Granite is described as a coarse grained igneous rock containing the minerals mica, quartz and feldspar.

Glucose pertains to the simple sugar (monosaccharide) that serves as the chief source of energy in the body.

Glass Packaging Institute (GPI) is an organization composed of glass container producers. GPI establishes policies, such as standardization and develops industry advertising programs.

Gillnet is a type of net whose mesh size allows the heads of fish to pass through the openings but the gills get caught, and they are placed vertically in the water.

Galvanometer scanner is a motorized mirror mounts used in scanning applications. They are different than electrical measuring devices called galvanometers.