Online Encyclopedia

WULFENITE

Online Encyclopedia
Originally appearing in Volume V28, Page 855 of the 1911 Encyclopedia Britannica.
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WULFENITE  , a

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mineral consisting of
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lead molybdate, PbMoO4, crystallizing in the
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hemimorphic-
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tetartohedral class of the tetragonal
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system . Crystals usually have the
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form of thin square plates bevelled at the edges by pyramidal planes . They have a brilliant resinous to adamantine lustre, and vary in
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colour from greyish to
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bright yellow or red: the hardness is 3, and the specific gravity 6.7 . Small amounts of
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calcium are sometimes
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present isomorphously replacing lead . The mineral occurs in
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veins of lead ore, and was first found in the 18th
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century in the lead mines at Bleiberg in
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Carinthia . Bright yellow crystals are found in New
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Mexico and
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Utah, and brilliant red crystals in
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Arizona .

End of Article: WULFENITE
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WULFHERE (d. 675)

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