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Nacreous
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Adj. Applied to the luster of certain minerals, usually on crystal faces parallel to a good cleavage, the luster resembling that of pearls
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Quarry Powder
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Ammonium nitrate dynamites intended to replace the more costly gelatin dynamites used in quarrying, where blasts of several tons of explosives are used. Cartridges up to 8 in (20 cm) in diameter by 21 in (53 cm) in length, can be enclosed in metal cans to protect against water damage.
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Quaternary Alloy
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An alloy containing four principal elements.
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Nystagmus
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An eye disease suffered by some miners, in which there is a spasmodic oscillatory movement of the eyeballs; in severe cases, the victim finds difficulty in walking straight. Bad lighting is generally believed to be the main cause, and is possibly aggravated by the workers lying on their sides in thin seams
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Nystagmus
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An eye disease suffered by some miners, in which there is a spasmodic oscillatory movement of the eyeballs; in severe cases, the victim finds difficulty in walking straight. Bad lighting is generally believed to be the main cause, and is possibly aggravated by the workers lying on their sides in thin seams.
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Hypabyssal Rock
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An igneous rock that has risen from the depths as magma but solidified mainly as such minor intrusions as dikes and sills.
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Seismometer
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An instrument that detects Earth motions. Syn: seismic detector CF: geophone; hydrophone; seismograph.
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Myrmekite
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An intergrowth of plagioclase feldspar (commonly oligoclase) and vermicular quartz, generally replacing potassium feldspar; formed during the later stages of consolidation in an igneous rock or during a subsequent period of plutonic activity. The quartz occurs as blobs.
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Magmatic Ore Deposit
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An ore deposit formed by magmatic segregation, generally in mafic rocks and layered intrusions, as crystals of metallic oxides or from an immiscible sulfide liquid. Syn: magmatic deposit
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Orthoclasite
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An orthoclase-bearing porphyritic intrusive rock, such as granite or syenite. The term is sometimes restricted to rocks containing more than 90% orthoclase. Not recommended usage
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