Tungsten Mineral Species
- Details
- Category: Tungsten Information
- Published on Monday, 04 January 2016 16:50
In the mineralization, most majority of tungsten forms into oxides (tungstate) , rarely sulfide, no natural tungsten. Currently it’s found only about 20 species of tungsten ores and minerals containing tungsten in the crust.
Wolframite family: huebnerite, ferberite, wolframite;
Scheelite family: scheelite (calcium tungstate mineral), seyrigite, cuproscheelite;
Tungstite minerals: tungstite, meymacite, ferritungstite, yttrotungstite, cuprotungstite, anthoinite;
Unusual tungsten minerals: stolzite, raspite, sanmartinite, russellite, scheteligite, yttrocrasite (tungsten) and tungstenite.
Wolframite (wolframite) and scheelite (calcium tungstate mineral) have most industrial value.
|
Minerals |
Huebnerite |
Wolframite |
Ferberite |
Scheelite |
|
Formula |
MnWO4 |
(FeMn)WO4 |
FeWO4 |
CaWO4 |
|
WO3 % |
76.5 |
76.6 |
76.3 |
80.6 |
|
Crystal System |
monoclinic |
monoclinic |
monoclinic |
square |
|
Cleavage |
Along the oblique plane |
Along the oblique plane |
Along the oblique plane |
Parallel to the cone |
|
Mohs Hardness |
5-5.5 |
5-5.5 |
4-4.5 |
4.5-5 |
|
Density |
7.2-7.5 |
7.1-7.5 |
6.8 |
5.9-6.2 |
|
Magnetism |
weak |
weak |
weak |
no |
Wolframite formed iron tungstate and manganese tungsten transition minerals with same crystal structure, from which manganese and iron two elements can replace each other indefinitely. When content of manganese is relatively large (greater than 17.6%), huebnerite is formed; when content of manganese is fewer (less than 5.9%), ferberite is formed; when content of manganese is in between, wolframite is formed. The WO3 content of above three wolframites is more than 70%.
Color wolframite are dark gray, reddish brown, light brown black, taupe and iron brown and other colors, with a submetallic luster, metallic luster and resinous luster. It is monoclinic, brittle, with irregular-shaped fracture. Wolframite is usually leaf-shaped, curved flake, granular and compact shape, and some were thick plate, pointed columnar form distribution, often with white quartz vein together to form filled in and near the law granite rock crevices .
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