Thorikosite Mineral Data

General Thorikosite Information

Chemical Formula:

Pb3(Sb+++,As+++)O3(OH)Cl2

Composition:

Molecular Weight = 867.55 gm

Antimony 10.53 % Sb 12.60 % Sb₂O₃

Arsenic 2.16 % As 2.85 % As₂O₃

Hydrogen 0.12 % H 1.04 % H₂O

Lead 71.65 % Pb 77.18 % PbO

Chlorine 8.17 % Cl 8.17 % Cl

- % Cl -1.84 % -O=Cl₂

Oxygen 7.38 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Pb₃(SbO₃)_0.75(AsO₃)_0.25(OH)Cl₂

Environment:

Sea water altered metallugical slags.

IMA Status:

Approved IMA 1985

Locality:

Thorikos, near the Laurium mines. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Thorikosite + Pronunciation

Synonym:

ICSD 62160

PDF 38-403

Thorikosite Image

Images:

Thorikosite

Comments: Yellow, prismatic crystals of Thorikosite on matrix.
Location: Passa Limani Cove slag locality, Passa Limani area, Lavrion District, AttikÃ (Attica; Attika) Prefecture, Greece. Scale: Picture size 1.6 mm.
© Thomas Witzke / Abraxas-Verlag

Thorikosite Crystallography

Axial Ratios:

a:c = 1:3.27991

Cell Dimensions:

a = 3.919, c = 12.854, Z = 1; V = 197.42 Den(Calc)= 7.30

Crystal System:

Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: I 4/mmm

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

By Intensity(I/I_o): 2.891(1), 3.754(0.7), 2.775(0.5),

Physical Properties of Thorikosite

Cleavage:

{001} Perfect

Color:

Light yellow.

Density:

7.24

Fracture:

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

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Thorikosite

Optical Data:

NCalc= 2.2 - from Gladstone-Dale relationship (KC = 0.1643) where Ncalc=Dcalc*KC+1
NCalc= 2.19 - from Gladstone-Dale relationship (KC = 0.1643) where Ncalc=Dmeas*KC+1

Calculated Properties of Thorikosite

Electron Density:

Bulk Density (Electron Density)=6.05 gm/cc
note: Specific Gravity of Thorikosite =7.30 gm/cc.

Fermion Index:

Fermion Index = 0.15
Boson Index = 0.85

Photoelectric:

PE_Thorikosite=1,366.80 barns/electron
U=PE_Thorikosite x rElectron Density=8,269.13 barns/cc.

Radioactivity:

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

Thorikosite Classification

Dana Class:

10.02.06.01 (10)Oxyhalides and Hydroxyhalides

(10.02)where A (O,OH) Xq

(10.02.06)Dana Group

10.02.06.01 Thorikosite Pb3(Sb,As)O3(OH)Cl2 I 4/mmm 4/m 2/m 2/m

Strunz Class:

03.DC.40 03 - HALIDES

03.D - Oxyhalides, Hydroxyhalides and Related Double Halides

03.DC -With Pb (As,Sb,Bi), without Cu

03.DC.40 Thorikosite Pb3(Sb,As)O3(OH)Cl2 I 4/mmm 4/m 2/m 2/m

Other Thorikosite Information

References:

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

See Also:

Links to other databases for Thorikosite :
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
15 - WWW-MINCRYST

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

Thorikosite

Pb3(Sb+++,As+++)O3(OH)Cl2
Dana No: 10.02.06.01 Strunz No: 03.DC.40
Locality:

Notes:

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