Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.74-2.763.80-4.15
1
7.18
👆🏻
Fracture
Uneven
Uneven
Cleavage
{010} Perfect, {001} Distinct
perfect along [010] and [100]
Mohs Hardness
3.5-43.5-4
2
10
👆🏻
Chemical Composition
Fe3+ PO 4 · 2H 2OAnthony et al , Handbook of Mineralogy (2001)
Cu 5(SiO 3) 4(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references