Oldhamite Mineral Data

Oldhamite Mineral Data +

General Oldhamite Information

Chemical Formula:

(Ca,Mg,Fe)S

Composition:

Molecular Weight = 72.14 gm

Calcium 50.00 % Ca

Magnesium 1.68 % Mg

Iron 3.87 % Fe

Sulfur 44.45 % S

______

100.00 %

Empirical Formula:

Ca_0.9Mg_0.05Fe²⁺_0.05S

Environment:

Fills the intersticies between silicates in enstatite chondrite and achondrite meteorites.

IMA Status:

Valid Species (Pre-IMA) 1862

Locality:

Bustee meteorite, Gorakhpur, Basti distr., Uttar Pradesh, India. Link to MinDat.org Location Data.

Name Origin:

Named for Thomas Oldham (1816-1878), Director of the Indian Geologial Survey (185o-1876).

Synonym:

ICSD 60200

PDF 8-464

Oldhamite Image

Images:

Oldhamite

Comments: Brown crystalline oldhamite grains in anhydrite.
Location: Ronneburg, Thuringen, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Oldhamite Crystallography

Cell Dimensions:

a = 5.686, Z = 4; V = 183.83 Den(Calc)= 2.61

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F m3m

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

By Intensity(I/I_o): 2.846(1), 2.013(0.7), 1.6439(0.21),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Wyckoff R W G , Crystal Structures , 1 (1963) p.85-237, Second edition. Interscience Publishers, New York, New York, rocksalt structure

Physical Properties of Oldhamite

Cleavage:

[001] Good

Color:

Light brown, Dark brown.

Density:

2.58

Diaphaniety:

Transparent

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Hardness:

4 - Fluorite

Luster:

Sub Metallic

Optical Properties of Oldhamite

Optical Data:

Isotropic, n=2.137.

Calculated Properties of Oldhamite

Electron Density:

r_electron=2.60 gm/cc
note: r_Oldhamite=2.61 gm/cc.

Fermion Index

Fermion Index = 0.00651
Boson Index = 0.99349

Photoelectric:

PE_Oldhamite= 9.62 barns/electron
U=PE_Oldhamite x r_electron= 24.98 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Oldhamite is Not Radioactive

Oldhamite Classification

Dana Class:

2.8.1.5 (2)Sulfides - Including Selenides and Tellurides

(2.8)where Am Bn Xp, with (m+n):p=1:1

(2.8.1)Galena Group (Isometric: Fm3m)

2.8.1.1 Galena PbS F m3m 4/m 3 2/m

2.8.1.2 Clausthalite PbSe F m3m 4/m 3 2/m

2.8.1.3 Altaite PbTe F m3m 4/m 3 2/m

2.8.1.4 Alabandite MnS F m3m 4/m 3 2/m

2.8.1.5 Oldhamite (Ca,Mg,Fe)S F m3m 4/m 3 2/m

2.8.1.6 Niningerite (Mg,Fe,Mn)S F m3m 4/m 3 2/m

2.8.1.7 Borovskite Pd3SbTe4 F m3m 4/m 3 2/m

2.8.1.8 Crerarite (Pt,Pb)Bi3(S,Se)4-x(x~0.7) F m3m 4/m 3 2/m

2.8.1.9 Keilite! (Fe,Mg)S F m3m 4/m 3 2/m

Strunz Class:

II/C.15-20 II - Sulfides and sulphosalts

II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1

II/C.15 - Galenite group

II/C.15-05 Keilite! (Fe,Mg)S F m3m 4/m 3 2/m

II/C.15-10 Niningerite (Mg,Fe,Mn)S F m3m 4/m 3 2/m

II/C.15-20 Oldhamite (Ca,Mg,Fe)S F m3m 4/m 3 2/m

II/C.15-30 Alabandite MnS F m3m 4/m 3 2/m

II/C.15-40 Galena PbS F m3m 4/m 3 2/m

II/C.15-50 Clausthalite PbSe F m3m 4/m 3 2/m

II/C.15-60 Altaite PbTe F m3m 4/m 3 2/m

II/C.15-70 Crerarite (Pt,Pb)Bi3(S,Se)4-x(x~0.7) F m3m 4/m 3 2/m

Other Oldhamite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Oldhamite :
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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Oldhamite

(Ca,Mg,Fe)S
Dana No: 2.8.1.5 Strunz No: II/C.15-20
Locality:

Notes: