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Eugsterite Mineral Data
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General Eugsterite Information
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 Chemical Formula: |
Na4Ca(SO4)3•2(H2O) |
| Composition: |
Molecular Weight = 456.26 gm |
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Sodium 20.16 % Na 27.17 % Na2O |
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Calcium 8.78 % Ca 12.29 % CaO |
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Hydrogen 0.88 % H 7.90 % H2O |
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Sulfur 21.08 % S 52.64 % SO3 |
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Oxygen 49.09 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Na4Ca(SO4)3•2(H2O) |
| Environment: |
Surface efflorescence on soils. |
| IMA Status: |
Approved IMA 1981 |
| Locality: |
Sindo and Luanda, near Lake Victoria, Kenya. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Hans P. Eugster (1925-1987), Swiss-American mineralogist, John Hopkins University, awarded the Roebling Medal, 1983. |
| Name Pronunciation: |
Eugsterite + Pronunciation  |
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Eugsterite Crystallography
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| Crystal System: |
Monoclinic Space Group: Unk. |
| X Ray Diffraction: |
By Intensity(I/Io): 3.428(1), 5.5(0.64), 1.7126(0.61), |
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Physical Properties of Eugsterite
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| Color: |
Colorless. |
| Density: |
2.5 |
| Diaphaneity: |
Transparent |
| Habit: |
Efflorescences - Crystals covering matrix, generally produced from transpiro-evaporation. |
| Hardness: |
1-2 - Between Talc and Gypsum |
| Luster: |
Vitreous (Glassy) |
| Streak: |
white |
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Optical Properties of Eugsterite
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| Gladstone-Dale: |
CI meas= -0.001 (Superior) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.1976,KC= 0.1975
Ncalc = 1.49 |
| Optical Data: |
Biaxial (?), a=1.492, g=1.496, bire=0.0040 |
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Calculated Properties of Eugsterite
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| Electron Density: |
Bulk Density (Electron Density)=2.50 gm/cc
note: Specific Gravity of Eugsterite =2.50 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0019368651
Boson Index = 0.9980631349 |
| Photoelectric: |
PEEugsterite = 2.69 barns/electron
U=PEEugsterite x rElectron Density= 6.71 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Eugsterite is Not Radioactive |
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Eugsterite Classification
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| Dana Class: |
29.04.02.01 (29)Hydrated Acid and Sulfates |
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(29.04)where (A+)2 Bn (XO4)p � x(H2O) |
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(29.04.02)Dana Group |
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29.04.02.01 Eugsterite Na4Ca(SO4)3•2(H2O) Unk. Mono |
| Strunz Class: |
07.CD.25 07 - SULFATES (SELENATES, TELLURATES) |
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07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O |
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07.CD -With only large cations |
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07.CD.25 Eugsterite Na4Ca(SO4)3•2(H2O) Unk. Mono |
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Other Eugsterite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8) |
| See Also: |
Links to other databases for Eugsterite :
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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Print or Cut-and-Paste your Eugsterite Specimen Label here :
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Eugsterite
Na4Ca(SO4)3•2(H2O)
Dana No: 29.04.02.01 Strunz No: 07.CD.25
Locality:
Notes:
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