Small, exceptionally clear, commonly doubly terminated quartz crystals in
Herkimer County, NY; in cavities in sandstone and in loose earth or clay;
also in mid-Atlantic beaches. Syn:Lake George diamond
See:Hall process
Copper-stained blue and green smithsonite from Albarradon, Mexico.
A mechanical, cylindrical, multiple-deck muffle furnace of the McDougall
type for smelting ores. Fay
A roller conveyor consisting of two parallel series of rolls having one or
both series skewed. See also:roller conveyor
Method used in flattish Rand stope panels 500 to 1,000 ft (152 to 305 m)
long for breaking and moving ore. Stope is divided into 20-ft (6.1-m)
panels, each worked by its own gang. A light tramming system delivers
severed rock to a central scraper system. Pryor, 3
See:herringbone roller conveyor
In mineral deposits, a pattern of alternating rows of parallel crystals,
each row in a reverse direction from the adjacent one. It resembles the
herringbone textile fabric. AGI
A syn. for "cycles per second." Abbrev. Hz.
S. Staff. Clinker from furnace boilers. Fay
A monoclinic mineral, 4[Ag2 Te] , with gold replacing silver toward
petzite; soft; metallic gray; fine grained, massive, or compact; sp gr,
8.24 to 8.45; in hydrothermal veins associated with quartz, pyrite, and
native gold; a source of silver in California, Colorado, Ontario, Mexico,
Chile, Romania, and Zimbabwe.
An orange to yellow-brown gem variety of grossular. Syn:essonite;
cinnamon stone.
a. A very rare double oxide of zinc and manganese, ZnMn23+
O4 , occurring in ore deposits as black tetragonal and fibrous
crystals; hausmannite family. CMD; Hey, 1
b. A tetragonal mineral, ZnMn2 O4 ; forms bipyramids; may be
fibrous; with zinc ores at Franklin, NJ, and near Leadville, CO. Also
spelled heterolite.
A prefix signifying various, or of more than one kind or form.
Pertaining to a type of crystalloblastic texture in a metamorphic rock in
which the essential mineral constituents are of two or more distinct
sizes. CF:crystalloblastic; homeoblastic. AGI
a. Having more than one constituent or phase, thus exhibiting different
properties in different portions. Pryor, 3
b. A term describing metals and alloys with structures composed of more
than one constituent. Rolfe
c. Unlike in character, quality, structure, or composition; consisting of
dissimilar elements or ingredients of different kinds; not homogeneous.
Standard, 2
a. A cobalt mineral, Co3+ O(OH) , containing up to 4% CuO.
Syn:stainierite
b. Name suggested for all cobaltocobaltic hydroxides of varying purity.
English
a. Said of the texture of a rock having crystals of significantly
different sizes.
b. Said of a rock having such a texture. Syn:inequigranular
c. See:anisodesmic
Said of igneous rocks having similar chemical composition but different
mineralogic composition. AGI
The crystallization of two magmas of nearly identical chemical composition
into two different mineral aggregates as a result of different cooling
histories. AGI
Said of sedimentary rocks of different facies, or said of facies
characterized by different rock types. The rocks may be formed
contemporaneously or in juxtaposition in the same sedimentation area or
both, but the lithologies are different; e.g., facies that replace one
another laterally in deposits of the same age. Also, said of a map
depicting heteropic facies or rocks. CF:isopic