1) Cogwheelore
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https://www.crosswordclues.com/clue/bournonite
1) Lead mineral 2) Orthorhombic mineral
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https://www.crosswordclues.com/clue/bournonite
Bournonite is a sulfosalt mineral species, a sulfantimonite of lead and copper with the formula PbCuSbS3. It was first mentioned by Philip Rashleigh in 1797 as an ore of antimony and was more completely described in 1804 by French crystallographer and mineralogist Jacques Louis, Comte de Bournon (1751–1825), after whom it was named. The name giv...
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http://en.wikipedia.org/wiki/Bournonite
• (n.) A mineral of a steel-gray to black color and metallic luster, occurring crystallized, often in twin crystals shaped like cogwheels (wheel ore), also massive. It is a sulphide of antimony, lead, and copper.
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http://thinkexist.com/dictionary/meaning/bournonite/
sulfosalt mineral, a lead, copper, and antimony sulfide (PbCuSbS3), that occurs as heavy, dark crystal aggregates and masses with a metallic lustre ...
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http://www.britannica.com/eb/a-z/b/100
Bour'non·ite noun [ Named after Count
Bournon , a mineralogist.]
(Min.) A mineral of a steel- gray to black color and metallic luster, occurring crystallized, often in twin crystals shaped like cogwheels (wheel ore), also massive. It is a sulphide of antimony, lead, and copper.
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http://www.encyclo.co.uk/webster/B/86
Bournonite, named after the mineralogist Count Bournon, is an ore of lead, copper, and antimony which often exhibits twinned crystals. It occurs in veins formed at moderate temperatures and has the formulae PbCuSbS3 and a relative hardness of 3.
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http://www.probertencyclopaedia.com/browse/HB.HTM
a sulfide of lead, antimony, and copper, PbCuSbS, occurring in gray to black crystals or granular masses. Also called
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https://www.infoplease.com/dictionary/bournonite
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