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Hydrohalite

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Formula:
NaCl · 2H2O
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

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
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
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First Recorded Occurrence of Hydrohalite

Year of Discovery:
1847

Crystallography of Hydrohalite

Crystal System:
Monoclinic

Chemical Properties of Hydrohalite

Formula:
NaCl · 2H2O
Essential elements:
All elements listed in formula:

Relationship of Hydrohalite to other Species

Other Names for Hydrohalite

Name in Other Languages:
German:Hydrohalit
Simplified Chinese:水石盐
Spanish:Hydrohalita
Traditional Chinese:水石鹽

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 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

Localities for Hydrohalite

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.
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.
China
 
Kezao Chen (1992): Quaternary Sciences 3(8), 193-202
  • Qinghai Province
    • Haixi Autonomous Prefecture
      • 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 Autonomous Region
    • 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 Prefecture
      • 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
    • 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
    • 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
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