Quartz is the most common mineral found on the surface of the Earth. In hydrothermal veins, epithermal to alpine; characteristic of
granites and granite
pegmatites; in
sandstones and
quartzites, less abundant in other rock types; in hydrothermal metal deposits. Common in carbonate rocks; a residual mineral in soils and sediments (
Anthony et al., 2001—2005). There are faceted specimens of 7000 carats (
Arem, 1987: 159).
