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Hydrohalite

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Formula:
NaCl · 2H2O
Colour:
colorless to white
Crystal 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.


Hide all sections | Show all sections

Classification of HydrohaliteHide

Approved, 'Grandfathered' (first described prior to 1959)
3.BA.05

3 : HALIDES
B : Simple halides, with H2O
A : M:X = 1:1 and 2:3
9.1.2.1

9 : NORMAL HALIDES
1 : AX
8.1.4

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

Physical Properties of HydrohaliteHide

Transparency:
Transparent
Colour:
colorless to white

Optical Data of HydrohaliteHide

Type:
Biaxial
Type:
Anisotropic
Anisotropism:
moderately strong

Chemical Properties of HydrohaliteHide

Formula:
NaCl · 2H2O

Crystallography of HydrohaliteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 6.3313(3) Å, b = 10.1178(9) Å, c = 6.5029(6) Å
β = 114.407(7)°
Ratio:
a:b:c = 0.626 : 1 : 0.643
Unit Cell V:
379.34 ų (Calculated from Unit Cell)
Z:
4
Comment:
Space group probable - synthetic

Type Occurrence of HydrohaliteHide

Synonyms of HydrohaliteHide

Other Language Names for HydrohaliteHide

German:Hydrohalit
Simplified Chinese:水石盐
Spanish:Hydrohalita
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.
Antarctica
 
  • Eastern Antarctica
    • Victoria Land
      • Wright Valley
Antarctic Science 9(1):92-99 (1997)
Austria (TL)
 
  • 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.
Canada
 
  • 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.
China
 
Kezao Chen (1992): Quaternary Sciences 3(8), 193-202
  • Qinghai
    • Haixi
      • Golmud Co. (Ge'ermu Co.)
        • Qarhan salt lake (Chaerhan salt lake)
Shaoxiu Yang (1991): Journal of Lake Sciences 3(1), 1-10
      • 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
Germany
 
  • Baden-Württemberg
    • Ortenaukreis
      • 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
    • 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
Romania
 
  • 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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