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Tachyhydrite Mineral Data
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General Tachyhydrite Information
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 Chemical Formula: |
CaMg2Cl6•12(H2O) |
| Composition: |
Molecular Weight = 517.59 gm |
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Calcium 7.74 % Ca 10.83 % CaO |
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Magnesium 9.39 % Mg 15.57 % MgO |
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Hydrogen 4.67 % H 41.77 % H2O |
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Chlorine 41.10 % Cl 41.10 % Cl |
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- %
Cl -9.27 % -O=Cl2 |
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Oxygen 37.09 % O |
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______ ______ |
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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. |
| Name Pronunciation: |
Tachyhydrite + Pronunciation  |
| Synonym: |
ICSD 16434 |
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PDF 34-788 |
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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 - Rhombohedral H-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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Physical Properties of Tachyhydrite
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| Cleavage: |
{1011} Good, {1011} Good, {1011} Good |
| Color: |
Colorless, Yellow. |
| Density: |
1.66 |
| Diaphaneity: |
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 |
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Optical Properties of Tachyhydrite
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| Optical Data: |
Uniaxial (-), e=1.512, w=1.52, bire=0.0080. |
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Calculated Properties of Tachyhydrite
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| Electron Density: |
Bulk Density (Electron Density)=1.72 gm/cc
note: Specific Gravity of Tachyhydrite =1.67 gm/cc.
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| Fermion Index: |
Fermion Index = 0.009681242
Boson Index = 0.990318758 |
| Photoelectric: |
PETachyhydrite = 3.82 barns/electron
U=PETachyhydrite x rElectron Density= 6.56 barns/cc.
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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: |
11.05.05.01 (11)Halide Complexes; Alumino-fluorides |
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(11.05)where (A)m B (X)6 |
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(11.05.05)Dana Group |
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11.05.05.01 Tachyhydrite CaMg2Cl6•12(H2O) P 3 3 |
| Strunz Class: |
03.BB.35 03 - HALIDES |
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03.B - Simple Halides, with H2O |
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03.BB -M:X = 1:2 |
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03.BB.35 Tachyhydrite CaMg2Cl6•12(H2O) P 3 3 |
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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 - 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
15 - WWW-MINCRYST
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Print or Cut-and-Paste your Tachyhydrite Specimen Label here :
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Tachyhydrite
CaMg2Cl6•12(H2O)
Dana No: 11.05.05.01 Strunz No: 03.BB.35
Locality:
Notes:
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