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Chloromagnesite

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Formula:
MgCl2
System:
Hexagonal
Colour:
Colourless, white
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.

Classification of Chloromagnesite

Questionable/Doubtful
3.AB.20

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

9 : NORMAL HALIDES
2 : AX2
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First Recorded Occurrence of Chloromagnesite

Associated Minerals at First Recorded Locality:

Physical Properties of Chloromagnesite

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

Crystallography of Chloromagnesite

Crystal System:
Hexagonal
Morphology:
Sublimate.

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.
Surface Relief:
Moderate

Chemical Properties of Chloromagnesite

Formula:
MgCl2
Essential elements:
All elements listed in formula:
Analytical Data:
Deliquescent. Very soluble in water.

Relationship of Chloromagnesite to other Species

Other Members of Group:
Lawrencite(Fe2+,Ni)Cl2
ScacchiteMnCl2
TolbachiteCuCl2
3.AB.FluorocronitePbF2
3.AB.05TolbachiteCuCl2
3.AB.10CocciniteHgI2
3.AB.15SellaiteMgF2
3.AB.20Lawrencite(Fe2+,Ni)Cl2
3.AB.20ScacchiteMnCl2
3.AB.25FluoriteCaF2
3.AB.25FrankdicksoniteBaF2
3.AB.25StrontiofluoriteSrF2
3.AB.30Tveitite-(Y)(Y, Na)6Ca6Ca6F42
3.AB.35Gagarinite-(Y)NaCaYF6
3.AB.35Gagarinite-(Ce)Na(REExCa1-x)(REEyCa1-y)F6
3.AB.35Polezhaevaite-(Ce)NaSrCeF6

Other Names for Chloromagnesite

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.

References for Chloromagnesite

Reference List:
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 Chloromagnesite

Localities for Chloromagnesite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Italy (FRL)
 
  • 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.
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.
      • Death Valley National Park
        • Death Valley
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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