A genetic term applied to igneous rocks with an orbicular texture in which
the nuclei of the orbicules are formed of inclusions of the same
generation as the groundmass. CF:isothrausmatic; heterothrausmatic;
crystallothrausmatic. AGI
A general term for a series of rock strata having the same dip, e.g., one
limb of a fold, a tilted fault block, or an isocline. CF:monocline
Adj: homoclinal. AGI
A near similarity of crystalline forms between unlike chemical compounds.
Fay
In geochemical prospecting, the homogeneity of a geochemical anomaly is a
measure of the smoothness, or absence of strong local variations, in the
distribution of the indicator element. Hawkes, 1
Made up of similar parts or elements; of the same composition or structure
throughout; uniform. Opposite of heterogeneous. Standard, 2
A mass that exhibits essentially the same physical properties at every
point throughout the mass. ASCE
A crystal characterized by covalent bonding--the type of atomic bonding
resulting from the sharing of electrons by neighboring atoms.
ASM, 1
Line on the Earth's surface connecting points where the seismic wave
arrives, generated by an earthquake, at the same time.
Schieferdecker
Ventilation by a current of air traveling in the same direction as the
flow of mineral out of a mine. See also:descensional ventilation;
ascensional ventilation; antitropal ventilation. BS, 8
Formerly called selen-tellurium (Se,Te) , a variety of the trigonal
mineral form of tellurium, Te .
Any substance, as cast iron, worm-eaten wood, etc., having cells
suggesting a honeycomb; also applied to certain rock structures.
Webster 2nd; Fay
An arrangement of soil particles having a comparatively loose, stable
structure resembling a honeycomb. See also:soil structure;
flocculent structure; single-grained structure. ASCE
A type of chemical weathering in which innumerable pits are produced on a
rock exposure. The pitted surface resembles an enlarged honeycomb and is
characteristic of finely granular rocks, such as tuffs and sandstones, in
an arid region. AGI
A mellate of aluminum, Al2 [C6 (COO)6 ].16H2) O , of
yellowish or reddish color, and a resinous aspect, crystallizing in
octahedrons with a square base. See also:mellite
Fay; Tomkeieff
A continental method of shaft sinking through sand that is water bearing.
The shaft is formed by boring in stages, increasing in size from the pilot
hole of about 4 ft (1.2 m) in diameter to the final excavation size. Once
the shaft is bored, mud flush circulation continues while the lining is
lowered. The lining consists of two steel cylinders, one within the other,
and the annular space is filled with concrete. The cylinders are lowered
into the shaft, and 10-ft (3-m) lengths are added and welded in position
at the shaft top. Nelson
A fantastic column, pinnacle, or pillar of rock produced in a region of
sporadic heavy rainfall by differential weathering or erosion of
horizontal strata, facilitated by joints and by layers of varying
hardness, and occurring in varied and often eccentric or grotesque forms.
Syn:rock pillar
The lower sheave or block, on a crane hoist, to which a swivel hook is
attached. Fay
A statement of elastic deformation, that the strain is linearly
proportional to the applied stress. See also:elasticity
A method of lashing on to the rope in which the chain, after lapping two
to five times around the rope, depending on the load and the inclination,
is brought forward across the laps and threaded through the hook at the
front. This method keeps the last lap tight and prevents the laps from
spreading. Sinclair, 5
The worker who adjusts cables or chains about objects to be lifted; places
hook of crane block in bucket bails, and hooks winches to objects to be
moved, etc. Fay
In bituminous coal mining, a laborer who attaches the hook at the end of a
hoisting cable to the link of the leading or near car of a trip of cars to
be hauled up or lowered down an incline in the mine or at the surface.
Also called rope cutter. DOT