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Glossary of Petrography - Rocks, Minerals Terms
beginning with letter G
Browse the Petrography - Rocks, Minerals Glossary
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gabbro Tweet Definition of gabbro Like Definition of gabbro on Facebook
noun 
  1. (geology) A name originally given to a kind of serpentine, and now generally used for a coarsely crystalline, igneous rock consisting of lamellar pyroxene and labradorite.
     
gneiss Tweet Definition of gneiss Like Definition of gneiss on Facebook
noun (plural gneisses)
  1. (geology) a common and widely-distributed metamorphic rock having bands or veins
     
granite Tweet Definition of granite Like Definition of granite on Facebook
noun 
  1. A group of igneous and plutonic rocks composed primarily of feldspar and quartz. Usually contains one or more dark minerals, which may be mica, pyroxene, or amphibole. Granite is quarried for building stone, road gravel, decorative stone, and tombstones. Common colors are gray, white, pink, and yellow-brown.
  • Varieties:
    1. Soda-granite
    2. Quartz monzonite
     
gravel Tweet Definition of gravel Like Definition of gravel on Facebook
noun 
  1. small, Small fragments of rock, used for laying on the beds of roads and railroads, and as ballast.
verb (gravell, ing)
  1. (transitive) To apply a layer of gravel to the surface of a road, etc.
     
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