Quarry:
A surface mine usually for the extraction of construction stone.
Quartz:
One of the most abundant minerals in the earth's crust. Has a chemical composition of SiO2 and a hardness of seven. One of the index minerals in Moh's Hardness Scale. Occurs in sedimentary, metamorphic and igneous rocks.
Quartz Arenite:
A sandstone consisting of at least 95% quartz.
Quartzite:
A metamorphic rock formed by the alteration of sandstone by heat, pressure and chemical activity. Picture of Quartzite.
Quartzose:
An adjective used in reference to a rock that is composted primarily of quartz.
Quicksand:
A bed of sand that has a high water content. The water within the sand is often flowing through the spaces between the sand grains. This creates a soft, fluid-like material that yields easily to pressure and in which heavy objects will sink.
Quicksilver:
A nickname for the element mercury.