Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.74-2.762.24-2.29
1
7.18
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Fracture
Uneven
Uneven, Subconchoidal, Conchoidal
Cleavage
{010} Perfect, {001} Distinct
Very poor [100]
Mohs Hardness
3.5-45-5.5
2
10
👆🏻
Chemical Composition
Fe3+ PO 4 · 2H 2OAnthony et al , Handbook of Mineralogy (2001)
NaAlSi 2O 6 · H 2OMichael OâDonoghue , Gems, Sixth edition (2006) More from other references