Olsacherite Mineral Data

Olsacherite Mineral Data +

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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.

Synonym:

Kerstenite

Selenolite

Olsacherite Image

Images:

Olsacherite

Comments: Light yellow crystals of olsacherite up to 2 mm in matrix.
Location: Colquechaca, Potos?, 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 - DisphenoidalH-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),

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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

Diaphaniety:

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

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:

r_electron=5.72 gm/cc
note: r_Olsacherite=6.72 gm/cc.

Fermion Index

Fermion Index = 0.1498
Boson Index = 0.8502

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Olsacherite is Not Radioactive

Olsacherite Classification

Dana Class:

32.1.3.1 (32)Compound Sulfates

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

(32.1.3)Dana Group

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

Strunz Class:

VI/B.13-20 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/B - Waterfree sulfates [SO4]2- with unfamiliar anions. mostly big cations

VI/B.13 - Lanarkite - Susannite series

VI/B.13-10 Lanarkite Pb2(SO4)O C 2/m 2/m

VI/B.13-20 Olsacherite Pb2(SeO4)(SO4) P 2212 2 2 2

VI/B.13-30 Grandreefite Pb2SO4F2 A2/a 2/m

VI/B.13-40 Pseudograndreefite Pb6SO4F1O F 222 2 2 2

VI/B.13-50 Leadhillite Pb4(SO4)(CO3)2(OH)2 P 2₁/a 2/m

VI/B.13-60 Macphersonite Pb4(SO4)(CO3)2(OH)2 Pcab 2/m 2/m 2/m

VI/B.13-70 Susannite Pb4(SO4)(CO3)2(OH)2 R 3 3

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 -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 Olsacherite Specimen Label here :

Olsacherite

Pb2(SeO4)(SO4)
Dana No: 32.1.3.1 Strunz No: VI/B.13-20
Locality:

Notes: