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Hypobatholithic Deposit
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A mineral deposit found in a deeply eroded mass of intrusive rock with few roof pendants remaining.
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Hyper
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A prefix from the Greek meaning over, above, or abnormally great.
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Hypidiomorphic Texture
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A texture of igneous rocks in which the greater proportion of the crystallized minerals have subhedral forms.
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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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Hyperfusible
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Any substance capable of lowering the melting ranges in end-stage magmatic fluids.
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Hydrothermal Synthesis
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Mineral synthesis in the presence of water at elevated temperatures.
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Hypogene Ore
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Ore deposited from ascending hydrothermal solutions of magmatic origin.
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Hypersthenite
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Originally defined as a syn. of norite, but now commonly used to mean a rock composed entirely of hypersthene; an orthopyroxenite. Not recommended usage.
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Hypabyssal
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Pertaining to an igneous intrusion, or to the rock of that intrusion, whose depth is intermediate between that of abyssal or plutonic and the surface. This distinction is not considered relevant by some petrologists.
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Hydrothermal Stage
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That stage in the cooling of a magma during which the residual fluid is strongly enriched in water and other volatiles. The exact limits of the stage are variously defined by different authors, in terms of phase assemblage, temperature, composition, and/or vapor pressure; most definitions consider it as the last stage of igneous activity, coming at a later time, and hence at a lower temperature, than the pegmatitic stage.
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