Wattevillite Mineral Data

Wattevillite Mineral Data +

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General Wattevillite Information

Chemical Formula:

Na2Ca(SO4)2•4(H2O) (?)

Composition:

Molecular Weight = 350.25 gm

Sodium 13.13 % Na 17.70 % Na₂O

Calcium 11.44 % Ca 16.01 % CaO

Hydrogen 2.30 % H 20.57 % H₂O

Sulfur 18.31 % S 45.72 % SO₃

Oxygen 54.82 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂Ca(SO₄)₂•4(H₂O)

Environment:

A questionable species. Associated with other sulfates in a pyritic lignite.

IMA Status:

Valid Species (Pre-IMA) 1879

Locality:

Einigkeit mine, Bauersberg, near Bischofsheim, Bavaria, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for Oscar de Watteville of Paris, France.

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Wattevillite Crystallography

Crystal System:

OrthorhombicSpace Group: Unk

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

By Intensity(I/I_o): 4.39(1), 4.2(0.6), 2.89(0.5),2.95(0.5), 5.44(0.5), 2.67(0.4), 4.03(0.4), 5.1(0.4),

Physical Properties of Wattevillite

Color:

White.

Density:

1.81

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Luster:

Silky

Streak:

white

Optical Properties of Wattevillite

Gladstone-Dale:

CI meas= -0.139 (Poor) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2484,KC= 0.2181

Optical Data:

Biaxial (-), a=1.435, b=1.455, g=1.459, bire=0.0240, 2V(Calc)=46, 2V(Meas)=48. Dispersion dispersion not observed.

Calculated Properties of Wattevillite

Electron Density:

r_electron=1.84 gm/cc
note: r_Wattevillite=1.81 gm/cc.

Fermion Index

Fermion Index = 0.00179
Boson Index = 0.99821

Photoelectric:

PE_Wattevillite= 2.74 barns/electron
U=PE_Wattevillite x r_electron= 5.04 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Wattevillite is Not Radioactive

Wattevillite Classification

Dana Class:

29.3.4.1 (29)Hydrated Acid and Sulfates

(29.3)where (A+)2 B (XO4)2 • x(H2O)

(29.3.4)Dana Group

29.3.4.1 Wattevillite Na2Ca(SO4)2•4(H2O)(?) Unk Ortho

Strunz Class:

VI/C.21-50 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 Wattevillite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Wattevillite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - Handbook of Mineralogy (MinSocAm)
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - MinMax(Deutsch)
9 - MinMax(English)
10 - Mineralienatlas (Deutsch)
11 - QUT Mineral Atlas
12 - Ruff.Info

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Wattevillite

Na2Ca(SO4)2·4(H2O) (?)
Dana No: 29.3.4.1 Strunz No: VI/C.21-50
Locality:

Notes: