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Chloromagnesite

Formula:
MgCl
 
2
System:HexagonalColour:Colourless, white
Name:In allusion to the composition, containing CHLORine and MAGNESium.
Isostructural with:Lawrencite, Scacchite


Lawrencite Group.

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

Classification of Chloromagnesite

IMA status:Questionable/Doubtful
Strunz 8th edition ID:3/A.07-05
Nickel-Strunz 10th (pending) edition ID:3.AB.20

3 : HALIDES
A : Simple halides, without H2O
B : M:X = 1:2
Dana 8th edition ID:9.2.3.3

9 : NORMAL HALIDES
2 : AX2
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Type Occurrence of Chloromagnesite

Type Locality:Mt. Vesuvius, Somma-Vesuvius Complex, Naples Province, Campania, Italy
Associated Minerals at type locality:
SylviteHalite

Physical Properties of Chloromagnesite

Colour:Colourless, white
Density (measured):2.325 g/cm3
Density (calculated):2.44 g/cm3

Crystallography of Chloromagnesite

Crystal System:Hexagonal
Morphology:Sublimate.

Optical Data of Chloromagnesite

Type:Uniaxial (-)
RI values: nω = 1.675 nε = 1.590
Maximum Birefringence:δ = 0.085

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate

Chemical Properties of Chloromagnesite

Formula:
MgCl
 
2
Essential elements:Cl, Mg
All elements listed in formula:Cl, Mg
Analytical Data:Deliquescent. Very soluble in water.
Relationship of Chloromagnesite to other Species
Member of Group:
Lawrencite Group:
AX
 
2
 where A = Fe, Mn, Mg, Cu and X = Cl
Related Minerals - Nickel-Strunz Grouping):

- + 
3.AB.05Tolbachite
CuCl
 
2
3.AB.10Coccinite
HgI
 
2
3.AB.15Sellaite
MgF
 
2
3.AB.20Lawrencite
(Fe
2+
 
,Ni)Cl
 
2
3.AB.20Scacchite
MnCl
 
2
3.AB.25Fluorite
CaF
 
2
3.AB.25Frankdicksonite
BaF
 
2
3.AB.25IMA2009-014
SrF
 
2
3.AB.30Tveitite-(Y)
(Y, Na)
 
6
Ca
 
6
Ca
 
6
F
 
42
3.AB.35Gagarinite-(Y)
NaCaY(F,Cl)
 
6
3.AB.35Zajacite-(Ce)
Na(REE
 
x
Ca
 
1-x
)(REE
 
y
Ca
 
1-y
)F
 
6
3.AB.35IMA2009-015
NaSrCeF
 
6
Other Names for Chloromagnesite
Synonyms:
Cloromagnesite
Other Languages:
German:Chloromagnesit
Cloromagnesit
Italian:Cloruro di Magnesio
Magnesia muriata
Russian:Хлоромагнезит
Spanish:Chloromagnesita
Cloromagnesita
Other Information
Health Warning: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.


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    Localities for Chloromagnesite
    






    


    

    
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    (TL) indicates type locality.  ? 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
     
    

    • 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.
    USA
     
    

    • Virginia
    
    		Minerals of Virginia, 1990 by R. V. Dietrich
    

    


    

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