1 Physical Properties
1.1 Tenacity
1.2 Solubility
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
Not Available2.74-3.00
1
7.18
1.5 Fracture
Sub-Conchoidal, Splintery
Uneven, UnevenArthur Thomas, Gemstones (2009)
1.6 Cleavage
{201} Imperfect, {100} Poor, {001} Poor
Distinct on {0001} imperfect on {11 2 0}
1.7 Mohs Hardness
1.8 Chemical Composition
Not Available
Na 4(Ca,Ce) 2(Fe,Mn,Y)ZrSi 8O 22(OH,Cl) 2Ulrich Henn and Claudio C.