gabbro |
| noun
- (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 |
| noun (plural gneisses)
- (geology) a common and widely-distributed metamorphic rock having bands or veins
| granite |
| noun
- 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:
- Soda-granite
- Quartz monzonite
| gravel |
| noun
- small, Small fragments of rock, used for laying on the beds of roads and railroads, and as ballast.
verb (gravell, ing)
- (transitive) To apply a layer of gravel to the surface of a road, etc.
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