Rubicline Mineral Data

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.

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

Physical Properties of Rubicline

Color:

Colorless.

Diaphaniety:

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

Optical Data:

Biaxial (?), a=1.52, b=1.524, g=1.527, bire=0.0070

Calculated Properties of Rubicline

Electron Density:

r_electron=2.72 gm/cc
note: r_Rubicline=2.81 gm/cc.

Fermion Index

Fermion Index = 0.01276
Boson Index = 0.98724

Photoelectric:

PE_Rubicline= 21.89 barns/electron
U=PE_Rubicline x r_electron= 59.54 barns/cc.

Radioactivity:

GRapi = 8,449.30 (Gamma Ray American Petroleum Institute Units)

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	8,449.30	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:

76.1.1.7 (76)Tectosilicate Al-Si Framework

(76.1)with Al-Si frameworks

(76.1.1)K (Na,Ba) feldspars

76.1.1.1 Orthoclase KAlSi3O8 C 2/m 2/m

76.1.1.2 Sanidine (K,Na)(Si,Al)4O8 C 2/m 2/m

76.1.1.3 Hyalophane (K,Ba)Al(Si,Al)3O8 C 2/m 2/m

76.1.1.4 Celsian BaAl2Si2O8 I21/c 2/m

76.1.1.5 Microcline KAlSi3O8 C1 1

76.1.1.6 Anorthoclase (Na,K)AlSi3O8 C1 1

76.1.1.7 Rubicline ! (Rb,K)AlSi3O8 P1 1

76.1.1.8 Filatovite! K[(Al,Zn)2(As,Si)2O8] I2/c 2/m

Strunz Class:

VIII/J.06-35 VIII - Silicates

VIII/J - Tectosilicates (network) without anions unfamiliar to the tetraheders

VIII/J.06 - Feldspar group, Buddingtonite - Orthoclase - Slawsonite series

VIII/J.06-10 Buddingtonite (NH4)AlSi3O8·0.5(H2O) P 2₁ or P 2₁/m Mono

VIII/J.06-15 Kokchetavite! KAlSi3O8 P 6/mmm(?) 6/m 2/m 2/m

VIII/J.06-20 Sanidine (K,Na)(Si,Al)4O8 C 2/m 2/m

VIII/J.06-30 Microcline KAlSi3O8 C1 1

VIII/J.06-35 Rubicline (Rb,K)AlSi3O8 P1 1

VIII/J.06-40 Orthoclase KAlSi3O8 C 2/m 2/m

VIII/J.06-50 Hyalophane (K,Ba)Al(Si,Al)3O8 C 2/m 2/m

VIII/J.06-60 Celsian BaAl2Si2O8 I21/c 2/m

VIII/J.06-70 Paracelsian BaAl2Si2O8 P 2₁/c 2/m

VIII/J.06-80 Slawsonite (Sr,Ca)Al2Si2O8 P 2₁/a 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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Rubicline

(Rb,K)AlSi3O8
Dana No: 76.1.1.7 Strunz No: VIII/J.06-35
Locality:

Notes: