An axial rotation of 360 degrees , one-fold. See also:axis of symmetry
A residual hill rising above a peneplain, representing an isolated remnant
of a former erosion surface. It is named after Mt. Monadnock, NH.
CF:inselberg
a. A monoclinic mineral, (Ce,La,Y,Th)PO4 ; waxy yellow to brown; an
accessory in granites; pegmatites, and placers; a source of thorium and
rare earths; further speciated according to the dominant rare-earth
element. See also:zircon group
b. The mineral group brabandite, cheralite, huttonite, monazite, and
rooseveltite.
See:monazite
A trigonal mineral, (Te,Bi)2 ; melonite group; steel-gray; in
chalcopyrite on the Kola Peninsula, Russia.
A lamprophyre containing phenocrysts of olivine, clinopyroxene, and
typically biotite or amphibole (barkevikite), in a groundmass of glass or
analcime, often highly altered. Nepheline or leucite may be present. Its
name is derived from Serra de Monchique, Portugal. AGI
A process for extracting and purifying nickel. The main features consist
of forming nickel carbonyl by reaction of the finely divided reduced metal
with carbon monoxide, and decomposing the nickel carbonyl, with deposition
of nickel on small nickel pellets. ASM, 1
A triclinic mineral, CaHPO4 ; yellowish-white; in phosphorites.
Eng. Irregular gray limestone, Lower Lias, Lyme Regis. Arkell
A variety of smithsonite containing iron carbonate. Fay
a. A high-pressure nozzle, mounted in a swivel on a skid frame, used to
direct high-pressure water (hydraulic water) on unconsolidated gravels and
sands in alluvial mining to break down, wash, and transport them.
Syn:hydraulic monitor
b. A self-dumping car, holding from 5 to 8 tons of coal. It is filled by
emptying the mine car into it at the foot of the slope or top of the
incline. See also:gunboat
c. A gas sampler for continuous sampling of the atmosphere in a mine,
usually sounding an alarm when the gas threshold is exceeded.
Hartman, 1
d. An instrument that measures ambient conditions in an area.
Lyman
e. In hydraulicking, a high-pressure nozzle mounted in a swivel on a skid
frame. Nichols, 2
See:incline man
a. The word monkey prefixed to a technical term means small, thus: monkey
chute, a small chute; monkey drift, a small drift, usually driven in for
prospecting purposes. Fay
b. An appliance for mechanically gripping or letting go the rope in rope
haulage. Fay
c. A block placed between the rails on an incline to prevent cars from
running back. Syn:monkey chock; bobbin. Standard, 2
A single, unrailed, heavy plank, mounted above the drill platform in the
derrick or tripod and serving as a walkway or work platform. Long
Aust. See:monkey; bobbin.
A small drift driven in for prospecting purposes, or a cross-cut driven to
an airway above the gangway. Zern
A term applied to a chain bracket to be inserted between adjacent shaker
conveyor troughs to permit suspension of the trough line from the roof.
Jones, 1
a. Pennsylvania. An air course driven parallel with a gangway and heading
at a higher level. Used where a seam has considerable pitch or dip.
Fay
b. A small gangway parallel to a main gangway. Hudson
Caotchouc, or rubber, derived from a milk juice of plants and which fills
latex cells and tubes. It is resistant to decomposition and found in many
brown coals as a wooly mass. Stutzer
A narrow and low passage driven in the coal where miners take refuge while
coal is being blasted. Chiefly in mines where seams pitch sharply.
Korson
See:doghole