Tachyhydrite Mineral Data + 
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- 11.5.5.1 Tachyhydrite CaMg2Cl6·12(H2O) P 3 3
- III/C.08-10 Carnallite KMgCl3·6(H2O) Pcna 2/m 2/m 2/m
- III/C.08-20 Koenenite Na4Mg4Cl12·Mg5Al4(OH)22 R 3m 3 2/m
- III/C.08-30 Tachyhydrite CaMg2Cl6·12(H2O) P 3 3
General Tachyhydrite Information |
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 Chemical Formula: |
CaMg2Cl6·12(H2O) | ||
| 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 | |||
| Empirical Formula: |
CaMg2Cl6·12(H2O) | ||
| Environment: |
Rare constituent of marine salt deposits. | ||
| IMA Status: |
Valid Species (Pre-IMA) 1856 | ||
| Locality: |
Stassfurt, Province of Saxony, Germany. Link to MinDat.org Location Data. | ||
| Name Origin: |
From the Greek for "quick water", in allusion to its ready deliquescence. | ||
| Synonym: |
ICSD 16434 | ||
| PDF 34-788 | |||
Tachyhydrite Image | |||
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Images:
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Tachyhydrite Crystallography |
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| Axial Ratios: |
a:c = 1:1.70856 | ||
| Cell Dimensions: |
a = 10.136, c = 17.318, Z = 3; V = 1,540.85 Den(Calc)= 1.67 | ||
| Crystal System: |
Trigonal - RhombohedralH-M Symbol ( 3) Space Group: P 3 | ||
| X Ray Diffraction: |
By Intensity(I/Io): 2.6(1), 3.09(0.5), 3.8(0.3), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Tachyhydrite |
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| Cleavage: |
[1011] Good, [1011] Good, [1011] Good | ||
| Color: |
Colorless, Yellow. | ||
| Density: |
1.66 | ||
| Diaphaniety: |
Transparent to translucent | ||
| Habit: |
Deliquescent - Crystals absorb water from the air and melt or otherwise deteriorate. | ||
| Habit: |
Massive - Uniformly indistinguishable crystals forming large masses. | ||
| Habit: |
Tastes Bitter - Bitter taste from water soluble Mg or Ca compounds. | ||
| Hardness: |
2 - Gypsum | ||
| Luster: |
Vitreous - Greasy | ||
| Streak: |
white | ||
Optical Properties of Tachyhydrite |
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| Gladstone-Dale: |
CI meas= 0.046 (Good) - where the CI = (1-KPDmeas/KC) CI calc= 0.052 (Good) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.309,KPDmeas= 0.3108,KC= 0.3258 |
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| Optical Data: |
Uniaxial (-), e=1.512, w=1.52, bire=0.0080. | ||
Calculated Properties of Tachyhydrite |
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| Electron Density: |
relectron=1.71 gm/cc |
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| Fermion Index |
Fermion Index = 0.00968 Boson Index = 0.99032 |
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| Photoelectric: |
PETachyhydrite = 3.82 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Tachyhydrite is Not Radioactive |
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Tachyhydrite Classification |
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| Dana Class: |
11.5.5.1 (11)Halide Complexes; Alumino-fluorides | ||
| (11.5)where (A)m B (X)6 | |||
| (11.5.5)Dana Group | |||
| Strunz Class: |
III/C.08-30 III - Halogenides | ||
| III/C - Double halogenides with water, Chlorides | |||
| III/C.08 - Carnallite - Tachyhydrite series | |||
Other Tachyhydrite Information |
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| References: |
NAME( Ford32) PHYS. PROP.(Ford32) OPTIC PROP.(Ford32) | ||
| See Also: |
Links to other databases for Tachyhydrite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris Search for Tachyhydrite using: Visit our Advertisers for Tachyhydrite : Translate Tachyhydrite Mineral Data : Ask about Tachyhydrite here : Print or Cut-and-Paste your Tachyhydrite Specimen Label here :
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