Olsacherite Mineral Data

General Olsacherite Information

Chemical Formula:

Pb2(SeO4)(SO4)

Composition:

Molecular Weight = 653.42 gm

Lead 63.42 % Pb 68.32 % PbO

Selenium 12.08 % Se 19.43 % SeO₃

Sulfur 4.91 % S 12.25 % SO₃

Oxygen 19.59 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Pb₂(SeO₄)(SO₄)

Environment:

Oxidation product of penroseite.

IMA Status:

Approved IMA 1969

Locality:

Pacajake mine, Hiaco, Bolivia. Link to MinDat.org Location Data.

Name Origin:

Named for Juan A. Olsacher (1903-1964), Argentine mineralogist, University of Cordoba.

Name Pronunciation:

Olsacherite + Pronunciation

Synonym:

Kerstenite

Selenolite

Olsacherite Image

Images:

Olsacherite

Comments: Light yellow crystals of olsacherite up to 2 mm in matrix.
Location: Colquechaca, PotosÃ, Bolivia. Scale: Picture size 1.5 cm.
© John Veevaert

Olsacherite Crystallography

Axial Ratios:

a:b:c =0.7682:1:0.6386

Cell Dimensions:

a = 8.42, b = 10.96, c = 7, Z = 4; V = 645.98 Den(Calc)= 6.72

Crystal System:

Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: P 2212

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

By Intensity(I/I_o): 3.015(1), 3.234(1), 3.338(1),

Forms:

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Forms: ( 1 1 1) ( 1 0 1) ( 1 1 1)

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Physical Properties of Olsacherite

Cleavage:

{101} Good, {010} Fair

Color:

Colorless.

Density:

6.55

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Acicular - Occurs as needle-like crystals.

Hardness:

3-3.5 - Calcite-Copper Penny

Luster:

Vitreous - Dull

Streak:

white

Optical Properties of Olsacherite

Gladstone-Dale:

CI meas= -0.016 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1431,KPDmeas= 0.1468,KC= 0.1444
Ncalc = 1.95 - 1.97

Optical Data:

Biaxial (-), a=1.935, b=1.966, g=1.983, bire=0.0480, 2V(Calc)=72, 2V(Meas)=80.

Calculated Properties of Olsacherite

Electron Density:

Bulk Density (Electron Density)=5.72 gm/cc
note: Specific Gravity of Olsacherite =6.72 gm/cc.

Fermion Index:

Fermion Index = 0.14
Boson Index = 0.86

Photoelectric:

PE_Olsacherite=1,154.50 barns/electron
U=PE_Olsacherite x rElectron Density=6,601.51 barns/cc.

Radioactivity:

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

Olsacherite Classification

Dana Class:

32.01.03.01 (32)Compound Sulfates

(32.01)(anhydrous) with simple bi-anionic formula

(32.01.03)Dana Group

32.01.03.01 Olsacherite Pb2(SeO4)(SO4) P 2212 2 2 2

Strunz Class:

07.AD.35 07 - SULFATES (SELENATES, TELLURATES)

07.A - Sulfates (selenates, etc.) without Additional Anions, without H2O

07.AD -With only large cations

07.AD.35 Anglesite PbSO4 Pbnm 2/m 2/m 2/m

07.AD.35 Barite BaSO4 Pbnm 2/m 2/m 2/m

07.AD.35 Celestine SrSO4 Pbnm 2/m 2/m 2/m

07.AD.35 Olsacherite Pb2(SeO4)(SO4) P 2212 2 2 2

07.AD.35 Radiobarite* (Ba,Ra)SO4 2/m 2/m 2/m

Other Olsacherite Information

References:

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

See Also:

Links to other databases for Olsacherite :
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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Olsacherite

Pb2(SeO4)(SO4)
Dana No: 32.01.03.01 Strunz No: 07.AD.35
Locality:

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