Cascandite Mineral Data

General Information

Chemical Formula: Ca(Sc,Fe++)Si3O8(OH)
 

Classification

Dana Class: 65.2.1.6(65)Single-Width Unbranched Chains,(65.2)with chains (65.2.1)Wollastonite group
Strunz Class: VIII/F.18-50 - Silicates [Inosilicates (chain and band) Triplet chains [Si3O9]6- (Wollastonite-2M - Foshagite series)]
 

Crystallography

Axial Ratios: a:b:c =0.9396:1:0.679
Cell Dimensions: a = 9.791, b = 10.42, c = 7.076, Z = 4; alpha = 98.91, beta = 102.63, gamma = 84.17 V = 692.34
Crystal System: Triclinic - Pinacoidal H-M Symbol ( -1) Space Group: C1-
X Ray Diffraction: By Intensity(I/Io): 2.821(1) 3.62(0.75) 3.1(0.65)
 

Physical Properties

Cleavage: [100] Good, [001] Good
Color: light pink.
Density: 3.01
Diaphaniety: Transparent
Hardness: 4.5-5.5
Luster: Vitreous (Glassy)
Streak: white
 

Optical Properties

Optical Data: Biaxial (?), a=1.663, g=1.684, bire=0.0210
 

Other Information

References: PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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