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Tachyhydrite

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

Classification of Tachyhydrite

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

Year of Discovery:
1856
Geological Setting of First Recorded Material:
Oceanic-type, potash-rich saline deposit.
Associated Minerals at First Recorded Locality:

Occurrences of Tachyhydrite

Geological Setting:
Oceanic type potash-rich saline deposits.

Physical Properties of Tachyhydrite

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
Colourless, light yellow
Hardness (Mohs):
2
Cleavage:
Perfect
On {10_11}.
Density:
1.667 g/cm3 (Measured)    

Crystallography of Tachyhydrite

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.

Optical Data of Tachyhydrite

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 Tachyhydrite

Formula:
CaMg2Cl6 · 12H2O
Essential elements:
All elements listed in formula:
Analytical Data:
Very deliquescent.

Relationship of Tachyhydrite to other Species

3.BB.05EriochalciteCuCl2 · 2H2O
3.BB.10RokühniteFeCl2 · 2H2O
3.BB.15BischofiteMgCl2 · 6H2O
3.BB.20NickelbischofiteNiCl2 · 6H2O
3.BB.25SinjariteCaCl2 · 2H2O
3.BB.30AntarcticiteCaCl2 · 6H2O
8.4.1SellaiteMgF2
8.4.2NeighboriteNaMgF3
8.4.3BischofiteMgCl2 · 6H2O
8.4.4KorshunovskiteMg2Cl(OH)3 · 4H2O
8.4.5CarnalliteKMgCl3 · 6H2O
8.4.7FluoriteCaF2
8.4.8SinjariteCaCl2 · 2H2O
8.4.9AntarcticiteCaCl2 · 6H2O
8.4.10ChlorocalciteKCaCl3
8.4.11RorisiteCaFCl
8.4.12JarliteNa(Sr,Na)7MgAl6F32(OH,H2O)2
8.4.13CalcjarliteNa(Ca,Sr)3Al3(OH)2F14
8.4.14TikhonenkoviteSr[AlF4(OH)(H2O)]
8.4.15AcuminiteSr[AlF4(OH)(H2O)]
8.4.16FrankdicksoniteBaF2
8.4.17UsoviteBa2CaMgAl2F14
8.4.18BøgvaditeNa2SrBa2Al4F20

Other Names for Tachyhydrite

Name in Other Languages:

Other Information

Other Information:
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 Tachyhydrite

Reference List:
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 Tachyhydrite

Localities for Tachyhydrite

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.
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
Republic of Congo (Brazzaville)
 
  • Kouilou Department
Henry Rauche (2009) Updated Reserve and Resource Estimate for MagMinerals Kouilou Potash Project, Republic of Congo
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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