Mineralogy Database

Tachyhydrite Mineral Data

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General Tachyhydrite Information

Help on Chemical  Formula: Chemical Formula: CaMg2Cl6•12(H2O)
Help on Composition: Composition: Molecular Weight = 517.59 gm
   Calcium     7.74 %  Ca   10.83 % CaO
   Magnesium   9.39 %  Mg   15.57 % MgO
   Hydrogen    4.67 %  H    41.77 % H2O
   Chlorine   41.10 %  Cl   41.10 % Cl
                -   %   Cl   -9.27 % -O=Cl2   
   Oxygen     37.09 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaMg2Cl6•12(H2O)
Help on Environment: Environment: Rare constituent of marine salt deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1856
Help on Locality: Locality: Stassfurt, Province of Saxony, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek for "quick water", in allusion to its ready deliquescence.
Help on Name Pronunciation: Name Pronunciation: Tachyhydrite + Pronunciation Say TACHYHYDRITE
Help on Synonym: Synonym: ICSD 16434
  PDF 34-788

Tachyhydrite Image

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Comments: Translucent pink tinted granular tachyhydrite.
Location: Stassfurt, Sachsen-Anhalt, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Tachyhydrite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.70856
Help on Cell Dimensions: Cell Dimensions: a = 10.136, c = 17.318, Z = 3; V = 1,540.85 Den(Calc)= 1.67
Help on Crystal System: Crystal System: Trigonal - Rhombohedral H-M Symbol ( 3) Space Group: P 3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.6(1), 3.09(0.5), 3.8(0.3),

Physical Properties of Tachyhydrite

Help on Cleavage: Cleavage: {1011} Good, {1011} Good, {1011} Good
Help on Color: Color: Colorless, Yellow.
Help on Density: Density: 1.66
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Habit: Habit: Deliquescent - Crystals absorb water from the air and melt or otherwise deteriorate.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Tastes Bitter - Bitter taste from water soluble Mg or Ca compounds.
Help on Hardness: Hardness: 2 - Gypsum
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: white

Optical Properties of Tachyhydrite

Help on Optical Data: Optical Data: Uniaxial (-), e=1.512, w=1.52, bire=0.0080.

Calculated Properties of Tachyhydrite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=1.72 gm/cc
note: Specific Gravity of Tachyhydrite =1.67 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.009681242
Boson Index = 0.990318758
Help on Photoelectric: Photoelectric: PETachyhydrite = 3.82 barns/electron
U=PETachyhydrite x rElectron Density= 6.56 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tachyhydrite is Not Radioactive

Tachyhydrite Classification

Help on  Dana Class: Dana Class: (11)Halide Complexes; Alumino-fluorides
  (11.05)where (A)m B (X)6
  (11.05.05)Dana Group Tachyhydrite CaMg2Cl6•12(H2O) P 3 3
Help on  Strunz Class: Strunz Class: 03.BB.35 03 - HALIDES
  03.B - Simple Halides, with H2O
  03.BB -M:X = 1:2
03.BB.35 Tachyhydrite CaMg2Cl6•12(H2O) P 3 3

Other Tachyhydrite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Ford32) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Tachyhydrite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 03.BB.35





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