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Hydrohalite

Formula:
NaCl·2H
 
2
O
System:Monoclinic
Name:As a hydrate of halite.


Often found in fluid inclusions.
Melts under its own vapor pressure at –0.1 C, converting to halite.

Classification of Hydrohalite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:3/A.12-10
Nickel-Strunz 10th (pending) edition ID:3.BA.05

3 : HALIDES
B : Simple halides, with H2O
A : M:X = 1:1 and 2:3
Dana 8th edition ID:9.1.2.1

9 : NORMAL HALIDES
1 : AX
Hey's CIM Ref.:8.1.4

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
1 : Halides of the alkali metals and ammonium
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Type Occurrence of Hydrohalite

Type Locality:Rock salt deposit, Dürrnberg, Hallein, Salzburg, Austria
Year of Discovery:1847

Crystallography of Hydrohalite

Crystal System:Monoclinic

Chemical Properties of Hydrohalite

Formula:
NaCl·2H
 
2
O
Essential elements:Cl, H, Na, O
All elements listed in formula:Cl, H, Na, O

Relationship of Hydrohalite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
3.BA.10Carnallite
KMgCl
 
3
·6H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
8.1.1Griceite
LiF
8.1.2Villiaumite
NaF
8.1.3Halite
NaCl
8.1.5Carobbiite
KF
8.1.6Sylvite
KCl
8.1.7Salammoniac
NH
 
4
Cl

Other Names for Hydrohalite

Synonyms:
BihydrateNatriumchloridhydrat
Other Languages:
German:Hydrohalit
Russian:Гидрогалит
Spanish:Hydrohalita

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 Hydrohalite

Reference List:Hausmann (1847): 1458.

Quenstedt (1877): 623.

Poljenov (1909) Jb. Min.: II: 12.

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: 15.

Acta Crystallographica: B30: 2363-2371.

Internet Links for Hydrohalite

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  • Raman and XRD data at RRUFF project
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  • Hydrohalite details from Handbook of Mineralogy (PDF)
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    Localities for Hydrohalite

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    The 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. ? 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.
    Antarctica
     
    • Eastern Antarctica
      • Victoria Land
        • Wright Valley
    		Antarctic Science 9(1):92-99 (1997)
    Austria
     
    • Salzburg
      • Hallein
        • Dürrnberg
    		Hausmann (1847); C. Hintze: Handbuch der Mineralogie, Vol. 1, p. 2231 (1911); Dana, 7th ed. (1944), v.2, 15. Acta Cryst. B30 (1974), 2363.
    Germany
     
    • Baden-Württemberg
      • Black Forest
        • Wolfach
          • Oberwolfach
            • Rankach valley
    		Pfaff, K., Romer, R. L. & Markl, G. (2009): U-Pb ages of ferberite, chalcedony, agate, \'U-mica\' and pitchblende: constraints on the mineralization history of the Schwarzwald ore district. European Journal of Mineralogy 21, 817-836.
    Norway
     
    • Buskerud
      • Øvre Eiker
        • Gunhildrud
    		Jahren, J.; Berg, H.J.; Hurum, J.H. & Wulff-Pedersen, E. (1998): Nye undersøkelser av amazonitt-genthelvin pegmatitten fra Fiskum, Øvre Eiker. Bergverksmuseets Skrift 14, 13-16
    • Vest-Agder
    		Konnerup-Madsen (1979, pp. 15-16); Neumann (1985, pp. 48-49).
    Mineral and/or Locality
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