In the United States, a mining claim containing ore in veins or lodes, as
contrasted with placer claims carrying mineral, usually gold, in alluvium.
A rock made of pebbles of quartz with sand. Osborne
A group of plutonic rocks having the composition of diorite but with an
appreciable amount of quartz, i.e., between 5% and 20% of the
light-colored constituents; also, any rock in that group; the approximate
intrusive equivalent of dacite. AGI
See:quartz porphyry
Glass made by fusing quartz.
Gold that is not rounded and waterworn, but irregular and frequently
twisted in form, usually very bright, and always of fine quality.
Craigie
See:quartziferous
Quartz-bearing as applied to a rock not defined by the presence of quartz,
but containing minor amounts of it; e.g., limestone. Syn:quartzic
See also:quartzose
a. A derived quantity (qz) in the Niggli system of rock classification,
which may be either positive or negative, and is as indicator of a rock's
degree of silica saturation. AGI
b. A term used to indicate the mineralogic maturity of a sandstone by
measuring the percentage of detrital quartz. It is expressed as the ratio
of quartz and chert to the combined percentage of sodic and potassic
feldspar, rock fragments, and clay matrix. The index is used as a basis
for evaluating the degree of weathering of the source rock and the degree
to which the sediment has been transported. Values for sandstones range
between 3 and 19. AGI
a. A granoblastic metamorphic rock consisting mainly of quartz and formed
by recrystallization of sandstone or chert by either regional or thermal
metamorphism; metaquartzite. CF:orthoquartzite
b. A very hard but unmetamorphosed sandstone, consisting chiefly of quartz
grains that are so completely cemented with secondary silica that the rock
breaks across or through the grains rather than around them; an
orthoquartzite. AGI
c. Stone composed of silica grains so firmly cemented by silica that
fracture occurs through the grains rather than around them.
USBM, 7
d. As used in a general sense by drillers, a very hard, dense sandstone.
Long
e. A granulose metamorphic rock consisting essentially of quartz.
Holmes, 1
f. Sandstone cemented by silica that has grown in optical continuity
around each fragment. Syn:ganister
Of, pertaining to, or consisting of quartzite.
Altered sodic diabase (trachyte) with accessory quartz.
The extrusive or hypabyssal equivalent of a quartz monzonite. The
principal minerals are quartz, sanidine, biotite, sodic plagioclase, and
hornblende, commonly as phenocrysts in a groundmass of potash feldspar and
quartz (or tridymite, cristobalite), or glass in flows. Accessory minerals
are magnetite, apatite, and zircon.
A lode or vein of ore with quartz gangue.
In metallurgy, an apparatus for extracting gold from its ore. By the
action of an alkali and high-pressure steam, gold-bearing quartz is
converted into a soluble silicate from which gold may be separated by
washing. Standard, 2
A machine or establishment for pulverizing quartz ore, in order that the
gold or silver it contains may be separated by chemical means; a stamp
mill. Standard, 2; Fay
a. A mine in which the deposits of ore are found in veins or fissures in
the rocks forming the earth's crust. Usually applied to lode gold mines,
but not to placers.
b. A miner's term for a mine in which the valuable constituent, e.g. gold,
is found in siliceous veins rather than in placers. It is so named because
quartz is the chief accessory mineral. AGI
A medium- to coarse-grained plutonic rock containing major plagioclase,
orthoclase, and quartz, with minor biotite, hornblende, and accessory
apatite, zircon, and opaque oxides. Syn:adamellite
A crystal having the form of two six-sided pyramids base to base.
Standard, 2
A rock containing a large quantity of quartz. Gordon
a. Of, pertaining to, or consisting of quartz.
b. Containing quartz as a principal constituent; esp. applied to sediments
and sedimentary rocks (e.g., sands and sandstones) consisting chiefly of
quartz. CF:quartziferous