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G

Granodiorite

Igneous rock of medium grain size; contains abundant quartz and plagioclase over orthoclase; also dark coloured minerals (eg hornblende, biotite); an igneous rock with mineralogy intermediate between granite and diorite.

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Grain

  1. Degree of fineness or coarseness of texture.
  2. Quarrying term, cleavage.
  3. Direction along which igneous rocks can be split.
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Gabbro

Coarse-grained, plutonic rock, consisting essentially of calcic plagioclase and pyroxene, sometimes with olivine.

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