Word: feldspar
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...business twelve years ago when demand for paving granite from their quarry fell off. Since chickens have no teeth, they masticate their food in their gizzards, with the help of pebbles they swallow while feeding. The Davidsons claim that their grit is ideal because it contains sparkling particles of feldspar and mica which attract a hungry...
...Tariff Commission's recommendation President Hoover last week upped the duty on green peas (3? to 3.9? per lb.) and McKay sewed shoes (20% to 30%). He downed the duty on egg plant (3? to 1½? per lb.), green peppers (3? to 2½? per lb.), crude feldspar ($1 to 50? per ton), turned shoes (20% to 10%), window glass (25%). He left unchanged the tariff on (among other things), lumber, cement, pens, Spanish moss, pineapples, snap beans, cucumbers, okra, fresh tomatoes and lima beans...
Near Rumney Depot is the Ruggles sheet-mica mine, oldest in the U. S. Found in combination with mica are beryl, feldspar...
...been manufactured by a slow electrolytic process. The Schwarz process is a heat treatment. From a ton of beryl ore costing $100, Metallurgist Schwarz says he can obtain 100 Ib. of pure beryllium. The ore is plentiful in New Hampshire. New York, the Carolinas, Colorado, usually being found with feldspar deposits...
...lump of fused quartz, clear as water, turned purple; a lump of feldspar glowed blue, amber, ruby, amethyst, with patches of brilliant green, successively; a lump of limestone burned angry orange. After exposure to the rays, these minerals looked searing hot but were not. Their fluorescence was without rise in temperature and in some cases persisted for hours after the exposure (as displaced electrons worked slowly back to their places in the atoms). The application of heat and cold (liquid air) altered the speed and intensity of these effects. Diamonds were only temporarily affected by exposure...