Thorikosite Mineral Data

Thorikosite Mineral Data +

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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.

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, Attik? (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 DipyramidalH-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),

Crystal Structure:

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Rouse R C , Dunn P J , Journal of Solid State Chemistry , 57 (1985) p.389-395, The structure of thorisokite, a naturally occurring member of the bismuth oxyhalide group

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:

r_electron=6.05 gm/cc
note: r_Thorikosite=7.30 gm/cc.

Fermion Index

Fermion Index = 0.15838
Boson Index = 0.84162

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Thorikosite is Not Radioactive

Thorikosite Classification

Dana Class:

10.2.6.1 (10)Oxyhalides and Hydroxyhalides

(10.2)where A (O,OH) Xq

(10.2.6)Dana Group

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

Strunz Class:

III/D.11-60 III - Halogenides

III/D - Oxi-halogenides with Pb - Bi - Sb and related compounds

III/D.11 - Mendipite - Onoratoite series

III/D.11-10 Mendipite Pb3Cl2O2 P 2₁2₁2₁ 2 2 2

III/D.11-15 Damaraite Pb3O2(OH)Cl Pmc2 mm2

III/D.11-17 Chubutite* Pb7O6Cl2 Unk Ortho

III/D.11-20 Penfieldite Pb2Cl3(OH) P 6/mmm 6/m 2/m 2/m

III/D.11-30 Blixite Pb2Cl(O,OH)2 Unk Ortho

III/D.11-35 Mereheadite! Pb2O(OH)Cl C 2/c 2/m

III/D.11-40 Sundiusite Pb10(SO4)Cl2O8 C 2,Cm,C 2/m Mono

III/D.11-50 Asisite Pb12(SiO4)O8Cl4 I 4/mmm 4/m 2/m 2/m

III/D.11-55 Parkinsonite (Pb,Mo,[])8O8Cl2 I 4/mmm 4/m 2/m 2/m

III/D.11-60 Thorikosite Pb3(Sb,As)O3(OH)Cl2 I 4/mmm 4/m 2/m 2/m

III/D.11-65 Philolithite! Pb12O6Mn(Mg,Mn)2(Mn,Mg)4(SO4)(CO3)4Cl4(OH)12 P 4₁/nnm 4/m 2/m 2/m

III/D.11-70 Pinalite Pb3(WO4)OCl2 Amam 2/m 2/m 2/m

III/D.11-80 Nadorite PbSbO2Cl Bmmb 2/m 2/m 2/m

III/D.11-90 Perite PbBiO2Cl Bmmb 2/m 2/m 2/m

III/D.11-100 Heliophyllite Pb6As2O7Cl4 Unk Ortho

III/D.11-110 Ecdemite Pb6As2O7Cl4 Unk Tetra

III/D.11-120 Onoratoite Sb8O11Cl2 C 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 -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 - WWW-MINCRYST 13 -École des Mines de Paris

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Thorikosite

Pb3(Sb+++,As+++)O3(OH)Cl2
Dana No: 10.2.6.1 Strunz No: III/D.11-60
Locality:

Notes: