1) Cal 2) Ore
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https://www.crosswordclues.com/clue/wolframite
1) Iron manganese tungsten 2) Manganese mineral 3) Mineral 4) The principal ore of tungsten 5) Tungstate mineral 6) Tungsten source
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https://www.crosswordclues.com/clue/wolframite
(Fe,Mn)WO4
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http://en.wikipedia.org/wiki/Glossary_of_geology
Wolframite, (Fe,Mn)WO4, is an iron manganese tungstate mineral that is the intermediate between ferberite (Fe2+ rich) and huebernite (Mn2+ rich). 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. Associated minerals inclu...
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http://en.wikipedia.org/wiki/Wolframite
• (n.) Tungstate of iron and manganese, generally of a brownish or grayish black color, submetallic luster, and high specific gravity. It occurs in cleavable masses, and also crystallized. Called also wolfram.
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http://thinkexist.com/dictionary/meaning/wolframite/
chief ore of tungsten, commonly associated with tin ore in and around granite. Such occurrences include Cornwall, Eng.; northwestern Spain and ... [2 related articles]
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http://www.britannica.com/eb/a-z/w/47
Wolframite. Credit: Mineral Information Institute Iron manganese tungstate (Fe, Mn)WO
4, the chief ore of tungsten. Wolframite forms brown to black monoclinic crystals, and is found with tin ores. China is the main producer.
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http://www.daviddarling.info/encyclopedia/W/wolframite.html
<chemical> Tungstate of iron and manganese, generally of a brownish or grayish black colour, submetallic luster, and high specific gravity. It occurs in cleavable masses, and also crystallized. ... Synonym: wolfram. ... Origin: G, wolframit, wolfram; wolf wolf + rahm cream, soot; cf. G. Wolfsruss wolfram, lit, wolf's soot. ... Source: Webster...
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http://www.encyclo.co.uk/local/20973
Wol'fram·ite noun [ G.,
wolframit ,
wolfram ;
wolf wolf +
rahm cream, soot; confer German
wolfsruss wolfram, lit., wolf's soot.]
(Min.) Tungstate of iron and manganese, generally of a brownish or grayish black color, submetallic luster, and high specific grav...
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http://www.encyclo.co.uk/webster/W/46
Wolframite is tungstate of iron and manganese, generally of a brownish or greyish black colour, sub-metallic lustre, and high specific gravity. It occurs in cleavable masses, and also crystallized. It is the most important tungsten ore and has a relative hardness of 5.
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http://www.probertencyclopaedia.com/browse/HW.HTM
[
n] - a mineral consisting of iron-manganese tungstate in crystalline form
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http://www.webdictionary.co.uk/definition.php?query=wolframite
iron manganese tungsten noun a mineral consisting of iron and manganese tungstate in crystalline form; the principal ore of tungsten; found in quartz veins associated with granitic rocks
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https://www.encyclo.co.uk/local/20974
Iron manganese tungstate, (Fe,Mn)WO
4, an ore mineral of tungsten. It is dark grey with a submetallic surface lustre, and often occurs in hydrothermal veins in association with ores of tin
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https://www.encyclo.co.uk/local/21221
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