Sidpietersite Mineral Data

General Sidpietersite Information

Chemical Formula:

Pb++4(S++++++O3S--)O2(OH)2

Composition:

Molecular Weight = 1,006.94 gm

Hydrogen 0.20 % H 1.79 % H₂O

Lead 82.31 % Pb 88.66 % PbO

Sulfur 6.37 % S

Oxygen 11.12 % O

______ ______

100.00 % 96.82 % = TOTAL OXIDE

Empirical Formula:

Pb₄(SO₃)SO₂(OH)₂

Environment:

Secondary mineral.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Single specimen collected from the 40th to 44th levels of the Tsumeb mine, Tsumeb, Namibia, Link to MinDat.org Location Data.

Name Origin:

Named after Sidney Pieters (1920-2003), of Windhoek, Namibia for his outstanding contributions to Namibian mineralogy.

Synonym:

ICSD 87736

IMA1998-036

Lead Thiosulfate

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Sidpietersite Crystallography

Axial Ratios:

a:b:c =1.1453:1:1.7234

Cell Dimensions:

a = 7.447, b = 6.502, c = 11.206, Z = 2; alpha = 114.3°, beta = 89.51°, gamma = 89.04° V = 494.44 Den(Calc)= 6.76

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 3.414(1), 10.13(1), 3.198(0.8),5.93(0.5), 2.622(0.4), 2.805(0.35), 2.889(0.35), 4.401(0.35),

Crystal Structure:

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Cooper M A , Hawthorne F C , The Canadian Mineralogist , 37 (1999) p.1275-1282, The structure topology of sidpietersite, Pb4(SO3S)O2(OH)2,, a novel thiosulfate structure

Physical Properties of Sidpietersite

Cleavage:

{011} Distinct

Color:

Cream white, Beige, Colorless.

Diaphaneity:

Opaque to translucent

Fracture:

Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

Habit:

Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).

Habit:

Nodular - Tuberose forms having irregular protuberances over the surface.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

1-2 - Between Talc and Gypsum

Luster:

Earthy (Dull)

Streak:

cream

Optical Properties of Sidpietersite

Optical Data:

NCalc= 1.95 - from Gladstone-Dale relationship (KC = 0.1407) where Ncalc=Dcalc*KC+1

Calculated Properties of Sidpietersite

Electron Density:

Bulk Density (Electron Density)=5.61 gm/cc
note: Specific Gravity of Sidpietersite =6.76 gm/cc.

Fermion Index:

Fermion Index = 0.18
Boson Index = 0.82

Photoelectric:

PE_{Sidpietersite}=1,522.31 barns/electron
U=PE_{Sidpietersite} x rElectron Density=8,543.79 barns/cc.

Radioactivity:

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

Sidpietersite Classification

Dana Class:

34.06.08.01 (34)Selenites - Tellurites - Sulfites

(34.06)Dana Type

(34.06.08)Dana Group

34.06.08.01 Sidpietersite! Pb4(SO3S--)O2(OH)2 P1 1

Strunz Class:

07.JA.05 07 - SULFATES (SELENATES, TELLURATES)

07.J - Thiosulfates

07.JA -Thiosulfates with Pb

07.JA.05 Sidpietersite! Pb4(SO3S--)O2(OH)2 P1 1

Other Sidpietersite Information

References:

NAME( CanMin, 8/99) PHYS. PROP.(CanMin, 10/99)

See Also:

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

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

Sidpietersite

Pb++4(S++++++O3S--)O2(OH)2
Dana No: 34.06.08.01 Strunz No: 07.JA.05
Locality:

Notes: