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Tachyhydrite

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Formula:
CaMg2Cl6 · 12H2O
Colour:
Colourless, light yellow
Lustre:
Vitreous
Hardness:
2
Specific Gravity:
1.667
Crystal System:
Trigonal
Name:
From Greek ταχίς quick, and ϋδωρ, water, alluding to its ready deliquescence.
A very hygroscopic hydrated chloride mineral.


Hide all sections | Show all sections

Classification of TachyhydriteHide

Approved, 'Grandfathered' (first described prior to 1959)
3.BB.35

3 : HALIDES
B : Simple halides, with H2O
B : M:X = 1:2
11.5.5.1

11 : HALIDE COMPLEXES
5 : AmBX6
8.4.6

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
4 : Halides of the alkaline earths and Mg

Physical Properties of TachyhydriteHide

Vitreous
Transparency:
Transparent
Colour:
Colourless, light yellow
Hardness:
Cleavage:
Perfect
On {10_11}.
Density:
1.667 g/cm3 (Measured)    

Optical Data of TachyhydriteHide

Type:
Uniaxial (-)
RI values:
nω = 1.520 nε = 1.512
Max Birefringence:
δ = 0.008
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Pleochroism:
Non-pleochroic
Comments:
Not dichroic.

Chemical Properties of TachyhydriteHide

Formula:
CaMg2Cl6 · 12H2O

Crystallography of TachyhydriteHide

Crystal System:
Trigonal
Morphology:
Massive; in rounded masses. Crystals rhombohedral with {0001} (artificial crystals).
Twinning:
Exhibits twin lamellae at times; probably secondary and due to pressure.

Type Occurrence of TachyhydriteHide

Geological Setting of Type Material:
Oceanic-type, potash-rich saline deposit.
Associated Minerals at Type Locality:

Other Language Names for TachyhydriteHide

Common AssociatesHide

AnhydriteCaSO4
BischofiteMgCl2 · 6H2O
CarnalliteKMgCl3 · 6H2O
HaliteNaCl
KainiteKMg(SO4)Cl · 3H2O
KieseriteMgSO4 · H2O
SylviteKCl
Associated Minerals Based on Photo Data:
Carnallite2 photos of Tachyhydrite associated with Carnallite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

3.BB.05EriochalciteCuCl2 · 2H2OOrth. mmm (2/m 2/m 2/m)
3.BB.10RokühniteFeCl2 · 2H2OMon.
3.BB.15BischofiteMgCl2 · 6H2OMon. 2/m : B2/m
3.BB.20NickelbischofiteNiCl2 · 6H2OMon.
3.BB.25SinjariteCaCl2 · 2H2OTet.
3.BB.30AntarcticiteCaCl2 · 6H2OTrig. 3 2 : P3 2 1

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

8.4.1SellaiteMgF2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
8.4.2NeighboriteNaMgF3Orth. mmm (2/m 2/m 2/m)
8.4.3BischofiteMgCl2 · 6H2OMon. 2/m : B2/m
8.4.4KorshunovskiteMg2Cl(OH)3 · 4H2OTric.
8.4.5CarnalliteKMgCl3 · 6H2OOrth. mmm (2/m 2/m 2/m) : Pnna
8.4.7FluoriteCaF2Iso. m3m (4/m 3 2/m) : Fm3m
8.4.8SinjariteCaCl2 · 2H2OTet.
8.4.9AntarcticiteCaCl2 · 6H2OTrig. 3 2 : P3 2 1
8.4.10ChlorocalciteKCaCl3Orth. mmm (2/m 2/m 2/m) : Pnma
8.4.11RorisiteCaFClTet.
8.4.12JarliteNa(Sr,Na)7MgAl6F32(OH,H2O)2Mon. 2/m
8.4.13CalcjarliteNa(Ca,Sr)3Al3(OH)2F14Mon.
8.4.14TikhonenkoviteSr[AlF4(OH)(H2O)]Mon. 2/m : P21/b
8.4.15AcuminiteSr[AlF4(OH)(H2O)]Mon. 2/m : B2/b
8.4.16FrankdicksoniteBaF2Iso. m3m (4/m 3 2/m) : Fm3m
8.4.17UsoviteBa2CaMgAl2F14Mon.
8.4.18BøgvaditeNa2SrBa2Al4F20Mon. 2/m

Other InformationHide

Notes:
Readily soluble in water.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Industrial Uses:
Source of potassium.

References for TachyhydriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Rammelsberg (1856) Annalen der Physik, Halle, Leipzig: 98: 261.
Des Cloizeaux, A. (1867) Nouvelles recherches sur les propriétés optique des cristaux, naturels ou artificiels, et sur les variations que ces propriétés éprouvent sous l’influence de la chaleur. 222pp., Paris. (Institut imperial de France, Mémoires 18): 74.
Groth, P. (1874) Tabellarische Übersicht der Mineralien nach ihren krystallographish-chemischen Beziehungen. Braunschweig. 1st. edition: 74.
de Schulten (1890) Comptes rendus de l’Académie des sciences de Paris: 111: 928.
Boeke (1908) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 45: 354.
Kling (1915) Centralblatt für Mineralogie, Geologie und Paleontologie, Stuttgart: 14, 44.
Jung (1926) Centralblatt für Mineralogie, Geologie und Paleontologie, Stuttgart: 274.
Doelter, C. (1928) Handbuch der Mineral-chemie (in 4 volumes divided into parts): 4[2]: 1219.
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: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 95-96.
Acta Crystallographica (1980): B36: 2736-2739.

Internet Links for TachyhydriteHide

Localities for TachyhydriteHide

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.
Austria
 
  • Salzburg
    • Hallein
      • Dürrnberg
A. Strasser: Die Minerale Salzburgs, 1989
Brazil
 
  • Sergipe
    • Rosário do Catete
http://www.cetem.gov.br/publicacao/CTs/CT2002-158-00.pdf
Germany
 
  • Lower Saxony
    • Celle
      • Hänigsen
Bode "Mineralien und Fundstellen BRD" from 1989 ISBN 3-925094-24-5 Pg.9
      • Wathlingen
Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
    • Göttingen
      • Reyershausen
Niemann, H. (1960): Contributions to Mineralogy and Petrology 7, 137-165.
    • Nordhorn
      • Frenswegen
Füchtbauer, H., and Goldschmidt, H. (1956): Contributions to Mineralogy and Petrology 5(3), 187-203.
    • Peine
Dana 6: Appendix 3: 40; 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: 91.
    • Vienenburg
Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
  • Saxony-Anhalt
    • Halle
      • Teutschenthal
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: 95.
    • Stassfurt Potash deposit
      • Egeln
        • Tarthun
No reference listed
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: 95; Wittern: "Mineralfundorte in Deutschland", 2001
Poland
 
  • Wielkopolskie
Wachowiak, J., Pieczka, A. (2016): Motukoreaite from the Kłodawa Salt Dome, Central Poland. Mineralogical Magazine, 80, 277-289
Republic of Congo (Brazzaville)
 
  • Kouilou Department
Henry Rauche (2009) Updated Reserve and Resource Estimate for MagMinerals Kouilou Potash Project, Republic of Congo
Thailand
 
  • Maha Sarakham Province
Tabakh, M. E., Schreiber, B. C., Utha‐Aroon, C., Coshell, L., & Warren, J. K. (1998). Diagenetic origin of basal anhydrite in the Cretaceous Maha Sarakham salt: Khorat Plateau, NE Thailand. Sedimentology, 45(3), 579-594.
UK
 
  • England
    • Co. Durham
      • Billingham
Mineralogical Magazine 1959 32 : 172-175.
USA
 
  • New Mexico
    • Eddy and Lea Counties
Northrop, Minerals of New Mexico, 3rd. rev. ed. (1996)
Mineral and/or Locality  
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