A rich silver mine. Mathews
See:stromeyerite
A wagoner who hauls silver ore. Mathews
The native silver sulfide, argentite. Fay
Silver bromide, AgBr; silver iodide, AgI; silver chloride, AgCl; and
silver fluoride, AgF. The bromide and chloride are sensitive to light and
are of basic importance in photography. CMD
a. A plating or covering of silver or an imitation of it, as applied to
any surface; as, the silvering on the back of a mirror.
Standard, 2
b. The art or process of coating surfaces with silver. Standard, 2
Lead containing silver. Standard, 2
The name given to galena containing silver. When 1% or more of silver is
present, it becomes a valuable ore of silver. Syn:argentiferous galena
CMD
Occurs native, alloyed with gold as electrum, as sulfide argentite, Ag
2 S , proustite, pyrargyrite, and horn silver, AgCl, or cerargyrite.
Main source is argentiferous ores of lead, zinc, and copper where it is
extracted as a byproduct. Bulk of production is used for coinage,
electrical alloys, photographic chemicals, and the arts. Pryor, 3
a. A sharp, fine sand of a silvery appearance used for grinding
lithographic stones, etc.
b. Specially pure silica. Pryor, 3
a. The basic outer shell of the Earth; under the continents it underlies
the sial, but under the oceans it directly underlies the water.
Originally, the sima was considered basaltic in composition with a
specific gravity of about 3.0. In recent years, it has been suggested that
the sima is peridotitic in composition with a specific gravity of about
3.3. First used in its present form and spelling by Suess. AGI
b. A petrologic name for the lower layer of the Earth's crust, composed of
rocks that are rich in silica and magnesia. It is equivalent to the
oceanic crust and to the lower portion of the continental crust,
underlying the sial. Etymol: an acronym for silica + magnesia. Adj:
simatic. CF:sial; sialma. Syn:intermediate layer; basaltic layer.
AGI
An improved liquid oxygen breathing apparatus, weighing 33 lb (15 kg) and
approved for use in British mines. Air is fed to the wearer at a
temperature of 50 degrees F (10 degrees C) rising to 70 degrees F (21.1
degrees C) in just over 1/2 h and is still only 80 degrees F (26.7 degrees
C) after 2-1/2 h. Nelson
A deep-red to light orange-yellow variety of amber having a high content
of sulfur and oxygen and a low content of succinic acid; occurs in the
waters off Sicily.
A fold in which the orthogonal thickness of the folded strata is greater
in the hinge than in the limbs, but the distance between any two folded
surfaces is constant when measured parallel to the axial surface. Thus, if
the shape of one bed is that of a sine curve, all the beds show the same
shape. Similar folds show thinning on the limbs and thickening at the
axes. CF:parallel fold; supratenuous fold. Syn:concentric fold
AGI
A golden-colored variety of brass. Also called Mannheim gold; Prince
Rupert's metal.
See:bloedite
A simply supported beam. Hammond
The bending of a beam that is freely supported, having no fixed end.
Hammond
These explosives consist of one simple chemical compound. The explosive
heat is liberated with the breaking down of the molecules and the atoms
recombining to form water, carbon dioxide, nitrogen and other gases, and
possibly solid substances such as carbon. To this group belong explosives
in the proper sense of the word, such as nitroglycerin, nitroglycol,
nitrocellulose, trotyl, and cyclonite (RDX). Also includes "molecular
explosives." Fraenkel
A variety of kriging that assumes that local means are relatively constant
and equal to the population mean, which is well known. The population mean
is used as a factor in each local estimate along with the samples in the
local neighborhood. This is not usually the most appropriate method for
environmental situations.
A mineral found in nature, as distinguished from rocks, which, in the
scientific sense, are mixtures of minerals. Calcite and hematite are
simple minerals, while granite is a mixture of three simple
minerals--quartz, feldspar, and mica. Standard, 2; Fay