Karasugite
A valid IMA mineral species
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Formula:
SrCa[Al(F,OH)7]
Colour:
colorless
Lustre:
Vitreous
Specific Gravity:
3.06 - 3.11
Crystal System:
Monoclinic
Name:
Named by O.V. Petersen, A.P. Khomyakov, E.S. Leonardsen, H.I. Micheelsen, and O. Johnsen in 1994 for the Karasug REE-Sr-Ba-Fe-fluorite deposit, Russia.
This page provides mineralogical data about Karasugite.
Unique Identifiers
Mindat ID:
2157
Long-form identifier:
mindat:1:1:2157:5
IMA Classification of Karasugite
Approved
IMA Formula:
SrCaAlF7
Approval year:
1993
First published:
1994
Classification of Karasugite
3.CB.30
3 : HALIDES
C : Complex halides
B : Neso-aluminofluorides
3 : HALIDES
C : Complex halides
B : Neso-aluminofluorides
11.6.21.1
11 : HALIDE COMPLEXES
6 : Aluminofluorides - Isolated Octahedra
11 : HALIDE COMPLEXES
6 : Aluminofluorides - Isolated Octahedra
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 |
|---|---|---|
| Krg | 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 Karasugite
Vitreous
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Tenacity:
Brittle
Cleavage:
Perfect
Cleavage or parting {100}
Cleavage or parting {100}
Fracture:
Splintery
Density:
3.06 - 3.11 g/cm3 (Measured) 3.206 g/cm3 (Calculated)
Optical Data of Karasugite
Type:
Biaxial (+)
RI values:
nα = 1.4240(5) nβ = 1.4320(5) nγ = 1.4415(5)
2V:
Measured: 94° to 94.5°, Calculated: 86°
Max. Birefringence:
δ = 0.018
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:
not discernible
Comments:
Y = b, X:c ≈ 7°
Chemistry of Karasugite
Mindat Formula:
SrCa[Al(F,OH)7]
Element Weights:
Common Impurities:
Na
Crystallography of Karasugite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 8.215(5) Å, b = 11.989(3) Å, c = 6.076(3) Å
β = 96.22(1)°
β = 96.22(1)°
Ratio:
a:b:c = 0.685 : 1 : 0.507
Unit Cell V:
594.90 ų (Calculated from Unit Cell)
Z:
4
Twinning:
(001) as composition and twin plane.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.76 Å | (7) |
| 4.25 Å | (10) |
| 3.64 Å | (8) |
| 3.15 Å | (7) |
| 3.06 Å | (8) |
| 3.03 Å | (7) |
| 2.125 Å | (8) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47g : [Halogen-bearing surface weathering minerals] |
Type Occurrence of Karasugite
General Appearance of Type Material:
Occurs as colorless rosettes to 1.5 x 1.5 x 1.0 mm, consisting of bladed crystals to 0.25 x 0.10 x 0.003 mm.
Place of Conservation of Type Material:
1) Geological Museum, Copenhagen, Denmark.
2) A. E. Fersman Mineralogical Museum, Moscow, Russia.
2) A. E. Fersman Mineralogical Museum, Moscow, Russia.
Geological Setting of Type Material:
Oxidation zone of an iron, REE, barite, and fluorite deposit.
Associated Minerals at Type Locality:
Synonyms of Karasugite
Other Language Names for Karasugite
Related Minerals - Strunz-mindat Grouping
| 3.CB.05 | Cryolithionite | Na3Al2(LiF4)3 |
| 3.CB.15 | Elpasolite | K2NaAlF6 |
| 3.CB.15 | Simmonsite | Na2LiAlF6 |
| 3.CB.15 | Cryolite | Na2NaAlF6 |
| 3.CB.20 | Colquiriite | CaLi[AlF6] |
| 3.CB.25 | Leonardsenite | MgAlF5 · 2H2O |
| 3.CB.25 | Weberite | Na2Mg[AlF6]F |
| 3.CB.35 | Usovite | Ba2CaMgAl2F14 |
| 3.CB.40 | Thomsenolite | NaCa[AlF6] · H2O |
| 3.CB.40 | Pachnolite | NaCa[AlF6] · H2O |
| 3.CB.45 | Carlhintzeite | Ca2[AlF6]F · H2O |
| 3.CB.50 | Yaroslavite | Ca3Al2F10(OH)2 · H2O |
| 3.CB.55 | Sbacchiite | Ca2AlF7 |
| 3.CB.60 | Verneite | Na2Ca3Al2F14 |
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 Karasugite
mindat.org URL:
https://www.mindat.org/min-2157.html
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Please feel free to link to this page.
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References for Karasugite
Reference List:
Localities for Karasugite
Showing 1 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.
Russia (TL) | |
| Petersen et al. (1994) +1 other reference |
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