General Information
|
 Chemical Formula: |
(Rb,K)AlSi3O8 |
| Composition: |
Molecular Weight = 313.11 gm) |
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| Empirical Formula: |
Rb0.75K0.25AlSi3O8 |
| Environment: |
Found in a veinlet of rubidian microcline cutting pollucite in a rare-element-bearing granitic pegmatite. The rubidium dominant analog of microcline. |
| IMA Status: |
Approved IMA (Dana # Added) |
| Locality: |
San Piero in Campo, Elba, Italy. |
| Name Origin: |
The name reflects its compositional and structural attributes as the rubidium analog of microcline. |
| Synonym: |
IMA96.058 |
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Classification
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| Dana Class: |
76.1.1.7 (76)Tectosilicate Al-Si Framework |
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(76.1)with Al-Si frameworks |
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(76.1.1)K (Na,Ba) feldspars |
| Strunz Class: |
VIII/JX.00-00 VIII - Silicates |
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VIII/JX - Unclassified Strunz Tectosilicates |
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VIII/JX.00 - Feldspar Group - K spar |
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Crystallography
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| Axial Ratios: |
a:b:c =0.6771:1:0.5518 |
| Cell Dimensions: |
a = 8.81, b = 13.01, c = 7.18, Z = 4; alpha = 90ø, beta = 116ø, gamma = 88ø V = 739.22 Den(Calc)= 2.81 |
| Crystal System: |
Triclinic - Pinacoidal H-M Symbol ( -1) Space Group: P1- |
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Physical Properties
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| Color: |
colorless. |
| Diaphaniety: |
Transparent |
| Luster: |
Vitreous (Glassy) |
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Optical Properties
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| Optical Data: |
Biaxial (?), a=1.52, b=1.524, g=1.527, bire=0.0070 |
| Pleochroism (x): |
colorless. |
| Pleochroism (y): |
colorless. |
| Pleochroism (z): |
colorless. |
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Other Information
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| References: |
NAME( CanMin, 8/99) PHYS. PROP.(Am.Min.,Vol.83,p1335-1339,1998) |
| See Also: |
Links to other data for Rubicline :
1 -MinDat.org Location Data
2 -MinMax
3 -The Canadian Mineralogist
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