Back فولفراميت Arabic Volframit AZ Вальфраміт BE Волфрамит Bulgarian Wolframita Catalan Wolframit Czech Wolframit German Βολφραμίτης Greek Volframito EO Wolframita Spanish
| Wolframite | |
|---|---|
 | |
| General | |
| Category | Oxide minerals |
| Formula (repeating unit) | (Fe,Mn)WO4 |
| Crystal system | Monoclinic |
| Crystal class | Prismatic (2/m) (same H-M symbol) |
| Space group | P2/c |
| Unit cell | a = 4.77 Å, b = 5.73 Å c = 4.98 Å; β = 90.2°; Z = 2 |
| Identification | |
| Color | Grayish to brownish black |
| Crystal habit | Tabular to short prismatic crystals |
| Cleavage | Perfect {010} |
| Fracture | Uneven to rough |
| Mohs scale hardness | 4–4.5 |
| Luster | Submetallic to resinous |
| Streak | Reddish brown |
| Diaphaneity | Opaque |
| Specific gravity | 7–7.5 |
| Fusibility | 3–4 to magnetic globule |
| References | [1][2][3] |
Wolframite is an iron, manganese, and tungstate mineral with a chemical formula of (Fe,Mn)WO4 that is the intermediate mineral between ferberite (Fe2+ rich) and hübnerite (Mn2+ rich).[4] Along with scheelite, the wolframite series are the most important tungsten ore minerals. Wolframite is found in quartz veins and pegmatites associated with granitic intrusives.[5] Associated minerals include cassiterite, scheelite, bismuth, quartz, pyrite, galena, sphalerite, and arsenopyrite.
This mineral was historically found in Europe in Bohemia, Saxony, and in the UK in Devon and Cornwall. China reportedly has the world's largest supply of tungsten ore with about 60%.[6] Other producers are Spain, Canada, Portugal, Russia, Australia, Thailand, South Korea, Rwanda, Bolivia, the United States, and the Democratic Republic of the Congo.[7]
- ^ Barthelmy, Dave. "Wolframite Mineral Data". webmineral.com.
- ^ "Wolframite: Wolframite mineral information and data". www.mindat.org.
- ^ Klein, Cornelis and Cornelius S. Hurlbut, Jr., Manual of Mineralogy, Wiley, 20th ed. 1985, pp. 355-356 ISBN 0-471-80580-7
- ^ King, R.J. (2005-03-01). "Minerals explained 41". Geology Today. 21 (1): 33–37. Bibcode:2005GeolT..21...33K. doi:10.1111/j.1365-2451.2005.00493.x. ISSN 0266-6979.
- ^ Haldar, S. K. (2020). Introduction to mineralogy and petrology. Amsterdam: Elsevier. ISBN 978-0-323-85136-7. OCLC 1181840467.
- ^ "USGS Circular 930–O: International Strategic Mineral Issues Summary Report—Tungsten". pubs.usgs.gov. Retrieved 2023-02-10.
- ^ "Clean them up". The Economist. 19 August 2010.