Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.74-2.762.60-2.64
1
7.18
👆🏻
Fracture
Uneven
Uneven, Splintery, Conchoidal
Cleavage
{010} Perfect, {001} Distinct
Absent
Mohs Hardness
3.5-46.5-7
2
10
👆🏻
Chemical Composition
Fe3+ PO 4 · 2H 2OAnthony et al , Handbook of Mineralogy (2001)
SiO 2Arthur Thomas , Gemstones (2009)