Karasugite
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
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
GUID
(UUID V4):
(UUID V4):
39aea2d0-6d4a-4d4a-95e0-f69c89a4a34f
IMA Classification of Karasugite
Approved
IMA Formula:
SrCaAlF7
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 |
---|---|---|
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 = 1.424(5) nβ = 1.432(5) nγ = 1.442(5)
2V:
Measured: 94° to 94.5°, Calculated: 86°
Max Birefringence:
δ = 0.018
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
not discernible
Comments:
Y = b, X:c ≈ 7°
Chemistry of Karasugite
Mindat Formula:
SrCa[Al(F,OH)7]
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:
Reference:
Petersen, O.V., Khomyakov, A.P., Leonardsen, E.S., Micheelsen, H.I., Johnsen, O. (1994) Karasugite, SrCaAl[F,(OH)]7 a new mineral from the Karasug Fe-REE-barite-fluorite deposit, Tannu-Ola Range, South Siberia, Russia. Neues Jahrbuch für Mineralogie, Monatshefte: 209-216.
Synonyms of Karasugite
Other Language Names for Karasugite
German:Karasugit
Spanish:Karasugita
Related Minerals - Strunz-mindat Grouping
3.CB.05 | Cryolithionite | Na3Al2(LiF4)3 |
3.CB.15 | Cryolite | Na2NaAlF6 |
3.CB.15 | Elpasolite | K2NaAlF6 |
3.CB.15 | Simmonsite | Na2LiAlF6 |
3.CB.20 | Colquiriite | CaLi[AlF6] |
3.CB.25 | Weberite | Na2Mg[AlF6]F |
3.CB.25 | Leonardsenite | MgAlF5 · 2H2O |
3.CB.35 | Usovite | Ba2CaMgAl2F14 |
3.CB.40 | Pachnolite | NaCa[AlF6] · H2O |
3.CB.40 | Thomsenolite | 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
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Karasugite
Reference List:
Localities for Karasugite
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Russia (TL) | |
|
Quick NavTopUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesStrunz-MindatOther InformationInternet Links References Localities Locality List