A type of mixed rock or chorismite in which the units of the fabric
(granitic material and metamorphic or sedimentary rock) form a system of
layers, strata, or bands so intricately united that the whole rather than
the individual layers constitutes the geological field unit.
A structure produced by sediment trapping and/or precipitation as a result
of the growth of cyanophytes (blue-green algae). It has a variety of gross
forms, from nearly horizontal to markedly columnar, domal, or
subspherical. Syn:algal stromatolite; stromatolith. AGI
a. See:stromatolite
b. A complex, sill-like igneous intrusion that is interfingered with
sedimentary strata. AGI
An orthorhombic mineral, AgCuS ; metallic; soft; steel gray with blue
tarnish; sp gr, 6.2 to 6.3; in copper-silver veins; a source of copper and
silver. Syn:silver-copper glance
a. Hard and thick; said of dikes. Standard, 2
b. Important or rich; said of veins. Standard, 2
c. Referring to the character of bind, meaning that the argillaceous
material is largely mixed with the arenaceous or siliceous material.
d. Scot. Hard, not easily broken, e.g., strong coal, strong blaes.
e. Said of large or important mineral veins or faults. AGI
A heavy timber or metal beam or bar for taking a strain.
Webster 3rd
A large, persistent lode. At Alston moor, England, applied to lodes lying
in a fault plane in which the difference of level between similar strata
is considerable.
An orthorhombic mineral, 4[SrCO3 ] ; aragonite group; in
hydrothermal veins associated with limestones, less commonly with eruptive
rocks in California, New York, Washington, Germany, and Mexico; a source
of strontium. Syn:carbonate of strontium
A monoclinic mineral, (Sr,Ca)2 B14 O23 .8H2 O;
forms a series with ginorite. CF:ginorite
A silvery-white, alkaline-earth metal. Symbol, Sr. It does not occur
naturally; found chiefly as celestite (SrSO4 ) and strontianite
(SrCO3 ). Major use at present is for color television picture
tubes. Handbook of Chemistry and Physics, 3
A hexagonal mineral, Sr5 (PO4 )3 (OH) ; apatite
group; vitreous; light green; in sugary albite filling interstices between
crystals of aegirine and eckermannite in veins in alkalic pegmatites from
Inagil massif, southern Yakutia, Russia.
Used primarily in television face-plate glass, in ceramic ferrites, and in
pyrotechnics. The United States imports most of its celestite, the chief
source of strontium, from Mexico and Germany.
SrSnO3 ; sometimes used as an additive to titanate bodies, one
result being a decrease in the Curie temperature. Dodd
SrTiO3 ; isometric; and melting point, 1,670 degrees C. Used in
ceramic dielectric bodies, either alone or in combination with barium
titanate or other titanates. Lee; Handbook of Chemistry and Physics, 2
SrZrO3 ; melting point, 2,700 degrees C; sp gr, 5.48. Sometimes
used in small amounts (3% to 5%) in ceramic dielectric bodies, one effect
being to lower the Curie temperature. Dodd
a. The capacity of a mine car, tram, hoppit, or wagon to the flat surface
at the edges; i.e., the volume of water it would hold if of watertight
construction. Nelson
b. In scraper loading, the maximum volume of liquid that the bowl can
hold. CF:heaped capacity
Corn. The termination of a vein or lode by a fault.
Of or pertaining to rock deformation or to features that result from it.
AGI
The initial stage of structural design, in which all the forces carried by
the various parts of a structure are determined. Hammond
A low area in the Earth's crust, of tectonic origin, in which sediments
have accumulated, e.g., a circular centrocline such as the Michigan Basin,
a fault-bordered intermontane feature such as the Bighorn Basin of
Wyoming, or a linear crustal downwarp such as the Appalachian Basin. Such
features were drainage basins at the time of sedimentation, but are not
necessarily so today. AGI
See:bottoming