See:quartzose
A field term for a medium-grained porphyritic igneous rock of felsic but
unspecified composition occurring normally as minor stock or dike
intrusions, and carrying prominent phenocrysts of quartz. It is a common
altered companion to porphyry copper deposits. Syn:quartz felsite
A lode or vein of quartz. See also:reef
Siliceous sinter. Fay
A potash or soda syenite with quartz as an accessory, hence on the
borderline between syenite and granite.
A fine-grained igneous rock consisting mostly of alkali feldspar, with
normative quartz between 5% and 20%; the volcanic equivalent of quartz
syenite. It normally shows trachytic texture. AGI
a. An optical accessory with varying retardation used in polarized-light
microscopy to determine birefringence and optic sign.
CF:Berek compensator
b. In polarized-light microscopy, an accessory plate that gives variable
compensation for birefringence. CF:accessory plate; gypsum plate.
See:quartzose
The second period of the Cenozoic era, following the Tertiary; also, the
corresponding system of rocks. It began 2 to 3 million years ago and
extends to the present. It consists of two grossly unequal epochs; the
Pleistocene, up to about 10,000 years ago, and the Holocene since that
time. The Quaternary was originally designated an era rather than a
period, with the epochs considered to be periods, and it is still
sometimes used as such in the geologic literature. The Quaternary may also
be incorporated into the Neogene, when the Neogene is designated as a
period of the Tertiary era. AGI
An alloy containing four principal elements. Rolfe
See:quene
Aqueous extract of a bark of quebracho tree; contains up to 65% tannin.
Used in froth-flotation as depressant for oxidized minerals.
Pryor, 3
Slate measuring 36 in by 24 in (91.44 cm by 60.96 cm). Pryor, 3
A fissure, joint, or small cavity in a rock or quartz vein. Also spelled
quere, queere, and qweear (U.K.).
Corn. When the lode or rock on which the miner is driving partakes of the
character of quarry stone, namely, in detached lumps by natural divisions,
it is called queery ground, and is frequently worked with crowbars and
levers instead of being blasted or gadded. A "queer of ground" is a
detached rock. Also called quarry lode. See also:queer
a. To cool suddenly (as heated steel) by immersion, esp. in water or oil.
Webster 3rd
b. To produce a crust or a succession of crusts on molten metal, each
crust being removed as it is formed. Standard, 2
Generally means rapidly cooling metals and alloys, or any substance to
below the critical range by immersing it in oil or water to harden it.
Also applied to cooling in salt and molten-metal baths or by means of an
air blast, and to the rapid cooling of other alloys after solution
treatment. CTD
Oils used in heat treating. Fish oils are often used. Minerals, fish,
vegetable, and animal oils are often compounded and sold under trade
names. Crispin
A tub of water in which to cool, harden, or temper iron or steel.
Standard, 2
Crevice in lode or vein. Also spelled queane. Hess
A monoclinic mineral, PbMnO2 (OH); occurs in pitch-black crystals
with perfect cleavage; at Laangban, Sweden.