A secondary mineral deposit formed in caves.
A rest period for crews at furnace, stock house, etc., or a period of work
in drilling the taphole; a change or turn. Fay
Subjecting the heated bloom to the action of rolls having regularly shaped
projections on their working surface, then subjecting the bloom while
still hot to the action of smooth-faced rolls. The surface working is said
to give a dense texture to pipe made from the bloom, adapting it to resist
corrosion. Liddell
Zinc of under 99.6% purity. Hammond
An improved maletra furnace provided with automatic rakes. Fay
A furnace of the muffle or reverberatory type, the ore being supported on
shelves and stirred mechanically. Fay
a. A monoclinic mineral, Zn4 (PO4 )2 (OH)2 .3H
2 O ; pearly white.
b. The synthetic material (Fe,Mn)3 (C,Si).
See:tritomite
a. To break ground; to continue working.
b. To exhaust by mining; to dig out; used in the phrase, to spend ground.
Standard, 2
Nuclear-reactor fuel that has been irradiated to the extent that it can no
longer effectively sustain a chain reaction. Fuel becomes spent when its
fissionable isotopes have been partially consumed and fission-product
poisons have accumulated in it. Syn:depleted fuel
A blasthole that has been fired, but has not done its work.
A calcarenite that contains ooliths and fossil debris (such as bryozoan
and foraminiferal fragments) and that has a quartz content not exceeding
10%. Type locality: Spergen Hill, situated a few miles southeast of Salem,
Indiana, where the Salem Limestone (formerly the Spergen Limestone) is
found. Syn:Bedford Limestone
An isometric mineral, PtAs2 ; pyrite group; tin white; sp gr, 10.6;
occurs with heavy-metal ores, also in placers.
A process for manufacturing white lead in which softened and desilverized
lead anodes, preferably containing some bismuth, are placed in the Sperry
cells. Direct current dissolves the lead from the anodes, and carbon
dioxide is used to precipitate white lead (basic lead carbonate) from the
solution. The Sperry process slime, which contains the impurities from the
anodes, is washed, dried, and melted to an impure bismuth bullion, which
goes to the bismuth refinery. USBM, 5
An isometric mineral, Mn3 Al2 (SiO4 )3 ;
garnet group with Mn replaced by Fe and Mg; crystallizes as dodecahedra
and trapezohedra; in skarns and granite pegmatites; may be of gem quality.
Also spelled spessartite. CF:emildine
Syn:manganese-aluminum garnet
A "lamprophyre" composed of phenocrysts of green hornblende or
clinopyroxene in a ground mass of sodic plagioclase, with accessory
olivine, biotite, apatite, and opaque oxides. Named for Spessart, Germany.
Syn:spessartine
The cauliflowerlike blowout or outcrop of a lode that extends beyond the
limits of the defined vein deeper down.
A trigonal mineral, CoCO3 ; calcite group; forms peach-blossom red
spherical masses. Also spelled spherocobaltite. Syn:cobaltocalcite
See:spherulitic
Alternate spelling of spherosiderite.
Peat composed mainly of bog moss. It is characterized by an open texture,
is lightweight, has a high absorbing power, good isolating properties, a
clean appearance, and freedom from black dust. Tomkeieff