a. Som. A long and deep holing, cutting, or jud, made for the purpose of
detaching large blocks of stone from their natural beds.
b. Prov. Eng. To undercut (coal or rock). Standard, 2
A microcrystalline gem variety of jadeite or nephrite (actinolite) with a
toughness (resistance to breakage) exceeded only by that of carbonado
diamond; ranges from nearly white to emerald-green, the latter being the
most valuable; finest quality is reported to come from northern Burma
(Myanmar) and the Yunnan Province of south China. The emerald-green color
is attributed to jadeite and to trace amounts of chromium. There are many
imitations of jade, including green-dyed onyx (Mexican jade), aventurine
quartz containing fuchsite mica (Indian jade), vesuvianite (California
jade), green hydrogrossular from South Africa, green organic or inorganic
dyes or substitutes inserted under white jade, glass, dyed quartz, and
bowenite or williamsite varieties of serpentine. "Jade cat's-eye" is a
contradiction in terms. See:jadeite; nephrite; toughness.
A monoclinic mineral, 4[NaAlSi2 O6 ] ; pyroxene group; apple
green to emerald green, white, lavender, tomato red, or brown; tough;
associated with albite from high-pressure, low-temperature metamorphosed
plagioclase; an ornamental stone called "jade" (along with nephrite).
A metamorphic rock consisting principally of jadeite, commonly associated
with small amounts of feldspar or feldspathoids. It is probably derived
from an alkali-rich igneous rock by high-pressure metamorphism.
AGI
A deep-green chromiferous syenite cut as a gemstone and resembling jade in
appearance. Obsolete. AGI
An anchor bolt with a barbed flaring shank, which resists retraction when
leaded into stone or set in concrete. Also called hacked bolt; rag bolt.
Webster 3rd
A bluish-white diamond of modern cut. Schaller
An inclined board on which ore slimes are washed, as in a buddle.
Standard, 2
A trigonal mineral, Pb3 FeSi4 O12 (Cl,OH) ; in
yellow-green micaceous plates associated with another lead-iron silicate
(melanotekite) in iron ore at Laangban, Sweden.
Som. A small tub or box in which water is carried in a mine.
A tetragonal mineral, Ag3 CuS2 ; forms intergrowths with
argentite in the Black Hawk District, Grant County, NM.
The blocking of a core barrel or core bit with core, sometimes
deliberately. Long
a. A vein or bed of earth or stone, that prevents miners from following a
vein of ore; a large block. Fay
b. A projecting columnar part (as of a masonry wall) or mass (as of ore).
Webster 3rd
c. A vertical structural member forming the side of an opening in a
furnace wall. Harbison-Walker
d. A type of brick shape intended for use in the sides of wall openings.
Harbison-Walker
e. Sidewall of port of furnace superstructure carrying port crown load.
ASTM
In the coke products industry, a laborer who chips carbon and mud from the
edges of coke-oven doors with a steel bar prior to the discharge of the
coke. DOT
See:gim peg
See:breast wall
Movable sieve box supported on a rubber diaphragm and jigged mechanically
up and down. Pryor, 3
A monoclinic mineral, 2[Pb4 FeSb6 S14 ] ; metallic
gray to black; in acicular crystals or capillary forms of featherlike
appearance, thus the term "feather ore;" in low- to medium-temperature
veins with other lead sulfosalts, galena, and carbonates.
Syn:wolfsbergite; feather ore.
Shaking table used in concentration of ground ores by gravity.
Pryor, 3
S. Staff. To cut or knock away the coal between holes. Fay
A riveting hammer provided with an air-operated telescopic casing to hold
the hammer against the work. Hammond