
3.5-45.5-6
2
10
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Chemical Composition
Fe3+ PO 4 · 2H 2OAnthony et al , Handbook of Mineralogy (2001)
KCa 2AlBe 2Si 12O 30 · 0.5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references