Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.74-2.762.33-2.37
1
7.18
👆🏻
Fracture
Uneven
Uneven
Cleavage
{010} Perfect, {001} Distinct
Perfect on {001}, imperfect on {110}
Mohs Hardness
3.5-44.5-5
2
10
👆🏻
Chemical Composition
Fe3+ PO 4 · 2H 2OAnthony et al , Handbook of Mineralogy (2001)
(K,Na)Ca4Si8O20(F,OH)•8(H2O)