Oldhamite information

Oldhamite
Oldhamite
	Oldhamite (field of view: 1.5 cm)
General
Category	Sulfide mineral
Formula; (repeating unit)	(Ca,Mg)S
IMA symbol	Old
Strunz classification	2.CD.10
Crystal system	Cubic
Crystal class	Hexoctahedral (m3m) ; H-M symbol: (4/m 3 2/m)
Space group	Fm3m
Unit cell	a = 5.69 Å; Z = 4
Identification
Color	Pale chestnut-brown
Crystal habit	Crystal nodules, anhedral grains
Cleavage	Good on {001}
Mohs scale hardness	4
Luster	Sub-metallic
Diaphaneity	Transparent
Specific gravity	2.58
Optical properties	Isotropic
Refractive index	n = 2.137
Fusibility	2450 °C
Alters to	Tarnishes on exposure to moist air
References

Oldhamite is a calcium magnesium sulfide mineral with the chemical formula (Ca,Mg)S.^[2]^[3] Ferrous iron may also be present in the mineral resulting in the chemical formula (Ca,Mg,Fe)S.^[4] It is a pale to dark brown accessory mineral in meteorites. It crystallizes in the cubic crystal system, but typically occurs as anhedral grains between other minerals.

^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
^ ^a ^b Handbook of Mineralogy
^ ^a ^b Oldhamite on Mindat.org
^ ^a ^b Webmineral dat for oldhamite

[1] Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.

[HBM-2] Handbook of Mineralogy

[Mindat-3] Oldhamite on Mindat.org

[Webmin-4] Webmineral dat for oldhamite

Oldhamite information

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Oldhamite

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Sulfide mineral

Glossary of chemical formulae

List of mineral symbols

Enstatite chondrite

List of meteorite minerals

Pyrometamorphism

Osbornite

Thomas Oldham

Zaklodzie meteorite