An orthorhombic mineral, (Na,K)10 Ca5 Al6 Si32
O80 (Cl2 ,F2 ,SO4 )3 .18H (sub 2) O ;
forms in laths in a melilite nephelinite lava at Mt. Shaheru, Kivu
Province, Congo.
Capable of becoming liquid by the absorption of moisture from the air;
e.g., calcium chloride crystals. Standard, 2
See:rising main
The date on which a metal has to be delivered to fulfill the contract
terms. Also called prompt date. Wolff
A drift or adit connected to a shaft from a point on the surface at a
lower level than the shaft top and used as an outlet into which mine pumps
discharge, so reducing the height through which the water must be lifted.
Syn:jackhead
Eng. A road into which a face conveyor delivers the coal. SMRB
a. A conveyor that transports material from the discharge of a machine.
b. A table onto which a chute discharges.
a. An extrusive rock between rhyolite and dacite in composition, and,
broadly, the extrusive equivalent of granodiorite.
Webster 2nd; Fay
b. See:plagioclase rhyolite
c. A rhyodacite from Dellen Lake, Sweden.
See:dalles
See:tanteuxenite
York. The working places in ironstone quarries. Nelson
See:overhand stoping
A monoclinic mineral, CaSrV2 O6 (OH)2 .3H2 O ;
pale yellow-green microcrystalline efflorescence on sandstone occurring in
Montrose County, CO.
The polymorphic form of iron stable between 1,403 degrees F (762 degrees
C) and the melting point (about 1,532 degrees F or 833 degrees C). The
space lattice is the same as that of alpha iron and different from that of
gamma iron. CTD
A mixture of crandallite and hydroxylapatite
A method of fire control in which water is sprayed or sprinkled in
sufficient volume to overwhelm the fire and put it out.
Federal Mine Safety
A rope cappel used in Koepe winding, particularly in Germany. The rope is
led along the side of the eye and secured by a hinged retaining arm lined
with rubber, and then turned around the eye and held in position by
pressure exerted by knee-action links. Nelson
Demag drag-belt shuttle conveyor
Consists of a single length of belting, half the length of a double unit
face, which is shuttled backward and forward along the face by means of
low-type winches at each end of the face, interlocked and fitted with
limit switches. The coal is plowed off the belt at the loader gate onto
the gate conveyor. Sinclair, 5
To disperse, by means of a suitable magnetic field, solids in a dense
medium that have flocculated magnetically.
An atmosphere-supplying respirator that admits respirable gas to the
facepiece only when a negative pressure is created inside the facepiece by
inhalation. ANSI
A transparent, green variety of andradite, having a brilliant luster and
used as a gem. Also called Uralian emerald. Dana, 4