An isometric mineral, 4[AgBr] ; yellow, in surface oxidation deposits of
silver ores in arid climates. Formerly called bromyrite.
CF:iodargyrite
A beryllium oxide with dihexagonal-pyramidal crystals from Langban,
Sweden. See:beryllium oxide
A member of the halogen group of elements and the only liquid nonmetallic
element. A heavy, reddish-brown liquid that volatilizes readily at room
temperature to a poisonous, red vapor with a strong disagreeable odor.
Symbol, Br. Obtained from natural brines from wells; little bromine is
extracted today from seawater. Used in antiknock gasoline, fumigants,
flameproofing agents, water purification compounds, dyes, medicinals, and
sanitizers. Handbook of Chemistry and Physics, 3
An alternate spelling of bromyrite. See also:bromargyrite
A former name for alstonite.
Recovering values from refractory or special gold ores, in which cyanogen
bromide (CNBr), or a chemical mixture forming it, is used for treating the
ore. Bennett
A colorless, heavy liquid; CHBr3 ; odor and taste similar to those
of chloroform; sp gr, 2.8887. Used in mineralogic analysis and in
assaying. CF:methylene iodide; Clerici solution; Sonstadt solution.
Syn:methenyl tribromide; tribromomethane. CCD, 2
A former name for bromargyrite.
A lead-silver sulfantimonide with 26.2% silver, some of which is
apparently diaphorite and some canfieldite. Also spelled brongniartite.
An alloy composed mainly of copper and tin. Various other elements may be
added in small amounts for certain specific purposes. A number of copper
alloys are referred to as bronzes, although they contain no tin. The
American Society for Testing and Materials has classified all copper-based
alloys on a basis of composition ranges of the principal alloying
elements. Henderson
See:phlogopite
a. A mineral consisting of a ferriferous variety of enstatite, often
having a luster like that of bronze; (Mg,Fe+2 )2 Si (sub
2) O6 ; orthorhombic. Webster 3rd; Dana, 4
b. It is often used as a prefix to the names of rocks containing the
mineral. Rocks of the gabbro family are the most common ones having the
prefix. Fay
c. A name for an orthopyroxene between enstatite and hypersthene in
composition; brown or green; commonly has a bronzelike or pearly metallic
luster.
A pyroxenite composed almost entirely of bronzite. AGI
a. Impurities as extracted with ore. Nelson
b. Corn. The heavier kinds of waste in tin and copper ores. A mixture of
tin and copper ore.
An electrically operated, rotating-cylinder viscometer in which the drag
is recorded directly on a dial; it has been used in the testing of
vitreous-enamel slips. Dodd
An orthorhombic mineral, 8[TiO2 ] ; trimorphous with anatase and
rutile; a common accessory mineral in igneous and metamorphic rocks, and
placers. See:titanium dioxide
The crushing and spreading of the head of a timber pile not fitted with a
driving band when driven into hard ground. Hammond
Derb. A sort of coarse stopping, made of small boughs of trees, and placed
in back of shaft timbers to prevent rock from falling.
a. Lanc. An underground roadway leading to a working place, driven either
to the rise or to the dip.
b. A low place in the roof of a mine, giving insufficient headroom.
c. A fault plane. Arkell
d. Top of a mine shaft. Also called pit brow. Pryor, 3
e. The projecting upper part or margin of a steep slope just below the
crest; the edge of the top of a hill or mountain, or the place at which a
gentle slope becomes abrupt. See also:apex
Mid. A massive curb or beam of timber fixed in the wall of the shaft
across the top of an inset or station. Also called browpiece.
An ore bin made by cutting away the floor of the station close to the
shaft. Higham