Iolite, a variety of cordierite.
a. Any orange, orange-brown, or orange-red variety of quartz resembling
the color of topaz; e.g., heat-treated amethyst. CF:topaz;
Madeira topaz.
b. A wine-colored or brownish red citrine from Spain.
See:gypsum
a. A term loosely applied to any transparent or translucent light-colored
mineral that is readily cleavable having a vitreous luster; e.g., Iceland
spar (calcite), fluorspar (flourite), feldspar, heavy spar (barite).
b. Applied locally by miners to small clay veins found in coal seams.
AGI
c. Corn. Quartz.
d. See:Iceland spar
A nonmetallic tin ore occurring in small granules. Osborne
A collective term for the late Percambrian fragmental rocks of
Scandinavia, esp. the feldspathic sandstones of the Swedish Jotnian,
consisting mainly of coarse arkoses and subarkoses, together with
polygenetic conglomerates and graywackes. Etymol: Greek sparagma,
fragment, thing torn, piece. AGI
N. of Eng. A wedge from 6 to 8 in (15 to 20 cm) long for driving behind
plates when adjusting them to the circle of the shaft. Also called spear
wedge.
See:standby face
a. A descriptive term for the crystalline transparent or translucent
interstitial component of limestone, consisting of clean, relatively
coarse-grained calcite or aragonite that either accumulated during
deposition or was introduced later as a cement. It is more coarsely
crystalline than micrite, the grains having diameters that exceed 10 mu m.
AGI
b. A limestone in which the sparite cement is more abundant than the
micrite matrix. AGI
See:absorber
An instrument for detecting and measuring nuclear radiation; analogous to
the cloud chamber. It consists of numerous electrically charged metal
plates mounted in a parallel array, the spaces between the plates being
occupied by inert gas. Ionizing radiation causes sparks to jump between
the plates along its path through the chamber. See also:bubble chamber;
cloud chamber. Lyman
A marine seismic source that employs an electrical spark discharge to form
the outgoing signal and produces a trace in the recorder showing the
subbottom strata. Hy
A matte containing about 74% copper. Webster 3rd
Identification of type of iron alloy by appearance of sparks emitted when
rubbed on grindstone. Pryor, 3
a. Pertaining to, resembling, or consisting of "spar"; e.g., sparry vein
or sparry luster. Like spathic; as in feldspathic. See also:spar
b. Pertaining to "sparite" esp. in allusion to the relative clarity, both
in thin section and hand specimen, of the calcite cement; abounding with
sparite, such as a sparry rock.
See:siderite
A lode filled with spar, e.g., fluorspar, calcspar, or heavy spar.
A field term to denote, in accordance with an arbitrary scale established
for use in describing banded coal, a frequency of occurrence of vitrain
bands comprising less than 15% of the total coal layer.
CF:abundant vitrain; dominant vitrain; moderate vitrain. AGI
A variety of calcite containing some manganese. Fay
A former name for zincite.
a. Corn. In mining, to fine for disobedience of orders.
b. A variation of spall.