Eugsterite Mineral Data

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.

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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

Diaphaniety:

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

Optical Data:

Biaxial (?), a=1.492, g=1.496, bire=0.0040

Calculated Properties of Eugsterite

Electron Density:

r_electron=2.50 gm/cc
note: r_Eugsterite=2.50 gm/cc.

Fermion Index

Fermion Index = 0.00193
Boson Index = 0.99807

Photoelectric:

PE_Eugsterite= 2.69 barns/electron
U=PE_Eugsterite x r_electron= 6.71 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Eugsterite is Not Radioactive

Eugsterite Classification

Dana Class:

29.4.2.1 (29)Hydrated Acid and Sulfates

(29.4)where (A+)2 Bn (XO4)p · x(H2O)

(29.4.2)Dana Group

29.4.2.1 Eugsterite Na4Ca(SO4)3·2(H2O) Unk. Mono

Strunz Class:

VI/C.21-30 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/C - Water-bearing sulfates without unfamiliar anions. Cations of very big size

VI/C.21 - Matteuccite - Mirabilite series

VI/C.21-10 Matteuccite NaHSO4·(H2O) Aa m

VI/C.21-20 Lecontite (NH4,K)Na(SO4)·2(H2O) P 2₁2₁2₁ 2 2 2

VI/C.21-30 Eugsterite Na4Ca(SO4)3·2(H2O) Unk. Mono

VI/C.21-40 Hydroglauberite Na4Ca(SO4)3·2(H2O) Unk. Ortho

VI/C.21-50 Wattevillite Na2Ca(SO4)2·4(H2O)(?) Unk Ortho

VI/C.21-60 Syngenite K2Ca(SO4)2·(H2O) P 2₁/m 2/m

VI/C.21-70 Koktaite (NH4)2Ca(SO4)2·(H2O) P 2₁/m 2/m

VI/C.21-80 Mirabilite Na2SO4·10(H2O) P 2₁/a 2/m

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 -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 -École des Mines de Paris

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Print or Cut-and-Paste your Eugsterite Specimen Label here :

Eugsterite

Na4Ca(SO4)3·2(H2O)
Dana No: 29.4.2.1 Strunz No: VI/C.21-30
Locality:

Notes: