![](http://www.alamy.com/thumbs/6/8A6FAD3D-E344-4FCD-89FF-2F3B004EAF05/2F3J7JJ.jpg)
wolframite, a tungsten cousin used in lightbulb filament manufacturing
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Photo credit: © WireStock / Alamy / Afripics
License: Royalty Free
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Keywords: black, bulb, collection, crystal, ferberite, filament, gaslight, gem, gemstone, geology, incandescent, iron, light, lightbulb, manganese, manufacturing, metal, metallic, mineral, minerology, natural, ore, precious, rock, sample, scheelite, science, silicate, specimen, stone, tungstate, tungsten, tunstate, wolfram, wolframite