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Result search of : G
Title Description
 Gold Mine   
A mine containing or yielding gold. It may be either in solid rock (quartz mine) or in alluvial deposits (placer mine).  
 Gin Pit   
A shallow mine, the hoisting from which is done by a gin. 
 Geologic-time Scale   
Chronological sequence of units of earth time. 
 Geode   
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.
 
 Gas    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. 
 Gold Milling   A general term applied to the treating of ore to recover gold and silver therefrom.  
 Glance   A mineral having a splendant luster, e.g., chalcocite (copper glance). 
 Gismondine   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.  
 G Stone   A name which has been used for pyrophyllite. 
 Glass Sand   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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