A hydrous calcium carbonate, CaCO3 .3H2 O . A moldlike
incrustation on chalk marl. From Nova-Alexandria, Poland. English
A hexagonal mineral, (K,Na)AlSiO4 ; polymorphous with kaliophilite,
kalsilite, and panunzite.
A method of surveying in which the lengths of the three sides of a series
of touching or overlapping triangles are measured (usually by electronic
methods) and the angles are computed from the measured lengths.
CF:triangulation
See:trilling
A cyclic crystal twin consisting of three individuals. CF:fourling;
fiveling; eightling. Syn:treeling; trill. See also:threeling
A primitive, extinct crustacean, occurring throughout the Paleozoic and
abundant in the earlier Paleozoic periods, characterized by a segmented
body divided by longitudinal grooves into three lobes.
A monoclinic mineral, CaMn2 Be3 (SiO4 )3 .
A solid figure in which the three axes are all unequal, but intersect one
another at right angles. Syn:orthorhombic
Unloaded drill holes closely spaced along a line to limit the breakage of
a blast. Syn:relief holes
a. A shothole bored slightly outward to trim the drivage to the shape
required. Mason
b. An apparatus for trimming a pile of coal into a regular form (such as a
cone or prism). Webster 3rd
c. One who uses a shovel to distribute loose material--such as coal,
rubbish, sand, or other substances--in railroad cars or holds of ships and
barges during or after loading. May be designated according to material
trimmed, such as a coal trimmer. DOT
A self-contained, light-weight portable conveyor, usually of the belt
type, for use in unloading and delivering bulk materials from trucks to
domestic storage, and for trimming bulk materials in bins or piles.
See also:portable conveyor
These complete the breaking out of the ground. The positioning and number
of trimmer shots are governed by the size of the drift, the hardness of
the ground, and the fragmentation required for the loading-out method to
be adopted. McAdam, 2
a. The shotholes drilled around the periphery of a shaft or tunnel that
break or trim the sides of the excavation to the shape and size required.
See also:cut holes
b. The top row of holes in a tunnel face. Stauffer
See:mica house
The property of a chemical compound to crystallize in one of three
different crystal structures. CF:dimorphism; polymorphism.
A chemical compound that may crystallize in one of three different crystal
structures.
Dense asphaltic petroleum containing 9% sulfur. Tomkeieff
See:nitroglycerin
See:nitroglycerin
trinitrotoluene-ammonium nitrate explosive
An explosive containing ammonium nitrate sensitized with trinitrotoluene.
A proportion of aluminum powder or calcium silicide may be added to
increase power and sensitiveness. Nelson
A resinous substance occurring in large amorphous masses of a hyacinth-red
to chestnut-brown color in brown coal near Albona, Istria (former
Yugoslavia). Resembles tasmanite in composition. AGI