Cassiterite sentence example

cassiterite
  • The tin occurs in the form of cassiterite, and is found chiefly in or near the crystalline rocks, especially the granite.

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  • The granite, which is intruded through the Eocene beds, is associated with a pegmatite containing tourmaline and cassiterite.

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  • Of minerals containing this element mention may be made of cassiterite or tinstone, Sn02, tin pyrites, Cu 4 SnS 4 + (Fe,Zn) 2 SnS 4; the metal also occurs in some epidotes, and in company with columbium, tantalum and other metals.

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  • Zirconia can be obtained crystalline, in a form isomorphous with cassiterite and rutile, by fusing the amorphous modification with borax, and dissolving out with sulphuric acid.

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  • It is an amorphous white powder; but it may also be obtained in crystals isomorphous with cassiterite by heating the amorphous form with borax to a very high temperature.

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  • It occurs in metalliferous veins, often in association with iron-pyrites, chalybite, blende, &c., and in Cornwall and Devon, where it is abundant, with cassiterite.

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  • Alluvial tin mining is carried on successfully in the neighbourhood of Embadaan, cassiterite to the value of £46,000 being exported in 1905-1907.

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  • Mining for alluvial cassiterite continued right up to the 20th century but was at its maximum in the middle ages.

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  • Placer cassiterite is free of deleterious minerals and is easy to recover having a high specific gravity.

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  • Rutile assumes tetragonal forms isomorphous with cassiterite, SnO 2 (and also zircon, ZrSiO 4); anatase is also tetragonal, and brookite or thorhombic. Rutile is the most stable and anatase the least, a character reflected in the decrease in density from rutile (4.2) and brookite (4.0) to anatase (3.9).

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