A map showing the distribution of different types of rock attributes or
facies occurring within a designated geologic unit.
a. Aust. The main vertical joints often seen in coal seams; they may be
confined to the coal, or continue into the adjoining rocks.
See also:cleat
b. A face slip or joint as opposed to a back slip. The plane is inclined
towards the observer from floor to roof. Nelson
c. A powdered substance (such as graphite) applied to the face of a mold
or mixed with sand that forms it, to give a smooth surface to the casting.
Webster 3rd
d. Applied to the original direction of a layer. AGI
e. In machining, generating a surface on a rotating workpiece by the
traverse of a tool perpendicular to the axis of rotation. ASM, 1
f. In founding, special sand placed against a pattern to improve the
surface quality of the casting. ASM, 1
g. Any material, forming a part of a wall, used as a finishing surface.
ACSG, 1
The direction of the top of beds is esp. important in steeply dipping or
overturned beds. The tops of the beds or their facing is determined by
ripple marks, graded bedding, crossbedding, mud cracks, pillow structure,
etc. AGI
A type of cut gem bounded by planar faces as distinguished from cabochon
cut or other unfaceted cut. Also called faceted cut.
The ratio of the ultimate breaking strength of the material to the force
exerted against it. If a rope will break under a load of 6,000 lb (2,724
kg), and it is carrying a load of 2,000 lb (908 kg), its factor of safety
is 6,000/2,000 = 3, or f.s 3. See also:allowable stress
Brantly, 2
This cut is drilled with handheld equipment. The empty hole is drilled in
two steps, the first as an ordinary hole and the second as an enlargement
of this pilot hole. The cut is something between a four-section cut and a
double-spiral cut. The Fagersta cut is drilled with light equipment, which
makes it suitable for use in mines and in small drifts, where drilling
with heavy machines is not profitable. Langefors
A hexagonal mineral, (Mn,Mg)Fe2 Be2 (PO4 )4
.6H2 O ; forms tufts, rosettes, or botryoidal masses of fibers
coating primary minerals, such as muscovite and quartz; in pegmatites,
Minas Gerais, Brazil.
A term originally used by German miners to indicate a band of sulfide
impregnation in metamorphic rocks. The sulfides are too abundant to be
classed as accessory minerals, but too sparse to form an ore lens.
Fahlbands have a characteristic rusty-brown appearance on weathering.
AGI
Ger. A gray copper ore. Sometimes called fahl ore. Syn:tetrahedrite;
tennantite. Fay; AGI
Altered cordierite.
Commonly used thermometer scale in which the freezing point of water is 32
degrees and the boiling point is 212 degrees . To convert from the
Fahrenheit scale to the centigrade or Celsius scale, subtract 32 and
multiply by 5/9. Symbol, F. See also:temperature
These include (1) a hydraulic classifier and (2) a flotation cell marketed
as the Denver Sub A. Pryor, 3
A drill hole loaded with dynamite that did not explode. Fay
See:shear failure
A hexagonal mineral, K2 Ca(CO3 )2 ; dimorphous with
bueschliite; in fused wood ash in partly burned trees.
a. A triclinic mineral, Ca2 (Mn,Fe)(PO4 )2 .2H (sub
2) O ; transparent pearly to subadamantine; in granite pegmatites in
Fairfield County, CT, as an alteration of dickinsonite and a pseudomorph
after rhodochrosite.
b. The mineral group cassidyite, collinsite, fairfieldite, messelite, and
roselite-beta. Syn:leucomanganite
a. A device that lines up cable so that it will wind smoothly onto a drum.
Nichols, 2
b. Applies to the swivel pully on the drag rope of a dragline excavator.
Hammond
c. A block, ring, or strip of plank with holes that serves as a guide for
the running rigging or for any ship's rope and keeps it from chafing.
Webster 3rd
a. A cruciform-twinned crystal of staurolite, used as a curio stone
without fashioning for adornment. The term is also applied as a syn. of
staurolite, and esp. to the variety occurring in the form of a twinned
crystal. See also:staurolite
b. Any of various odd or fantastically shaped calcareous or ferruginous
concretions formed in alluvial clays. AGI
c. A fossil sea urchin. AGI
d. A stone arrowhead. AGI
Accidental lineup of disturbances on a seismogram simulating a reflection.
Schieferdecker
Recovery of nickel from a nickel-copper matte. After crushing and roasting
to remove sulfur, the copper is acid-leached, filtered off, and
electrolyzed. The residual solids are melted, cast as anodes, and refined
to produce nickel. Pryor, 3
A mechanically raked muffle furnace having three hearths with combustion
flues under the lowest hearth. Fay