a. Eng. A tool for cleaning blast holes. Also called clanger. Fay
b. Derb. A piece of stone that has a joint in back of it, which becomes
loose and falls when a tunnel has been driven past it. Fay
An isometric mineral, PbSe ; forms a crystal-solution series with galena,
which it resembles. Syn:lead selenide
An extremely fine-grained natural earthy material composed primarily of
hydrous aluminum silicates. It may be a mixture of clay minerals and small
amounts of nonclay materials or it may be predominantly one clay mineral.
The type is determined by the predominant clay mineral. Clay is plastic
when sufficiently pulverized and wetted, rigid when dry, and vitreous when
fired to a sufficiently high temperature. See also:clay mineral;
fireclay; bentonite. ASTM
A back slip in a coal seam containing a clayey deposit.
See also:back slip
A light-colored, argillaceous layer in clay ironstone. Also spelled
clayband. AGI
A mud auger; a mud bit; also, a bit designed for use on a clay barrel.
See also:clay-boring bit
Structural clay tile with tongue and groove edges resembling a book in
shape. Hess
A special coring bit used to split inner-tube core barrels. The thickness
of the bit face is reduced and the inside shoulder is not inset with
diamonds to allow a sharp-edged inner barrel to extend through and project
a short distance beyond the face of the bit. Also called clay bit; mud
bit. Long
A clay seam or clay gouge found along the sides of some veins.
Weathered argillaceous material forming a layer immediately overlying
bedrock. AGI
Cutting ring at the entry to a pipe feeding into a suction cutter dredge.
Set of cutting blades in dredge trommel used to break clay brought up by
dredge buckets. Pryor, 3
One who seals kiln doors before burning and kiln fireboxes after burning
and assists other workers in knocking out doors and in unsealing fireboxes
after cooling. Also called dauber; plaster man. DOT
See:argillaceous
A soil in which clay is the basic constituent. The clay contributes to
strength by cohesion, but detracts from stability by volume change and by
plastic flow under load. Nelson
a. Mud curl or cylinder formed by drying and cracking of thin layers of
coherent mud; commonly rolled or blown into sand and buried; flattened
upon wetting forming a lenticular bleb of clay or shale.
Pettijohn, 1
b. Eng. Clay gall pellet of clay or mudstone, often ocherous, sometimes
hollow, found esp. in false-bedded oolitic limestones such as forest
marble. Arkell
a. A clayey deposit in a fault zone. See also:fault gouge
b. A thin seam of clay separating masses of ore, or separating ore from
country rock. See also:gouge
Equipment used to fire a ball of fire clay into the tap hole of a blast
furnace. See also:mud gun
See:clay pocket
Lining a borehole with clay, to keep explosives dry. Fay
A rod or tool for lining a newly made coal shot hole with clay to seal up
any breaks in the walls of the hole. The hole is filled with clay to about
one-third of its length. The claying bar is driven in by hammer to the
limit and rotated by a tommy bar in the eyelet at the outer end of the
bar. See also:clay iron; bull; scraper and break detector.
Nelson