Jervisite Mineral Data

General Information

Chemical Formula: (Na,Ca,Fe++)(Sc,Mg,Fe++)Si2O6
IMA Status: Approved IMA


Dana Class: 65.1.3c.6 (65)Single-Width Unbranched Chains, W=1 (65.1)with chains P=2 (65.1.3c)C2/c clinopyroxenes (Na clinopyroxenes)
Strunz Class: VIII/F.01-150 - Silicates [Inosilicates (chain and band) double chains [Si2O6]4- (Pyroxene group, Clinopyroxene).]


Axial Ratios: a:b:c =1.0896:1:0.5874
Cell Dimensions: a = 9.853, b = 9.042, c = 5.312, Z = 4; beta = 106.62° V = 453.48
Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C2/c
X Ray Diffraction: By Intensity(I/Io): 3.038(1) 2.543(0.75) 2.979(0.75)

Physical Properties

Cleavage: [110] Perfect
Color: light green.
Density: 3.22
Diaphaniety: Transparent to Translucent
Hardness: 6-7 - Orthoclase-Quartz
Luster: Vitreous (Glassy)
Streak: white

Optical Properties

Optical Data: Biaxial (-), a=1.683, b=1.715, g=1.724, bire=0.0410

Other Information

References: PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
See Also: Athena Mineralogy
  Frederic Biret
  ╔cole des Mines de Paris

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