Mancil Tweed Feldspar QuarryLocation: Cecil County |
At the fork in the road, three-eighths of a mile east of Rock Springs, are two feldspar openings in a vein some six to eight feet wide, which have been abandoned for three years. They are known as the Tweed quarry and the Riley quarry. The serpentine bordering the vein has altered to talc. In the spring of 1901 a productive opening was made close to the abandoned Tweed quarry. The vein strikes N S0° E. The spar is hauled to Conowingo and thence shipped to Trenton. (Bascom F., 1902. The Geology of the Crystalline Rocks of Cecil County)
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