Rubicline
A valid IMA mineral species
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About Rubicline
Formula:
Rb(AlSi3O8)
Colour:
Colourless
Lustre:
Vitreous
Crystal System:
Monoclinic
Member of:
Name:
The name reflects its compositional and structural attributes as the rubidium analog of microcline.
Feldspar Group
Unique Identifiers
Mindat ID:
7276
Long-form identifier:
mindat:1:1:7276:8
IMA Classification of Rubicline
Approved
IMA Formula:
RbAlSi3O8
Approval year:
1996
Classification of Rubicline
9.FA.30
9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
A : Tektosilicates without additional non-tetrahedral anions
9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
A : Tektosilicates without additional non-tetrahedral anions
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Rub | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Rubicline
Vitreous
Transparency:
Transparent
Colour:
Colourless
Tenacity:
Brittle
Cleavage:
Perfect
{001} perfect and {010} good
{001} perfect and {010} good
Optical Data of Rubicline
Type:
Biaxial
RI values:
nα = 1.52 nβ = 1.524 nγ = 1.527
Max. Birefringence:
δ = 0.007
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Dispersion:
strong
Chemistry of Rubicline
Mindat Formula:
Rb(AlSi3O8)
Element Weights:
Elements listed:
Crystallography of Rubicline
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 8.839(2) Å, b = 13.035(2) Å, c = 7.175(2) Å
β = 116.11(1)°
β = 116.11(1)°
Ratio:
a:b:c = 0.678 : 1 : 0.55
Unit Cell V:
742.32 ų (Calculated from Unit Cell)
Z:
4
Comment:
synthetic
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0014559 | Rubicline | Kyono A, Kimata M (2001) Refinement of the crystal structure of a synthetic non-stoichiometric Rb-feldspar Mineralogical Magazine 65 523-531 |  | 2001 | synthetic | 0 | 293 |
| 0009393 | Rubicline | Gasperin M (1971) Structure cristalline de RbAlSi3O8 _cod_database_code 1001771 Acta Crystallographica B27 854-855 |  | 1971 | 0 | 293 |
CIF Raw Data - click here to close
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites |
Type Occurrence of Rubicline
General Appearance of Type Material:
small (<50 μm) rounded grains in 1–2 cm wide veins
Place of Conservation of Type Material:
The original sample was a single unregistered fragment from the Ecole des Mines, Paris collection. Two halves of the type material are deposited in the R.B. Ferguson Museum of Mineralogy, University of Manitoba under catalogue numbers M 6980 and M 6981.
Associated Minerals at Type Locality:
Synonyms of Rubicline
Other Language Names for Rubicline
German:Rubiklin
Relationship of Rubicline to other Species
Member of:
Other Members of Alkali Feldspar:
| 'Anorthoclase' | (Na,K)AlSi3O8 | Tric. |
| Ferrisanidine | K[Fe3+Si3O8] | Mon. 2/m : B2/m |
| K Feldspar | Potassium-dominant feldspars with variable crystal symmetry and Al-Si ordering state; they are a subgroup of ... |
Common Associates
Associations Based on Photo Data:
| 6 photos of Rubicline associated with Pollucite | (Cs,Na)2(Al2Si4O12) · 2H2O |
| 4 photos of Rubicline associated with Microcline | K(AlSi3O8) |
| 2 photos of Rubicline associated with Quartz | SiO2 |
| 1 photo of Rubicline associated with Tourmaline | AD3G6(T6O18)(BO3)3X3Z |
| 1 photo of Rubicline associated with Albite | Na(AlSi3O8) |
Related Minerals - Strunz-mindat Grouping
| 9.FA. | Bonaccorsiite | KK2Na3(Al6Si36)O84 |
| 9.FA. | Hexacelsian | BaAl2Si2O8 |
| 9.FA. | Wodegongjieite | KCa3(Al7Si9)O32 |
| 9.FA.05 | Panunzite | (K,Na)AlSiO4 |
| 9.FA.05 | Yoshiokaite | (Ca,Na)[Al(Al,Si)O4] |
| 9.FA.05 | Nepheline | Na3K(Al4Si4O16) |
| 9.FA.05 | Trinepheline | NaAlSiO4 |
| 9.FA.05 | Davidsmithite | (Ca,◻)2Na6Al8Si8O32 |
| 9.FA.05 | Kaliophilite | KAlSiO4 |
| 9.FA.05 | Kalsilite | KAlSiO4 |
| 9.FA.05 | 'Carnegieite' | NaAlSiO4 |
| 9.FA.05 | Megakalsilite | KAlSiO4 |
| 9.FA.05 | Trikalsilite | K2NaAl3(SiO4)3 |
| 9.FA.10 | Malinkoite | NaBSiO4 |
| 9.FA.15 | Virgilite | LiAlSi2O6 |
| 9.FA.25 | Lisitsynite | KBSi2O6 |
| 9.FA.30 | Ferrisanidine | K[Fe3+Si3O8] |
| 9.FA.30 | Buddingtonite | (NH4)(AlSi3O8) |
| 9.FA.30 | 'Monalbite' | NaAlSi3O8 |
| 9.FA.30 | Microcline | K(AlSi3O8) |
| 9.FA.30 va | 'Germanate-celsian' | BaAl2Ge2O8 |
| 9.FA.30 | Celsian | Ba(Al2Si2O8) |
| 9.FA.30 | Sanidine | K(AlSi3O8) |
| 9.FA.30 | Orthoclase | K(AlSi3O8) |
| 9.FA.35 | Reedmergnerite | NaBSi3O8 |
| 9.FA.35 | Albite | Na(AlSi3O8) |
| 9.FA.35 | Anorthite | Ca(Al2Si2O8) |
| 9.FA.40 | Paracelsian | Ba(Al2Si2O8) |
| 9.FA.45 | Svyatoslavite | Ca(Al2Si2O8) |
| 9.FA.45 | Kumdykolite | Na(AlSi3O8) |
| 9.FA.50 | Slawsonite | Sr(Al2Si2O8) |
| 9.FA.55 | Lisetite | CaNa2Al4Si4O16 |
| 9.FA.60 | Stronalsite | Na2SrAl4Si4O16 |
| 9.FA.60 | Banalsite | Na2BaAl4Si4O16 |
| 9.FA.65 | Maleevite | BaB2Si2O8 |
| 9.FA.65 | Pekovite | SrB2Si2O8 |
| 9.FA.65 | Danburite | CaB2Si2O8 |
| 9.FA.70 | Liebermannite | KAlSi3O8 |
| 9.FA.70 | Lingunite | NaAlSi3O8 |
| 9.FA.70 | Stöfflerite | CaAl2Si2O8 |
| 9.FA.75 | Pfaffenbergite | KNa3(Al4Si12)O32 |
| 9.FA.75 | Kokchetavite | K(AlSi3O8) |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Rubicline
mindat.org URL:
https://www.mindat.org/min-7276.html
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References for Rubicline
Reference List:
Teertstra, David K., Cerny, Petr, Hawthorne, Frank C., Pier, Julie, Wang, Lu-Min, Ewing, Rodney C. (1998) Rubicline, a new feldspar from San Piero in Campo, Elba, Italy. American Mineralogist, 83 (11) 1335-1339 doi:10.2138/am-1998-11-1223
Localities for Rubicline
Showing 9 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Australia | |
| Aylmore et al. (2018) |
Canada | |
| Teertstra et al. (1998) |
| Cerny et al. 2012 +1 other reference |
| Teertstra et al. (1998) |
Finland | |
| Teertstra et al. (1998) +1 other reference |
Italy (TL) | |
| Teertstra et al. (1998) |
Mozambique | |
| Teertstra et al. (1999) |
Russia | |
| Tony Nikischer (Excalibur Mineral Co.) +2 other references |
Sweden | |
| Bortolozzi (n.d.) |
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Vasin-Myl'k Mt, Voron'i Tundry, Murmansk Oblast, Russia