Wodginite
| Wodginite | |
|---|---|
| File:Cassiterite-Wodginite-md36b.jpg Wodginite over cassiterite | |
| General | |
| Category | Oxide - Tantalate mineral |
| Formula | Mn2+(Sn,Ta)Ta2O8 |
| IMA symbol | Wdg[1] |
| Strunz classification | 4.DB.40 |
| Dana classification | 08.01.08.01 |
| Crystal system | Monoclinic |
| Crystal class | Prismatic (2/m) (same H-M symbol) |
| Space group | C2/c (no. 15) |
| Identification | |
| Color | Reddish brown, dark brown to black |
| Crystal habit | Flattened dipyramidal to prismatic crystals in radiating groups; granular, massive. |
| Twinning | Very common as penetration twins |
| Cleavage | none |
| Fracture | Irregular |
| Tenacity | Brittle |
| Mohs scale hardness | 5.5 |
| Luster | Sub-metallic |
| Streak | Brown |
| Diaphaneity | Opaque, translucent in thin fragments |
| Specific gravity | 7.19–7.36 |
| References | [2][3][4][5] |
Wodginite is a manganese, tin, tantalum oxide mineral with the chemical formula Mn2+(Sn,Ta)Ta2O8. It may also include significant amounts of niobium.[2][3]
Background
[edit | edit source]Wodginite was first described in 1963 for an occurrence in the Wodgina pegmatite, Wodgina, Pilbara Region, Western Australia.[4]
Typical occurrence of wodginite occurs in zoned pegmatites in amphibolite. It is associated with tantalite, albite, quartz, muscovite, tapiolite, microlite and microcline.[2]
It occurs in pegmatites in a wide variety of locations. The most studied is the Tanco pegmatite in Manitoba, Canada; also in Red Lake, Ontario. It is reported from the Strickland quarry, Portland, Middlesex County, Connecticut; the Herbb #2 pegmatite, Powhatan County, Virginia; the McAllister mine, Rockford, Coosa County, Alabama; the Peerless mine, Pennington County, South Dakota. Also from Paraíba and Minas Gerais, Brazil; Krasonice, Czech Republic; Orivesi, Finland; Kalba, eastern Kazakhstan; Ankole, Uganda; Miami district, Zimbabwe and Karibib and Kohero, Namibia.[2][4]
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References
[edit | edit source]
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- ^ a b c d Handbook of Mineralogy
- ^ a b Webmineral data
- ^ a b c Mindat.org
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