Tenacity
-
Brittle
Solubility
-
H₂SO₄
Durability
-
-
Specific Gravity
3.312.74-3.00
1
7.18
👆🏻
Fracture
-
Uneven
Cleavage
Indiscernible
Distinct on {0001} imperfect on {11 2 0}
Mohs Hardness
-99995-5.5
2
10
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Chemical Composition
NaFe 3+ 3 Al 6 (BO 3 ) 3 Si 6 O 18 (O,F,OH) 4 Anthony et al, Handbook of mineralogy (2001)
Na 4(Ca,Ce) 2(Fe,Mn,Y)ZrSi 8O 22(OH,Cl) 2Ulrich Henn and Claudio C.