Chloromagnesite
A valid IMA mineral species - grandfathered - questionable
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Formula:
MgCl2
Colour:
Colourless, white
Specific Gravity:
2.325
Crystal System:
Trigonal
Member of:
Name:
In allusion to the composition, containing CHLORine and MAGNESium.
Isostructural with:
Unique Identifiers
Mindat ID:
1022
Long-form identifier:
mindat:1:1:1022:7
GUID
(UUID V4):
(UUID V4):
5b509943-fd62-4c05-9f59-06c0555b7e68
IMA Classification of Chloromagnesite
Approved, 'Grandfathered' (first described prior to 1959), Questionable
Classification of Chloromagnesite
3.AB.20
3 : HALIDES
A : Simple halides, without H2O
B : M:X = 1:2
3 : HALIDES
A : Simple halides, without H2O
B : M:X = 1:2
9.2.3.3
9 : NORMAL HALIDES
2 : AX2
9 : NORMAL HALIDES
2 : AX2
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 |
---|---|---|
Cmgs | 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 Chloromagnesite
Colour:
Colourless, white
Density:
2.325 g/cm3 (Measured) 2.44 g/cm3 (Calculated)
Optical Data of Chloromagnesite
Type:
Uniaxial (-)
RI values:
nω = 1.675 nε = 1.590
Max Birefringence:
δ = 0.085
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
Chemistry of Chloromagnesite
Mindat Formula:
MgCl2
Elements listed:
Crystallography of Chloromagnesite
Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
R3m
Setting:
R3 2/m
Cell Parameters:
a = 3.596 Å, c = 17.589 Å
Ratio:
a:c = 1 : 4.891
Unit Cell V:
196.98 ų (Calculated from Unit Cell)
Morphology:
Sublimate.
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) |
---|---|---|---|---|---|---|---|
0011808 | Chloromagnesite | Wyckoff R W G (1963) Second edition. Interscience Publishers, New York, New York Crystal Structures 1 239-444 | 1963 | 0 | 293 |
CIF Raw Data - click here to close
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
45b : [Other oxidized fumarolic minerals] | |
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
50 : Coal and/or oil shale minerals | <0.36 |
Stage 10b: Anthropogenic minerals | <10 Ka |
54 : Coal and other mine fire minerals (see also #51 and #56) |
Type Occurrence of Chloromagnesite
Associated Minerals at Type Locality:
Synonyms of Chloromagnesite
Other Language Names for Chloromagnesite
Relationship of Chloromagnesite to other Species
Member of:
Other Members of this group:
Lawrencite | (Fe2+,Ni)Cl2 | Trig. 3m (3 2/m) : R3m |
Scacchite | MnCl2 | Trig. 3m (3 2/m) : R3m |
Tolbachite | CuCl2 | Mon. 2/m : B2/m |
Related Minerals - Strunz-mindat Grouping
3.AB. | Fluorocronite | PbF2 |
3.AB. | Manuelarossiite | PbCaAlF7 |
3.AB.05 | Tolbachite | CuCl2 |
3.AB.10 | Coccinite | HgI2 |
3.AB.15 | Sellaite | MgF2 |
3.AB.20 | Lawrencite | (Fe2+,Ni)Cl2 |
3.AB.20 | Scacchite | MnCl2 |
3.AB.25 | Fluorite | CaF2 |
3.AB.25 | Frankdicksonite | BaF2 |
3.AB.25 | Strontiofluorite | SrF2 |
3.AB.30 | Tveitite-(Y) | (Y, Na)6Ca6Ca6(Ca,Na)F42 |
3.AB.35 | Gagarinite-(Y) | NaCaYF6 |
3.AB.35 | Gagarinite-(Ce) | Na(REExCa1-x)(REEyCa1-y)F6 |
3.AB.35 | Polezhaevaite-(Ce) | NaSrCeF6 |
3.AB.37 | Calcioaravaipaite | PbCa2AlF9 |
3.AB.85 | Cotunnite | PbCl2 |
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 Chloromagnesite
mindat.org URL:
https://www.mindat.org/min-1022.html
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References for Chloromagnesite
Localities for Chloromagnesite
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.
Italy (TL) | |
| Palache et al. (1951) |
Pelloux (1927) +2 other references | |
Poland | |
| Łukasz Kruszewski (2012) |
Russia | |
| Sharygin et al. (2013) |
USA | |
| Bailey (1902) +1 other reference |
| Dietrich (1990) |
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