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Chloromagnesite

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Formula:
MgCl2
Colour:
Colourless, white
Specific Gravity:
2.325
Crystal System:
Hexagonal
Name:
In allusion to the composition, containing CHLORine and MAGNESium.
Isostructural with:
Lawrencite Group.

A doubtful species. Natural magnesium chloride is regarded as very unlikely.


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Classification of ChloromagnesiteHide

Approved, 'Grandfathered' (first described prior to 1959), Questionable
3.AB.20

3 : HALIDES
A : Simple halides, without H2O
B : M:X = 1:2
9.2.3.3

9 : NORMAL HALIDES
2 : AX2

Physical Properties of ChloromagnesiteHide

Colour:
Colourless, white
Density:
2.325 g/cm3 (Measured)    2.44 g/cm3 (Calculated)

Optical Data of ChloromagnesiteHide

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.
Surface Relief:
Moderate

Chemical Properties of ChloromagnesiteHide

Formula:
MgCl2

Crystallography of ChloromagnesiteHide

Crystal System:
Hexagonal
Morphology:
Sublimate.

Type Occurrence of ChloromagnesiteHide

Synonyms of ChloromagnesiteHide

Other Language Names for ChloromagnesiteHide

Relationship of Chloromagnesite to other SpeciesHide

Other Members of this group:
Lawrencite(Fe2+,Ni)Cl2Trig. 3m (3 2/m) : R3m
ScacchiteMnCl2Trig. 3m (3 2/m) : R3m
TolbachiteCuCl2Mon.

Related Minerals - Nickel-Strunz GroupingHide

3.AB.FluorocronitePbF2Iso. m3m (4/m 3 2/m) : Fm3m
3.AB.05TolbachiteCuCl2Mon.
3.AB.10CocciniteHgI2Tet.
3.AB.15SellaiteMgF2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
3.AB.20Lawrencite(Fe2+,Ni)Cl2Trig. 3m (3 2/m) : R3m
3.AB.20ScacchiteMnCl2Trig. 3m (3 2/m) : R3m
3.AB.25FluoriteCaF2Iso. m3m (4/m 3 2/m) : Fm3m
3.AB.25FrankdicksoniteBaF2Iso. m3m (4/m 3 2/m) : Fm3m
3.AB.25StrontiofluoriteSrF2Iso. m3m (4/m 3 2/m) : Fm3m
3.AB.30Tveitite-(Y)(Y, Na)6Ca6Ca6F42Trig. 3 : R3
3.AB.35Gagarinite-(Y)NaCaYF6Hex. 6/m : P63/m
3.AB.35Gagarinite-(Ce)Na(REExCa1-x)(REEyCa1-y)F6Trig.
3.AB.35Polezhaevaite-(Ce)NaSrCeF6Hex. 6/m : P63/m

Related Minerals - Dana Grouping (8th Ed.)Hide

9.2.3.1Lawrencite(Fe2+,Ni)Cl2Trig. 3m (3 2/m) : R3m
9.2.3.2ScacchiteMnCl2Trig. 3m (3 2/m) : R3m

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for ChloromagnesiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Monticelli and Covelli (1925) (as Magnesia muriata).
Scacchi (1855) Mem. Incend. Vesuv.: 181 (as Cloruro di Magnesio).
Scacchi (1875) Acc. Napoli, Att.: 6, no. 9, 43.
Hüttig (1921) Zeitschrift für anorganische und allgemeine Chemie, Hamburg, Leipzig: 115: 251.
Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 57.
Pauling (1929) Proceedings of the National Academy of Science, Washington: 15: 709.
Palache, Charles, Harry Berman & Clifford Frondel (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 41.

Internet Links for ChloromagnesiteHide

Localities for ChloromagnesiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Italy (TL)
 
  • Campania
    • Naples Province
      • Somma-Vesuvius Complex
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 41.
Poland
 
  • Upper Silesia (Śląskie)
    • Upper Silesian Coal Basin
      • Rybnik Coal Area
        • Radlin
Łukasz Kruszewski (2012) Unique chloride assemblage of exhalative origin from burning coal-mining dump in Radlin (Rybnik Coal Area, S Poland). Mineralogical Society of Poland Special Papers 40
Russia
 
  • Eastern-Siberian Region
    • Sakha Republic (Saha Republic; Yakutia)
      • Daldyn-Alakit kimberlite field
        • Daldyn
Sharygin, I. S., Golovin, A. V., Korsakov, A. V., & Pokhilenko, N. P. (2013). Eitelite in sheared peridotite xenoliths from Udachnaya-East kimberlite pipe (Russia)–a new locality and host rock type. European Journal of Mineralogy, 25(5), 825-834.
USA
 
  • California
    • San Bernardino Co.
      • Ibex Hills
Bailey, Gilbert E. (1902), The saline deposits of California: California Mining Bureau Bulletin 24: 106; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 137.
  • Virginia
Minerals of Virginia, 1990 by R. V. Dietrich
Mineral and/or Locality  
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