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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.
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
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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