Tenacity
Brittle
Brittle
Solubility
slightly water soluble and in hot hydrochloric acid
H₂SO₄
Durability
-
-
Specific Gravity
3.00-3.252.74-3.00
1
7.18
👆🏻
Fracture
Subconchoidal, Uneven, ConchoidalWalter Schumann
Uneven
Cleavage
Octahedral, perfect on {111}, parting on {011}
Distinct on {0001} imperfect on {11 2 0}
Mohs Hardness
45-5.5
2
10
👆🏻
Chemical Composition
CaF2
Na 4(Ca,Ce) 2(Fe,Mn,Y)ZrSi 8O 22(OH,Cl) 2Ulrich Henn and Claudio C.