Albitization of a basalt to form a spilite. AGI
Any of the thick laths or poles driven ahead of the main timbering to
support the roof or sides in advancing a level in loose ground, or to
support the sides of a shaft when sinking through a stratum of loose
ground. Syn:spile
Ore, pulp, circulating liquor inadvertently discharged from flow line and
requiring appropriate means of recovery or removal. Syn:spillage
Pryor, 4
See:spilla
A small, short conveyor to lift coal out of a spillage pit and deliver it
into a mine car or onto the main conveyor. It is usually a chain conveyor
run either continuously or intermittently. Nelson
An opening below the loading point of a trunk or gate conveyor, to receive
spillage. If the output is small, the pit may be emptied by hand once or
twice in a shift, but if big tonnages are loaded, a spillage conveyor is
installed. Nelson
A method of tunneling through loose, running ground by driving spills
(sharp-edged thick boards or steel rods) ahead and around timber or steel
frames. Nelson
See:runoff pit
A trough to retrieve melted brass that may be spilled in pouring from a
crucible into a flask. Standard, 2
A rock representing an early stage in the formation of adinol or spotted
slate. CF:adinole
a. Shaft of a machine tool on which a cutter or grinding wheel may be
mounted. ASM, 1
b. Metal shaft to which a mounted wheel is cemented. ASM, 1
c. In founding, a rod or pipe used in forming a core. Standard, 2
A chain-on-end conveyor in which the chain pins are extended in a vertical
plane, usually of enlarged diameter in that portion above the chain, on
which special revolvable fixtures can be rotated, for the purpose of
spraying or drying. Outboard rollers or sliding shoes support the chain
and product.
a. Same as bit rotational speed. Long
b. The number of times the drive rod of a gear-feed-drill swivel head must
turn to advance the attached drill string 1 in (2.54 cm). Long
A graduated horizontal rotation axis attached to a microscope stage for
observation and measurement of optical properties of small crystals.
CF:goniometer; universal stage.
a. An isometric mineral, MgAl2 O4 ; crystallizes as
octahedra; colorless to pale tints; Mohs hardness, 7.5 to 8; in
high-temperature metamorphic rocks, contact metamorphosed limestones,
serpentinites, and ultramafic rocks; may be of gem quality.
b. The spinel series gahnite, galaxite, hercynite, and spinel.
c. The mineral group brunogeierite, chromite, cochromite, coulsonite,
cuprospinel, franklinite, gahnite, galaxite, hercynite, jacobsite,
magnesiochromite, magnesioferrite, magnetite, manganochromite, nichromite,
ringwoodite, spinel, trevorite, ulvoespinel, and vuorelainenite.
d. Minerals with the spinel structure, such as the linnaeite group.
e. A synthetic crystal with spinel structure that is used as a gemstone, a
refractory, or for instrument bearings; e.g., ferrospinel. Also spelled
spinelle; spinell; spinelite. See also:magnesium aluminate
A mixture of spinel, corundum, and magnetite, the corundum being present
in variable proportions. It is a heavy, black, fine-grained aggregate.
Dark gray crystals of corundum appear in the best varieties.
See:spinel
A medium- to coarse-grained hypidiomorphic-granular titaniferous
magnetite-rich igneous rock with spinel from a few percent to 20%.
Interpenetrating lacy elongate olivine crystals in komatiite, commonly
considered to have been formed by quenching. Their disposition resembles
the intermesh of an Australian grass for which the texture is named.
AGI
A flexible wire or plant-fiber cable or rope used as a spinning chain.
See also:spinning chain
Link chain wrapped several times around drill rod, casing, or pipe and
used on the drum to spin up or spin out such equipment when it is being
pulled or run into a borehole. A rope or flexible wire cable may be used
in lieu of a chain. Long