A plumboan variety of crichtonite.
Arbitrary quantitative units by means of which the scratch hardness of a
mineral is determined. The nonlinear units of hardness are expressed in
numbers ranging from 1 through 10, each of which is represented by a
mineral that can be made to scratch any other mineral having a
lower-ranking number; hence the minerals are ranked from the softest, as
follows: talc (1) ranging upward in hardness through gypsum (2), calcite
(3), fluorite (4), apatite (5), orthoclase (6), quartz (7), topaz (8),
corundum (9), to the hardest, diamond. CF:hardness; Knoop hardness.
Long
A solid bar of casehardened steel, pointed at one end, with a shank and
upset collar at the other. The moil point, hammered into rock or concrete,
produces a small hole that gradually deepens and widens until the sides of
the point are in full contact with the rock. The effect is then that of
wedging, similar to plug-and-feathering. Carson, 1
A hexagonal mineral, alpha-SiC (Carborundum); in meteorites.
See also:Carborundum
A process for the reduction of chromic oxide with carbon in an electric
furnace, the hearth of which is lined with a calcium chromite prepared by
heating together lime and chromic oxide. Fay
a. Agreed percentage of water content to be allowed in mineral products
that are sold.
b. Essentially water, quantitatively determined by definite prescribed
methods which may vary according to the nature of the material.
A deduction from the inital weight of washed coal to allow for the
expected loss of water by drainage. BS, 4
The percentage moisture content equals the weight of moisture divided by
the weight of dry soil multiplied by 100. The moisture content of a coal
or mineral sample consists of two portions, namely, the free or surface
moisture which can be removed by exposure to air, and the inherent
moisture which is entrapped in the fuel, and is removed by heating at 200
degrees F (93.3 degrees C). Syn:inherent moisture; water content.
Nelson
See:compaction curve
See:compaction test
The ratio of the weight of water--which soil, after saturation, will
retain against a centrifugal force 1,000 times the force of gravity--to
the weight of the soil when dry. The ratio is stated as a percentage.
AGI
The quantity of moisture (not removable by mechanical means) contained by
a coal in equilibrium with an atmosphere saturated with water vapor. This
is employed in some systems of classification as a criterion of rank.
BS, 4
Person who determines the moisture content of ores or concentrates by
removing a sample from pile or conveyor, using a metal paddle, and
weighing the sample before and after drying. DOT
An instrument for determining the percentage of moisture in a substance
such as timber or soil, usually by measuring its electrical resistivity.
See also:atomic moisture meter
A sample taken for the determination of moisture content.
Newton, 1
See:tincalconite
a. A partly marine, partly continental sedimentary facies consisting of a
thick sequence of fossiliferous conglomerates, sandstones, shales, and
marls, characterized by primary sedimentary structures and sometimes by
coal and carbonate deposits. It is more clastic and less rhythmic than the
preceding flysch facies. AGI
b. An extensive sedimentary formation representing the totality of the
molasse facies resulting from the wearing down of elevated mountain ranges
during and immediately after the main paroxysmal (diastrophic) phase of an
orogeny, and deposited considerably in front of the preceding flysch. Adj:
molassic. CF:flysch
An explosive mixture consisting of about 80 lb (36.5 kg) of ammonium
nitrate mixed with 10 pints (4.7 L) of molasses and 5 pints (2.37 L) of
water, for quarry and opencast blasting. The molasses and water may be
used instead of fuel oil and give a denser mixture with improved
fragmentation. Nelson
A body of molding sand or other heat-resisting material containing a
cavity which when filled with molten metal yields a casting of the desired
shape. See also:die
a. A tektite from the Moldau valley, Czech Republic.
Syn:glass meteorite
b. A variety of ozocerite from Moldavia. See also:bouteillenstein
a. A board on which to ram a pattern. Standard, 2
b. A curved surface of a plow, dozer, or grader blade, or other dirt
mover, which gives dirt moving over it a rotary, spiral, or twisting
movement. Nichols, 2