Mineralogy Database

Rubicline Mineral Data

Search Webmineral :

General Rubicline Information

Help on Chemical  Formula: Chemical Formula: (Rb,K)AlSi3O8
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Rb0.75K0.25AlSi3O8
Help on Environment: Environment: Found in a veinlet of rubidian microcline cutting pollucite in a rare-element-bearing granitic pegmatite. The rubidium dominant analog of microcline.
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: San Piero in Campo, Elba, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: The name reflects its compositional and structural attributes as the rubidium analog of microcline.
Help on Name Pronunciation: Name Pronunciation: Rubicline + Pronunciation Say RUBICLINE
Help on Synonym: Synonym: IMA1996-058

Rubicline Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image


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

Help on Axial Ratios: Axial Ratios: a:b:c =0.6771:1:0.5518
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1

Physical Properties of Rubicline

Help on Color: Color: Colorless.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Luster: Luster: Vitreous (Glassy)

Optical Properties of Rubicline

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.016 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1864,KC= 0.1895
Ncalc = 1.53
Help on Optical Data: Optical Data: Biaxial (?), a=1.52, b=1.524, g=1.527, bire=0.0070

Calculated Properties of Rubicline

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.72 gm/cc
note: Specific Gravity of Rubicline =2.81 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PERubicline = 21.89 barns/electron
U=PERubicline x relectron= 59.54 barns/cc.
Help on Radioactivity: 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
Curies (Ci)
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

Help on  Dana Class: Dana Class: (76)Tectosilicate Al-Si Framework
  (76.01)with Al-Si frameworks
  (76.01.01)K (Na,Ba) feldspars Orthoclase KAlSi3O8 C 2/m 2/m Sanidine (K,Na)(Si,Al)4O8 C 2/m 2/m Hyalophane (K,Ba)Al(Si,Al)3O8 C 2/m 2/m Celsian BaAl2Si2O8 I21/c 2/m Microcline KAlSi3O8 C1 1 Anorthoclase (Na,K)AlSi3O8 C1 1 Rubicline! (Rb,K)AlSi3O8 P1 1 Filatovite! K[(Al,Zn)2(As,Si)2O8] I2/c 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( CanMin, 8/99) PHYS. PROP.(Am.Min.,Vol.83,p1335-1339,1998)
Help on See Also: 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

Search for Rubicline using:

Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Rubicline :

Ask about Rubicline here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

Print or Cut-and-Paste your Rubicline Specimen Label here :


Dana No: Strunz No: 09.FA.30





Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.