An assemblage of intimately associated and roughly contemporaneous igneous
rocks differing in form or in petrographic type; it may consist of
plutonic rocks, volcanic rocks, or both. See also:complex
The sequence of events in which volcanic activity is followed by major
plutonic intrusions, and then minor intrusions (e.g., dikes). AGI
A high-temperature metamorphic process that includes the effects of magma
on adjacent rocks as well as those due to injection pegmatitization
(Lindgren, 1933). The term is no longer in common use.
CF:pyrometamorphism
Rock formed by the solidification of molten material that originated
within the earth.
An assemblage of temporally and spatially related igneous rocks of the
same general form of occurrence (plutonic, hypabyssal, or volcanic),
characterized by possessing in common certain chemical, mineralogic, and
textural features or properties so that the rocks together exhibit a
continuous variation from one extremity of the series to the other.
Syn:rock series
Applied to a mineral that sparks when struck with steel or iron; e.g.,
pyrite.
The rock formed by the widespread deposition and consolidation of ash
flows and neues ardentes. CF:trass; welded tuff. AGI
An assessment of the ease with which a coal can be ignited. BS, 4
The relative ignitability of a dust cloud may be defined as the degree of
ease with which it can be ignited. Sinclair, 1
a. A blasting fuse or other contrivance used to fire an explosive charge.
CTD
b. In mining, a metal cylinder that connects a main fuse with separate
fuses that are only limited by the number of blasts to be fired.
Standard, 2
c. A device to relight safety lamps internally by friction. One type uses
a waxed strip with igniting matches at intervals, while another type has a
small burred wheel operating against a piece of cerium or something of a
similar nature. Electrical devices are sometimes employed. Fay
d. One that ignites as (1) a charge, usually of black gunpowder, used to
facilitate the ignition of a propelling charge and sometimes of a bursting
charge; (2) a device for igniting fuel mixture (as in an internal
combustion engine, a jet engine, or a rocket engine); (3) a separately
energized electrode used for restriking the arc in an ignitron.
Webster 3rd
a. A cord that passes an intense flame along its length at a uniform rate
to light safety fuses in succession. BS, 12
b. Two types are manufactured: a fast cord having a nominal burning speed
of 1 s/ft (3.3 s/m) and a slow cord having a nominal burning speed of 10
s/ft (33 s/m). The burning speeds are reliable and consistent even under
adverse conditions, as, e.g., when burning underwater or in a direction
opposite to a strong wind. McAdam, 2
a. Percussion material or detonating powder. Standard, 2
b. The firing of an explosive mixture of gases, vapors, or other
substances by means of an electrical or frictional spark. CTD
c. An outburst or fire or an explosion. Mason
d. The act of igniting, or the state of being ignited; specif., in
mechanics, the act of exploding the charge of gases in the cylinder of an
internal combustion engine. Standard, 2
A flat or curved refractory roof over a furnace at the point of fuel
entrance that promotes ignition by reflection of heat. AISI
A small charge, usually of black powder, used to facilitate the ignition
of the main charge. Webster 3rd
Time interval between contact of an oxidant and a combustible and
ignition. Van Dolah
See:gas ignition
a. Of solids and liquids, the minimum temperature at which combustion can
occur, but at which it is not necessarily continuous. Pryor, 3
b. Of combustible gases, the flashpoint. Pryor, 3
a. The ignition temperature of a substance is the temperature at which
that substance starts to burn. The temperature of ignition varies greatly
with different substances. All solid fuels must be heated to their
ignition temperature before they will burn continuously by the process
known as combustion. Morris; Nelson
b. The temperature required to effect ignition of a combustible-oxidant
system at a specified pressure; in general, the minimum temperature is
implied. Van Dolah
A heavy-walled test tube of hard glass for examining the behavior of
heated substances. Webster 3rd
See:copiapite
A series of plutonic rocks containing nepheline and 30% to 60% mafic
minerals, generally clinopyroxene, and including sphene, apatite, and
melanite; also, any rock of that series. Melteigite and jacupirangite are
more mafic members of the series; urtite is a type rich in nepheline.
Named by Ramsay in 1891 for Ijola (Iivaara), Finland. AGI