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Tachyhydrite

A valid IMA mineral species - grandfathered
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A very hygroscopic hydrated chloride mineral.


Unique Identifiers

First published:
1856
Type description reference:
Rammelsberg, C. (1856) Ueber den tachhydrit, ein neues mineral aus dem Steinsalzlager von Stassfurth. Annalen der Physik und Chemie, 98, 261-263.

Classification of Tachyhydrite
Dana 8th ed.:
11.5.5.1

11 : HALIDE COMPLEXES
5 : AmBX6

Hey's CIM Ref.:
8.4.6

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

Mineral Symbols
Transparency:
Transparent
Colour:
Colourless, light yellow
Streak:
White
Hardness:
2 onMohs scale
Cleavage:
Perfect
On {1011}.
Density:
1.667 g/cm3 (Measured)    1.673 g/cm3 (Calculated)

Optical Data of Tachyhydrite
Surface Relief:
Low
Pleochroism:
Non-pleochroic
Comments:
Not dichroic.

Chemistry of Tachyhydrite

Crystallography of Tachyhydrite
Place of Conservation of Type Material:
No defined type material.
Geological Setting of Type Material:
Oceanic-type, potash-rich saline deposit.
Associated Minerals at Type Locality:
CarnalliteKainite
Reference:
Rammelsberg C (1856) Ueber den tachhydrit, ein neues mineral aus dem Steinsalzlager von Stassfurth. Annalen der Physik und Chemie 98, 261-263

Other Language Names for Tachyhydrite

Common AssociatesMon. 2/m :P21/b3.BB.05EriochalciteCuCl2 · 2H2OOrth.mmm(2/m2/m2/m) :Pmna3.BB.10RokühniteFeCl2 · 2H2OMon.3.BB.15BischofiteMgCl2 · 6H2OMon. 2/m :B2/m3.BB.20NickelbischofiteNiCl2 · 6H2OMon. 2/m3.BB.25SinjariteCaCl2 · 2H2OTet.3.BB.30AntarcticiteCaCl2 · 6H2OTrig. 32 :P3213.BB.35AravaipaitePb3AlF9 · H2OTric.1 :P13.BB.40GhiaraiteCaCl2 · 4H2OTric.1 :P1

Other Information
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    • References for TachyhydriteⓘHallein - Bad Dürrnberg salt mineStrasser (1989)
    Brazil
     
    www.cetem.gov.br (n.d.)
    Chile
     
    Cabestrero et al. (2022)
    Eurasian Plate
     
    Wang et al. (2017)
    Germany
     
    Weiß (1990)Füchtbauer et al. (1956)Weiß (1990)Niemann (1960)Bode "Mineralien und Fundstellen BRD" ...Dana 6: Appendix 3: 40+1 other referencePalache et al. (1951)Brockt et al. (2001)Palache et al. (1951)+1 other reference
    Poland
     
    Wachowiak et al. (2016)
    Republic of the Congo
     
    Zhao et al. (2016)Henry Rauche (2009)Milesi et al. (2006)
    Russia
     
    Vergasova et al. (1977)+1 other reference
    Spain
     
    Campeny et al. (2023)
    Thailand
     
    Tabakh et al. (1998)Suwanich (2010)
    UK
     
    Mineralogical Magazine 1959 32 : ...
    USA
     
    Northrop et al. (1996)Hawley+5 other references
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