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A milled sixpence; -- the sixpence being one of the first English coins milled (1561).
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A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity.
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A mineral occuring at Vesuvius, in glassy agonal crystals; also elsewhere, in grayish or greenish masses having a greasy luster, as the variety elaeolite. It is a silicate of aluminia, soda, and potash.
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A mineral occurring in pale yellow or brownish hexagonal crystals. It is an arseniate of lead.
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A mineral occurring in soft, lead-gray, foliated masses or scales, resembling graphite; sulphide of molybdenum.
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A mineral occurring in transparent crystals, usually of a white, sometimes of a reddish gray, or lemon-yellow, color; native sodium nitrate. It is used in making nitric acid and for manure. Called also soda niter.
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