Rubicline Mineral Data
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General Rubicline Information
Chemical Formula:
(Rb,K)AlSi3O8
Composition:
Molecular Weight = 313.11 gm
Potassium 3.12 % K 3.76 % K2 O
Rubidium 20.47 % Rb 22.39 % Rb2 O
Aluminum 8.62 % Al 16.28 % Al2 O3
Silicon 26.91 % Si 57.57 % SiO2
Oxygen 40.88 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Rb0.75 K0.25 AlSi3 O8
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 1998 (Dana # Added)
Locality:
San Piero in Campo, Elba, Italy. Link to MinDat.org Location Data.
Name Origin:
The name reflects its compositional and structural attributes as the rubidium analog of microcline.
Name Pronunciation:
Rubicline + Pronunciation
Synonym:
IMA1996-058
Rubicline Image
Images:
Rubicline
Comments: Rubicline (white) including grains of quartz (black) in microcline (gray) associated with albite (black) and muscovite (mottled dark gray). BSE image (AmMin, 83:1336).
Location: Pollucite-bearing rare-element pegmatite at San Piero in Campo, Elba, Italy.
Scale: Grain size 20 µm.
© American Mineralogist
Rubicline Crystallography
Axial Ratios:
a:b:c =0.6771:1:0.5518
Cell Dimensions:
a = 8.81, b = 13.01, c = 7.18, Z = 4; alpha = 90°, beta = 116°, gamma = 88° V = 739.22 Den(Calc)= 2.81
Crystal System:
Triclinic - Pinacoidal H-M Symbol ( 1 ) Space Group: P1
Physical Properties of Rubicline
Color:
Colorless.
Diaphaneity:
Transparent
Luster:
Vitreous (Glassy)
Optical Properties of Rubicline
Gladstone-Dale:
CI calc = 0.016 (Superior) - where the CI = (1-KPDcalc /KC ) KPDcalc = 0.1864,KC = 0.1895 Ncalc = 1.53
Optical Data:
Biaxial (?), a=1.52, b=1.524, g=1.527, bire=0.0070
Calculated Properties of Rubicline
Electron Density:
Bulk Density (Electron Density)=2.72 gm/cc note: Specific Gravity of Rubicline =2.81 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PERubicline = 21.89 barns/electronU=PERubicline x r electron = 59.54 barns/cc.
Radioactivity:
GRapi = 8,449.31 (Gamma Ray American Petroleum Institute Units)
Concentration of Rubicline per GRapi unit = 118.35 (PPM)
Rubicline is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.
Estimated Radioactivity from Rubicline - mild
Specimen Size Weight/Volume (Sphere) *
Calculated Activity Bequerols (Bq)
Calculated Activity Curies (Ci)
Estimated Activity GR(api)
Estimated Exposure (mRem** )/hr If Held in Hand For One Hour
1000 gm / 8.79 cm
183,355
4.96E-06
8,449.31
2.78
100 gm / 4.08 cm
18,336
4.96E-07
844.93
0.28
10 gm / 1.89 cm
1,834
4.96E-08
84.49
0.03
1 gm / 8.79 mm
183
4.96E-09
8.45
0.00
0.1 gm / 4.08 mm
18
4.96E-10
0.84
0.00
0.01 gm / 1.89 mm
2
4.96E-11
0.08
0.00
0.001 gm / 0.88 mm
0
4.96E-12
0.01
0.00
Weight of pure Rubicline in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.81 gm/cc. *
Goverment Estimate of Average Annual Exposure (
360 mRem )
**
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Rubicline Classification
Dana Class:
76.01.01.07 (76) Tectosilicate Al-Si Framework
(76.01) with Al-Si frameworks
(76.01.01) K (Na,Ba) feldspars
76.01.01.01 Orthoclase KAlSi3O8 C 2/m 2/m
76.01.01.02 Sanidine (K,Na)(Si,Al)4O8 C 2/m 2/m
76.01.01.03 Hyalophane (K,Ba)Al(Si,Al)3O8 C 2/m 2/m
76.01.01.04 Celsian BaAl2Si2O8 I21/c 2/m
76.01.01.05 Microcline KAlSi3O8 C1 1
76.01.01.06 Anorthoclase (Na,K)AlSi3O8 C1 1
76.01.01.07 Rubicline ! (Rb,K)AlSi3O8 P1 1
76.01.01.08 Filatovite ! K[(Al,Zn)2(As,Si)2O8] I2/c 2/m
Strunz Class:
09.FA.30 09 - SILICATES (Germanates)
09.F - Tektosilicates without Zeolitic H2O
09.FA -Tektosilicates without additional non-tetrahedral anions, (Al,B):Si = 1:1
09.FA.30 Buddingtonite (NH4)AlSi3O8•0.5(H2O) P 21 or P 21 /m Mono
09.FA.30 Celsian BaAl2Si2O8 I21/c 2/m
09.FA.30 Anorthoclase (Na,K)AlSi3O8 C1 1
09.FA.30 Hyalophane (K,Ba)Al(Si,Al)3O8 C 2/m 2/m
09.FA.30 Orthoclase KAlSi3O8 C 2/m 2/m
09.FA.30 Microcline KAlSi3O8 C1 1
09.FA.30 Rubicline ! (Rb,K)AlSi3O8 P1 1
09.FA.30 Sanidine (K,Na)(Si,Al)4O8 C 2/m 2/m
Other Rubicline Information
References:
NAME( CanMin, 8/99) PHYS. PROP.(Am.Min.,Vol.83,p1335-1339,1998)
See Also:
Links to other databases for Rubicline :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Rubicline
(Rb,K)AlSi3O8
Dana No: 76.01.01.07 Strunz No: 09.FA.30
Locality:
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