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Gold Mine
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A mine containing or yielding gold. It may be either in solid rock (quartz mine) or in alluvial deposits (placer mine).
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Gin Pit
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A shallow mine, the hoisting from which is done by a gin.
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Geologic-time Scale
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Chronological sequence of units of earth time.
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Geode
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Roughly spherical, hollow or partially hollow accumulation of mineral matter from a few centimeters to nearly 0.5 m in diameter. Outer layer of chalcedony lined with crystals that project toward hollow center. Crystals, often perfectly formed, usually quartz although calcite and dolomite also found and - more rarely - other minerals. Geodes most commonly found in limestone and more rarely in shale.
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Gas
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In geology "gas" is sometimes used to refer to natural gas, gaseous hydrocarbons that occur in rocks, dominated by methane. Compare "oil," referring to petroleum.
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Gold Milling
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A general term applied to the treating of ore to recover gold and silver therefrom.
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Glance
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A mineral having a splendant luster, e.g., chalcocite (copper glance).
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Gismondine
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A monoclinic mineral, Ca2 Al4 Si4 O16 .9H (sub 2) O ; zeolite group; pseudotetragonal; vitreous, transparent to translucent; in cavities in leucitic tephrites and related lavas; also zeolite zones in basaltic lavas where it is associated with chabazite, thomsonite, and phillipsite. Also spelled gismondite.
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G Stone
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A name which has been used for pyrophyllite.
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Glass Sand
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A sand that is suitable for glassmaking because of its high silica content (93% to 99%) and its low content of iron oxide, chromium, cobalt, and other colorants.
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