Tenacity
-
Brittle
Solubility
-
H₂SO₄
Durability
-
-
Specific Gravity
3.312.74-3.00
1
7.18
👆🏻
Fracture
Uneven
Uneven
Cleavage
{110} Good
Distinct on {0001} imperfect on {11 2 0}
Mohs Hardness
5.5-65-5.5
2
10
👆🏻
Chemical Composition
(Fe2+ ,Mg)Al 2(PO 4) 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)
Na 4(Ca,Ce) 2(Fe,Mn,Y)ZrSi 8O 22(OH,Cl) 2Ulrich Henn and Claudio C.