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Eugsterite Mineral Data

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General Eugsterite Information

Help on Chemical  Formula: Chemical Formula: Na4Ca(SO4)3•2(H2O)
Help on Composition: Composition: Molecular Weight = 456.26 gm
   Sodium    20.16 %  Na   27.17 % Na2O
   Calcium    8.78 %  Ca   12.29 % CaO
   Hydrogen   0.88 %  H     7.90 % H2O
   Sulfur    21.08 %  S    52.64 % SO3
   Oxygen    49.09 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na4Ca(SO4)3•2(H2O)
Help on Environment: Environment: Surface efflorescence on soils.
Help on IMA Status: IMA Status: Approved IMA 1981
Help on Locality: Locality: Sindo and Luanda, near Lake Victoria, Kenya. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Hans P. Eugster (1925-1987), Swiss-American mineralogist, John Hopkins University, awarded the Roebling Medal, 1983.
Help on Name Pronunciation: Name Pronunciation: Eugsterite + Pronunciation Say EUGSTERITE

Eugsterite Crystallography

Help on Crystal System: Crystal System: Monoclinic Space Group: Unk.
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.428(1), 5.5(0.64), 1.7126(0.61),

Physical Properties of Eugsterite

Help on Color: Color: Colorless.
Help on Density: Density: 2.5
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Efflorescences - Crystals covering matrix, generally produced from transpiro-evaporation.
Help on Hardness: Hardness: 1-2 - Between Talc and Gypsum
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Eugsterite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.001 (Superior) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.1976,KC= 0.1975
Ncalc = 1.49
Help on Optical Data: Optical Data: Biaxial (?), a=1.492, g=1.496, bire=0.0040

Calculated Properties of Eugsterite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.50 gm/cc
note: Specific Gravity of Eugsterite =2.50 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0019368651
Boson Index = 0.9980631349
Help on Photoelectric: Photoelectric: PEEugsterite = 2.69 barns/electron
U=PEEugsterite x rElectron Density= 6.71 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Eugsterite is Not Radioactive

Eugsterite Classification

Help on  Dana Class: Dana Class: (29)Hydrated Acid and Sulfates
  (29.04)where (A+)2 Bn (XO4)p � x(H2O)
  (29.04.02)Dana Group Eugsterite Na4Ca(SO4)3•2(H2O) Unk. Mono
Help on  Strunz Class: Strunz Class: 07.CD.25 07 - SULFATES (SELENATES, TELLURATES)
  07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O
  07.CD -With only large cations
07.CD.25 Eugsterite Na4Ca(SO4)3•2(H2O) Unk. Mono

Other Eugsterite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: 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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Dana No: Strunz No: 07.CD.25