Tenacity
-
Brittle
Solubility
-
H₂SO₄
Durability
-
-
Specific Gravity
2.90-3.102.74-3.00
1
7.18
👆🏻
Fracture
Splintery, Granular
Uneven
Cleavage
None
Distinct on {0001} imperfect on {11 2 0}
Mohs Hardness
6-6.55-5.5
2
10
👆🏻
Chemical Composition
Ca 2(Mg,Fe) 5(OH) 2Walter Schumann , Gemstones of the world (2001) More from other references
Na 4(Ca,Ce) 2(Fe,Mn,Y)ZrSi 8O 22(OH,Cl) 2Ulrich Henn and Claudio C.