Bazzite Mineral Data

General Information

Chemical Formula: Be3(Sc,Al)2Si6O18
Environment: Pegmatites and alpine-vein rocks.
Locality: Lake Maggiore, Italy.
Name Origin: Named after the Italian engineer, A. E. Bazzi.


Dana Class: (61)Six-Membered Rings(61.1)with [Si6O18] rings; possible (OH) and Al substitution (61.1.1)Beryl group
Strunz Class: VIII/E.12-20 - Silicates [Cyklosilicates, six rings [Si6O18]12- (Beryl series).]


Axial Ratios: a:c = 1:0.9626
Cell Dimensions: a = 9.521, c = 9.165, Z = 2; V = 719.50
Crystal System: Hexagonal - Dihexagonal Dipyramidal H-M Symbol (6/m 2/m 2/m) Space Group: P6/mcc
X Ray Diffraction: By Intensity(I/Io): 2.94(1) 3.29(1) 1.65(0.8)

Physical Properties

Cleavage: [0001] Indistinct
Color: azure blue or dark blue.
Density: 2.8
Diaphaniety: Translucent to subtranslucent
Habits: Crystalline - Fine - Occurs as well-formed fine sized crystals., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).,
Hardness: 6.5 - Pyrite
Luminescence: Non-fluorescent.
Luster: Vitreous (Glassy)
Streak: pale bluish white

Optical Properties

Dichroism (e): pale greenish yellow.
Dichroism (w): azure blue.
Optical Data: Uniaxial (-), e=1.605, w=1.626, bire=0.0210.

Other Information

References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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