Word: feldspar
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Dates: during 1930-1939
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...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...