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 % K₂O

Rubidium 20.47 % Rb 22.39 % Rb₂O

Aluminum 8.62 % Al 16.28 % Al₂O₃

Silicon 26.91 % Si 57.57 % SiO₂

Oxygen 40.88 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Rb_0.75K_0.25AlSi₃O₈

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 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 - PinacoidalH-M Symbol ( 1) Space Group: P1

Crystal Structure:

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Kyono A , Kimata M , Mineralogical Magazine , 65 (2001) p.523-531, Refinement of the crystal structure of a synthetic non-stoichiometric, Rb-feldspar, Locality: synthetic

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:

PE_Rubicline= 21.89 barns/electron
U=PE_Rubicline 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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Print or Cut-and-Paste your Rubicline Specimen Label here :

Rubicline

(Rb,K)AlSi3O8
Dana No: 76.01.01.07 Strunz No: 09.FA.30
Locality:

Notes: