See:post
A fold having an essentially vertical axial surface. Syn:vertical fold
AGI
Eng. Vertical joints. See also:thorough joints
a. A narrow passage driven on a slope, leaving a wider pillar which is to
be mined by slabbing or otherwise. Hess
b. A narrow working place driven from one pair of entries to another for
the development of a long face in semilongwall or longwall mining.
Hess
c. A tubular part such as a drill rod, the wall thickness of which has
been increased by hot forging for a short distance on one or both ends,
thereby reinforcing the area in which screw threads are cut.
See also:inside upset; outside upset. Long
d. To increase the diameter of a rock drill by blunting the end.
Fay
A means of increasing the diameter of a red-hot steel bar during forging
by striking it on the end, a state that also occurs in riveting.
Hammond
See:upcast; upcast shaft.
a. The upthrown side of a fault. AGI
b. The amount of upward vertical displacement of a fault. CF:downthrow;
heave. AGI
A washer in which separation takes place under the influence of an upward
current of water or dense medium. BS, 5
A name used for amorphous, yellow, hydrous uranium sulfates of unknown
composition. Syn:uranic ocher
A monoclinic mineral, CaB2 O2 (OH)4 ; dimorphous with
vimsite; forms radiating fibrous aggregates; at a skarn deposit in the
Turinsk area of the Urals, Russia.
a. Emerald from near Sverdlovsk in the Ural Mountains, Russia.
b. A green variety of andradite garnet (demantoid), occurring as nodules
in ultramafic rocks in the Nizhniy-Tagilsk district of the Ural Mountains;
may be of semiprecious gem quality, although rather soft. Also known as
Bobrovska garnet.
A fibrous amphibole pseudomorphous after pyroxene. A trade name for a
fireproof material, chiefly of asbestos.
The development of amphibole from pyroxene; specif. a late-magmatic or
metamorphic process of replacement whereby uralitic amphibole results from
alteration of primary pyroxene. Also, the alteration of an igneous rock in
which pyroxene is changed to amphibole; e.g., the alteration of gabbro to
greenstone by pressure metamorphism. AGI
An orthorhombic(?) mineral, (NH4 )(UO2 )(PO4 ).3H
2 O ; meta-autunite group; forms bottle-green flakes in the
oxidation zone of a uranium-coal deposit.
Combining form meaning containing uranium; e.g., uranothorite.
Syn:urano-
Ceramic products containing appreciable amounts of UO2 (or thorium)
that are used in atomic reactors. They are stable against corrosion.
A variety of opal having an apple-green fluorescence reputedly caused by
the presence of minute amounts of uranium. Crosby
See:uraconite
An isometric mineral, UO2 , commonly impure with actinide and
lanthanide rare earths, radium, helium, and zirconium; strongly
radioactive; metamict; generally black; sp gr, 10.9; in pegmatites and
veins with lead, tin, and copper minerals; a source of uranium called
pitchblende where massive and metamict. See also:pitchblende
Syn:ulrichite; coracite.
A general term for any mineral consisting of uranyl phosphate and arsenate
of the autunite, meta-autunite, and torbernite groups.
A radioactive, silvery-white, metallic element. Symbol, U. Occurs in
numerous minerals such as pitchblende, uraninite, carnotite, autunite,
uranophane, davidite, and tobernite. It is also found in phosphate rock,
lignite, and monazite sands. Uranium and its compounds are highly toxic,
both chemically and radiologically. Uranium is of great importance as a
nuclear fuel; it is used as ballast for missile reentry vehicles, as a
shielding material, and for production of high-energy X-rays.
Handbook of Chemistry and Physics, 3