Tenacity
Brittle
Brittle
Solubility
-
H₂SO₄
Durability
-
-
Specific Gravity
6.50-7.002.74-3.00
1
7.18
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Fracture
Irregular, Conchoidal
Uneven
Cleavage
On {011}, distinct; on {001}, {013}, indistinct
Distinct on {0001} imperfect on {11 2 0}
Mohs Hardness
35-5.5
2
10
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Chemical Composition
PbMoO 4Walter Schumann , Gemstones of the world (2001)
Na 4(Ca,Ce) 2(Fe,Mn,Y)ZrSi 8O 22(OH,Cl) 2Ulrich Henn and Claudio C.