A yellowish-green, sometimes brownish or reddish, iron-magnesium silicate.
A common mineral in basalt and diorite. When used as a gem, it is called
peridot. The name has at various times been applied to topaz, prehnite,
and apatite, but is now used only to mean olivine. See also:olivine
Fay; Hess
Chrysoberyl cat's-eye.
A pale yellowish-green variety of beryl. Schaller
a. A translucent variety of common opal colored apple green by the
presence of nickel.
b. See:chrysoberyl
c. A gemstone trade name for opalescent chrysolite (olivine).
See also:prasopal
a. An apple-green or pale yellowish-green variety of chalcedony containing
nickel and valued as a gem. See also:green chalcedony
b. A misleading name used in the gem trade for a green-dyed chalcedony
having a much darker color than natural chrysoprase.
A monoclinic mineral (clinochrysotile), or orthorhombic mineral
(orthochrysotile, parachrysotile), [Mg6 (OH)8 Si4 O
10 ] ; serpentine group; forms soft, silky white, yellow, green, or
gray flexible fibers as veins in altered ultramafic rocks; the chief
asbestos minerals. (Not to be confused with chrysolite.)
Syn:Canadian asbestos; serpentine asbestos.
A fibrous variety of serpentine.
The part of a diamond or rotary drill that grips and holds the drill rods
or kelly and by means of which longitudinal and/or rotational movements
are transmitted to the drill rods or kelly. See also:three-jaw chuck
Long
In stamp milling, the wooden block or board that is attached to the bottom
of the screen so as to raise the depth of the issue and act as a false lip
to the mortar. Fay
A device for automatic rerailing of tubs or cars. Also called ramp;
rerailer. Mason
One of the pebbles or cobbles of sedimentary rock or of igneous rock
occurring as an inclusion in a coalbed. One explanation for their
occurrence is that they were attached to roots of floating trees rafted
into the swamp during periods of high water. AGI
Caliche deposit in Chile composed mainly of sodium sulfate.
A triclinic mineral, (Mg,Zn)5 H2 (AsO4 )4 .10H
2 O .
An isometric mineral, Ca3 (Ce,Y)Al2 (SO4 )F13
.10H2 O ; a rare-earth mineral in the Kara-Oba molybdenite deposit,
central Kazakhstan, and the Clara Mine, Oberwolfach, Germany.
Malaysia. Heavy hoe used to stir and loosen a bed when sluicing alluvial
tin gravels. Pryor, 3
Built up with large lumps of coal to increase the capacity of the car.
Also called built-up.
In bituminous coal mining, a laborer who hand loads large lumps of coal
into cars at working places in a mine. DOT
In bituminous coal mining, a laborer who arranges large lumps of coal
uniformly on flatcars as they are loaded at the mine surface. DOT
See:mendipite
A monoclinic mineral, YPO4 .2H2 O . Formerly called
weinschenkite.
A long iron rod used to hand bore shotholes in soft material, such as
coal. Pryor, 3