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NaCl · 2H2O
colorless to white
Crystal System:
As a hydrate of halite.
Often found in fluid inclusions.
Melts under its own vapor pressure at –0.1 °C, converting to halite.

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Classification of HydrohaliteHide

Approved, 'Grandfathered' (first described prior to 1959)

B : Simple halides, with H2O
A : M:X = 1:1 and 2:3

1 : AX

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

Physical Properties of HydrohaliteHide

colorless to white

Optical Data of HydrohaliteHide

moderately strong

Chemical Properties of HydrohaliteHide

NaCl · 2H2O

Crystallography of HydrohaliteHide

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Cell Parameters:
a = 6.3313(3) Å, b = 10.1178(9) Å, c = 6.5029(6) Å
β = 114.407(7)°
a:b:c = 0.626 : 1 : 0.643
Unit Cell V:
379.34 ų (Calculated from Unit Cell)
Space group probable - synthetic

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0009517HydrohaliteKlewe B, Pedersen B (1974) The crystal structure of sodium chloride dihydrate Acta Crystallographica B30 2363-23711974synthetic0293
CIF Raw Data - click here to close

Geological EnvironmentHide

Geological Setting:
Fluid inclusions

Type Occurrence of HydrohaliteHide

Synonyms of HydrohaliteHide

Other Language Names for HydrohaliteHide

Simplified Chinese:水石盐
Traditional Chinese:水石鹽

Related Minerals - Nickel-Strunz GroupingHide

3.BA.10CarnalliteKMgCl3 · 6H2OOrth. mmm (2/m 2/m 2/m) : Pnna

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

8.1.1GriceiteLiFIso. m3m (4/m 3 2/m) : Fm3m
8.1.2VilliaumiteNaFIso. m3m (4/m 3 2/m) : Fd3m
8.1.3HaliteNaClIso. m3m (4/m 3 2/m) : Fm3m
8.1.5CarobbiiteKFIso. m3m (4/m 3 2/m)
8.1.6SylviteKClIso. m3m (4/m 3 2/m) : Fm3m
8.1.7SalammoniacNH4ClIso. 4 3 2

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 HydrohaliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 HydrohaliteHide

Localities for HydrohaliteHide

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.
  • Eastern Antarctica
    • Victoria Land
      • Wright Valley
Antarctic Science 9(1):92-99 (1997)
Austria (TL)
  • Salzburg
    • Hallein District
      • Hallein
Hausmann (1847); C. Hintze: Handbuch der Mineralogie, Vol. 1, p. 2231 (1911); Dana, 7th ed. (1944), v.2, 15. Acta Cryst. B30 (1974), 2363.
  • Saskatchewan
Greengrass, K., Last, W. M., Deleqiat, J., & Suklmn, S. (1999). Waldsea lake Revisited: Another look at the Recent History of One of Western Canada's Best-studied Meromictic lakes.
  • Antofagasta
Aguilera, F., Layana, S., Rodríguez-Díaz, A., González, C., Cortés, J., & Inostroza, M. (2016). Alteración hidrotermal, depósitos fumarólicos y fluidos del Complejo Volcánico Lastarria: Un estudio multidsciplinario. Andean geology, 43(2), 166-196.
Kezao Chen (1992): Quaternary Sciences 3(8), 193-202
  • Qinghai
    • Haixi Mongol and Tibetan Autonomous Prefecture
      • Golmud City (Ge'ermu Co.)
        • Qarhan salt lake (Chaerhan salt lake)
Shaoxiu Yang (1991): Journal of Lake Sciences 3(1), 1-10
      • Mangnai City (Mangya Co.)
        • Lenghu Co.
Mianping Zheng and Xifang Liu (2010): Acta Geologica Sinica 84(11), 1585-1600
  • Tibet
    • Nagchu Prefecture (Naqu Prefecture)
      • Nyima Co. (Nima Co.)
Shaoxiu Yang (1991): Journal of Lake Sciences 3(1), 1-10
Shaoxiu Yang (1991): Journal of Lake Sciences 3(1), 1-10
Shaoxiu Yang (1991): Journal of Lake Sciences 3(1), 1-10
      • Shuanghu Co.
Shaoxiu Yang (1991): Journal of Lake Sciences 3(1), 1-10
Shaoxiu Yang (1991): Journal of Lake Sciences 3(1), 1-10
    • Ngari
      • Gê'gyai Co. (Geji Co.)
Shaoxiu Yang (1991): Journal of Lake Sciences 3(1), 1-10
Kezao Chen (1992): Quaternary Sciences 3(8), 193-202
  • Baden-Württemberg
    • Freiburg Region
      • Ortenaukreis
        • Oberwolfach
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.
  • Agder
    • Farsund
Konnerup-Madsen. J. (1979): Fluid inclusions in quartz from deep-seated granitic intrusions, south Norway. Lithos 12,13-23; Neumann, H. (1985): Norges Mineraler. Norges geologiske Undersøkelse Skrifter 68, p. 48
  • 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
  • Harghita
    • Ditrău (Ditró)
Heléna Walter, Elemér Pál-Molnár, Krisztián Fintor, Luca Kiri (2018) Fluid inclusions in post-magmatic diopsides of Jolotca ore field (Ditrău Alkaline Massif). XXI International Congress of the CBGA, Salzburg, Austria, September 10–13, 2018, Abstracts. p183
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