wolframite
Dark tungstate mineral
Wolframite is a brownish-black mineral that serves as a major ore of tungsten.
It occurs in granite and pegmatite formations, typically appearing as heavy, blade-like crystals.
The name comes from wolfram, an older term for tungsten still used in some languages and preserved in tungsten's chemical symbol, W.
Metal-bearing rock
- cassiteritePrincipal tin oxide ore
- quartzCrystalline silicon dioxide
- pyriteBrass-yellow iron sulfide
- galenaSulfide ore of lead
crystal · vein · deposit · lode · placer · mineralogy · geology · specimen
Absence of light
- blackDarkest possible hue
- brownishSomewhat earth-colored
- metallicResembling ore-based elements
- opaqueImpassable to light
tabular · prismatic · bladed · striated · heavy · dense · massive · granular
Extracting metal from ore
- flotationAbility to stay afloat
- roastingCooking with dry heat
- leachingDissolving out by liquid
- refiningRemoving unwanted elements
concentrate · tailings · crusher · mill · processing · mining · underground · open-pit
Very thin thread
- carbideCarbon-bonded metal compound
- hardnessResistance to penetration
- alloyMetallic combination
- high-temperatureVery great heat
armor-piercing · electrode · refractory · density · strategic · industrial · machining · wear-resistant
ore
Metal-bearing rock
- cassiteritePrincipal tin oxide ore
- quartzCrystalline silicon dioxide
- pyriteBrass-yellow iron sulfide
galena · crystal · vein · deposit · lode · placer · mineralogy · geology · specimen · streak
dark
Absence of light
opaque · tabular · prismatic · bladed · striated · heavy · dense · massive · granular
smelting
Extracting metal from ore
refining · concentrate · tailings · crusher · mill · processing · mining · underground · open-pit · slag
filament
Very thin thread
high-temperature · armor-piercing · electrode · refractory · density · strategic · industrial · machining · wear-resistant