The large, deep, cast-iron box into which the stamps fall and the ore is
fed in a gold or silver stamp mill; also called stamper box. Fay
A structure in crystalline rocks characterized by an aggregate of small
grains of quartz and feldspar occupying the interstices between, or
forming borders on the edges of, much larger, rounded grains of the same
minerals. Long considered a product of cataclasis, the structure may
actually be the result of plastic deformation and dynamic
recrystallization (Harte, 1977). Syn:porphyroclastic structure
See also:cataclastic
See:mortise
Destruction of active qualities, as in mercury amalgamation.
Standard, 2
A rectangular hole cut in one member of a framework to receive a
corresponding projection on the mating member. Syn:mortice
a. Fr. Barren or dead ground.
b. The water-bearing strata overlying the Coal Measures.
a. An assembly of aerial or space photographs or images whose edges have
been feathered and matched to form a continuous photographic
representation of a part of the Earth's surface; e.g., a composite
photograph formed by joining together parts of several overlapping
vertical photographs of adjoining areas of the Earth's surface.
See also:controlled mosaic
b. A textural subtype in which individual mineral grains are approx. equal
(Harte, 1977). AGI
An amalgam of mercury, tin, and bismuth, used for imitating silverwork.
Standard, 2
Slight irregularity of orientation of small, angular, and granular regions
of varying sizes in a crystal.
a. A granoblastic texture in a dynamically metamorphosed rock in which the
individual grains meet with straight or only slightly curved, but not
interlocking or sutured, boundaries. AGI
b. A texture in a crystalline sedimentary rock characterized by more or
less regular grain-boundary contacts; e.g., a texture in a dolomite in
which the mineral dolomite forms rhombs of uniform size so that in section
contiguous crystals appear to dovetail, or a texture in a orthoquartzite
in which secondary quartz is deposited in optical continuity on detrital
grains. AGI
An isometric mineral, Ag2 Hg3 ; a silver-white amalgam; sp
gr, 13.5. Named for the locality in Bavaria, Germany.
An isometric mineral, Hg2 N(Cl,SO4 ,MoO4 ,CO3
).H2 O ; yellow; secondary. See also:kleinite
a. adj. A fine dendritic growth having the texture of moss; e.g., moss
gold.
b. A term used for fractures or fissures in gem stones which produce the
appearance of moss, such as in many emeralds.
A general term for any translucent chalcedony containing inclusions of any
color arranged in dendritic patterns resembling trees, ferns, leaves,
moss, and similar vegetation; specif. an agate containing brown, black, or
green mosslike markings due to visible inclusions of oxides of manganese
and iron. See also:agate; Mocha stone; tree agate.
Syn:landscape agate; medfordite.
A scraper-box type of coal loader developed at the Mossfield colliery
(Great Britain) in 1953. It consists of a hinged front, scooplike plate
which elevates and deflects the broken coal onto an armored conveyor. On
inclined faces, the loader is hauled by a double-drum Pikrose haulage.
Nelson
A material in dendritic forms.
During low water in the Salmon River, CA, the algae and other plants
growing in the stream are gathered, dried, and burned. The ashes are
washed, and some gold is obtained. This process is called mossing.
Hess
A tantalum-bearing variety of ferrocolumbite or tapiolite named for the
locality in Norway.
Peat derived from water-loving mosses, chiefly sphagnum.
See also:highmoor peat
Granulated zinc obtained when the molten metal is poured into cold water.
a. Gouge clay in a mineral vein. Arkell
b. Shale adhering to quarried limestone. Arkell
c. See:mother crystal