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. |
| | |
Classification
|
| Dana Class: |
61.1.1.2 (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).] |
| | |
Crystallography
|
| 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) |
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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. |
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Other Information
|
| References: |
NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32) |
