General Information:
Chemical Formula:
(Rb,K)AlSi3O8
Composition:
(Molecular Weight = 313.11 gm)
Potassium 3.12 % K
Rubidium 20.47 % Rb
Aluminum 8.62 % Al
Silicon 26.91 % Si
Oxygen 40.88 % O
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.
Physical Properties:
Color:
colorless.
Diaphaniety:
Transparent
Luster:
Vitreous (Glassy)
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