a mineral formed from igneous rock, is the most abundant mineral
found on the crust of the earth. It makes up 12% of the earth's
is a major component of sand and granite.
quartz crystals are known to exist.
appears in both macrocrystalline and microcrystalline
crystal is a macrocrystalline form.
properties are used for controlling frequencies in
watches, quartz movement clocks and radio transmitters.
is a raw material for glass and ceramics industries.
has a trigonal