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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 = 106.62ø 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.
Diaphaniety:Transparent to Translucent
Hardness:6-7 – Orthoclase-Quartz
Luster:Vitreous (Glassy)
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
École des Mines de Paris

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