Eugsterite Mineral Data

General Eugsterite Information

Chemical Formula:

Na4Ca(SO4)3•2(H2O)

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

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

Crystal System:

MonoclinicSpace Group: Unk.

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.428(1), 5.5(0.64), 1.7126(0.61),

Physical Properties of Eugsterite

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

Optical Properties of Eugsterite

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

Calculated Properties of Eugsterite

Electron Density:

Bulk Density (Electron Density)=2.50 gm/cc
note: Specific Gravity of Eugsterite =2.50 gm/cc.

Fermion Index:

Fermion Index = 0.0019368651
Boson Index = 0.9980631349

Photoelectric:

PE_Eugsterite= 2.69 barns/electron
U=PE_Eugsterite x rElectron Density= 6.71 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Eugsterite is Not Radioactive

Eugsterite Classification

Dana Class:

29.04.02.01 (29)Hydrated Acid and Sulfates

(29.04)where (A+)2 Bn (XO4)p · x(H2O)

(29.04.02)Dana Group

29.04.02.01 Eugsterite Na4Ca(SO4)3•2(H2O) Unk. Mono

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

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 :

Eugsterite

Na4Ca(SO4)3•2(H2O)
Dana No: 29.04.02.01 Strunz No: 07.CD.25
Locality:

Notes: