Galaxite: Difference between revisions
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It was first described in 1932 for an occurrence at Bald Knob, [[Alleghany County, North Carolina]] near its namesakes, the town of [[Galax, Virginia]] and the [[plant]] [[galax]] which grows in the area.<ref name=Webmin/><ref name=HBM/> |
It was first described in 1932 for an occurrence at Bald Knob, [[Alleghany County, North Carolina]] near its namesakes, the town of [[Galax, Virginia]] and the [[plant]] [[galax]] which grows in the area.<ref name=Webmin/><ref name=HBM/> |
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It occurs in carbonate-rich [[Metamorphism|metamorphosed]] [[manganese]] ore deposits. It occurs associated with [[alleghanyite]], [[rhodonite]], [[sonolite]], [[spessartine]], [[tephroite]], [[kutnohorite]], [[manganhumite]], [[jacobsite]], [[kellyite]] and [[alabandite]] in the Bald Knob area. Associated minerals |
It occurs in carbonate-rich [[Metamorphism|metamorphosed]] [[manganese]] ore deposits. It occurs associated with [[alleghanyite]], [[rhodonite]], [[sonolite]], [[spessartine]], [[tephroite]], [[kutnohorite]], [[manganhumite]], [[jacobsite]], [[kellyite]] and [[alabandite]] in the Bald Knob area. Associated minerals include [[katoptrite]], [[magnetite]], [[manganostibite]], [[magnussonite]], [[tephroite]], manganhumite and [[manganosite]] in the Brattfors mine area of [[Nordmark]], [[Värmland]], [[Sweden]].<ref name=HBM/> |
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==References== |
==References== |
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Revision as of 08:10, 26 June 2013
| Galaxite | |
|---|---|
| General | |
| Category | Oxide minerals Spinel group Spinel structural group |
| Formula (repeating unit) | (Mn,Fe2+,Mg)(Al,Fe3+)2O4 |
| Strunz classification | 04.BB.05 |
| Crystal system | Cubic |
| Space group | Isometric (4/m 3 2/m) hexoctahedral |
| Unit cell | a = 8.271 Å; Z = 8 |
| Identification | |
| Color | Black, red-brown, red to yellow |
| Crystal habit | Octahedra and rounded grains and exolution blebs |
| Twinning | Spinel law with {111} as both twin and composition plane |
| Cleavage | Indistinct to none |
| Fracture | Conchoidal to irregular |
| Tenacity | Brittle |
| Mohs scale hardness | 7.5 |
| Luster | Vitreous |
| Streak | Red-brown |
| Diaphaneity | Opaque; may be translucent in thin section |
| Specific gravity | 4.234 |
| Optical properties | Isotropic |
| Refractive index | n = 1.923 |
| References | [1][2][3] |
Galaxite is a spinel mineral with the chemical formula (Mn,Fe2+,Mg)(Al,Fe3+)2O4.[2] It has a vitreous luster and is brownish red. It also leaves a brownish red streak. It is rated 7.5 on the Mohs Scale.[2]
It was first described in 1932 for an occurrence at Bald Knob, Alleghany County, North Carolina near its namesakes, the town of Galax, Virginia and the plant galax which grows in the area.[3][2]
It occurs in carbonate-rich metamorphosed manganese ore deposits. It occurs associated with alleghanyite, rhodonite, sonolite, spessartine, tephroite, kutnohorite, manganhumite, jacobsite, kellyite and alabandite in the Bald Knob area. Associated minerals include katoptrite, magnetite, manganostibite, magnussonite, tephroite, manganhumite and manganosite in the Brattfors mine area of Nordmark, Värmland, Sweden.[2]
References
- ^ Mindat.org
- ^ a b c d e Handbook of Mineralogy
- ^ a b Webmineral data
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