Korshunovskite
A valid IMA mineral species
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About Korshunovskite
Formula:
Mg2Cl(OH)3 · 4H2O
Colour:
Colorless
Hardness:
2
Specific Gravity:
1.798
Crystal System:
Triclinic
Name:
Named for the Korshunovskoye iron deposit, Russia, the type locality.
This page provides mineralogical data about Korshunovskite.
Unique Identifiers
Mindat ID:
2256
Long-form identifier:
mindat:1:1:2256:5
IMA Classification of Korshunovskite
Approved
IMA Formula:
Mg2Cl(OH)3(H2O)3·H2O
Approval year:
1980
First published:
1982
Classification of Korshunovskite
3.BD.15
3 : HALIDES
B : Simple halides, with H2O
D : Simple halides with H2O and additional OH
3 : HALIDES
B : Simple halides, with H2O
D : Simple halides with H2O and additional OH
10.1.5.1
10 : OXYHALIDES AND HYDROXYHALIDES
1 : A2(O,OH)3Xq
10 : OXYHALIDES AND HYDROXYHALIDES
1 : A2(O,OH)3Xq
8.4.4
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
4 : Halides of the alkaline earths and Mg
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
4 : Halides of the alkaline earths and Mg
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 |
|---|---|---|
| Kss | 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 Korshunovskite
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
2 on Mohs scale
Density:
1.798(2) g/cm3 (Measured) 1.787 g/cm3 (Calculated)
Optical Data of Korshunovskite
Type:
Biaxial (-)
RI values:
nα = 1.516(1) nβ = 1.538(1) nγ = 1.547(1)
2V:
Measured: 62° , Calculated: 64°
Max. Birefringence:
δ = 0.031
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:
None to Very Low
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
none
Chemistry of Korshunovskite
Mindat Formula:
Mg2Cl(OH)3 · 4H2O
Element Weights:
Elements listed:
Crystallography of Korshunovskite
Crystal System:
Triclinic
Cell Parameters:
a = 8.64(3) Å, b = 6.25(1) Å, c = 7.42(1) Å
α = 101.4(3)°, β = 103.9(1)°, γ = 72.7(6)°
α = 101.4(3)°, β = 103.9(1)°, γ = 72.7(6)°
Ratio:
a:b:c = 1.382 : 1 : 1.187
Unit Cell V:
367.89 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Elongated prismatic
Comment:
Triclinic. Point Group: n.d.; Space Group: n.d.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
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) |
|---|---|---|---|---|---|---|---|
| 0009151 | Korshunovskite | de Wolff P M, Walter-Levy L (1953) The crystal structure of Mg2(OH)3(Cl,Br)*4H2O Acta Crystallographica 6 40-44 |  | 1953 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.04 Å | (100) |
| 4.032 Å | (70) |
| 3.843 Å | (70-80) |
| 2.873 Å | (60b) |
| 2.703 Å | (60) |
| 2.439 Å | (90-100) |
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) |
Type Occurrence of Korshunovskite
General Appearance of Type Material:
Elongated prismatic grains, tenths of a mm long, in veinlets 1-2 mm wide, in dolomitic marble.
Place of Conservation of Type Material:
Fersman Mineralogical Museum, Moscow, Russia.
Geological Setting of Type Material:
Iron ore deposit.
Associated Minerals at Type Locality:
Synonyms of Korshunovskite
Other Language Names for Korshunovskite
Related Minerals - Strunz-mindat Grouping
| 3.BD.05 | Cadwaladerite | Al5(H2O)3(OH)12 · n(Cl,H2O) |
| 3.BD.20 | Nepskoeite | Mg4Cl(OH)7 · 6H2O |
| 3.BD.25 | Koenenite | Na4Mg9Al4Cl12(OH)22 |
Other Information
Thermal Behaviour:
Weak endothermic effect at 87° and a strong one at 198° (total loss of weight 23.88%), a weak one at 383° and a strong one at 447°C. At 1000° the residue is MgO.
Notes:
Slowly soluble in water, readily soluble in weak acids.
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 Korshunovskite
mindat.org URL:
https://www.mindat.org/min-2256.html
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Please feel free to link to this page.
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References for Korshunovskite
Localities for Korshunovskite
Showing 3 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.
Canada | |
| Shang (2000) |
Poland | |
| Kruszewski (2012) |
Russia (TL) | |
| Malinko et al. (1982) +2 other references |
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Korshunovskoye iron deposit, Zheleznogorsk-Ilimsky, Nizhneilimsky District, Irkutsk Oblast, Russia