Of, pertaining to, or containing gold in the univalent state; e.g., aurous
chloride (AuCl).
The isothermal transformation of a ferrous alloy at a temperature below
that of pearlite formation and above that of martensite formation.
Austempering is the isothermal transformation used to form a unique
acicular matrix of bainitic ferrite and stable high-carbon austenite in
hardenable cast irons. ASM, 2
A solid solution of one or more elements in face-centered cubic iron.
Unless otherwise designated (such as nickel austenite), the solute is
generally assumed to be carbon. ASM, 1
The so-called 18-8 grades contain from 16% to 26% chromium and 6% to 20%
nickel, are not hardenable by heat treatment, and are nonmagnetic in the
annealed condition. Henderson
Forming austenite by heating a ferrous alloy into the transformation range
(partial austenitizing) or above the transformation range (complete
austenitizing). ASM, 1
An orthorhombic mineral, CaZn(AsO4 )(OH); adelite group; forms a
series with conichalcite.
Trade name for highly plastic clays from Trida, N.S.W.
New South Wales
A variety of chrome red.
A mineral or rock constituent that was formed in place; e.g., a mineral of
an igneous rock; the cement of a sedimentary rock if deposited directly
from solution; or a mineral resulting from metamorphism.
Syn:authigenic mineral
a. The process by which new minerals form in place within a rock during or
after its formation, as by replacement or recrystallization, or by
secondary enlargement of quartz overgrowths. AGI
b. Any process involving crystal growth in situ, i.e., subsequent to the
origin of its matrix or surroundings but not a product of transformation
or recrystallization, customarily reserved for low-temperature sedimentary
environments. Ant. allogenesis. Adj. authigenic; authigenous. Adv.
authigenous.
See:authigenic
Formed or generated in place; specif. said of rock constituents and
minerals that have not been transported or that crystallized locally at
the spot where they are now found, and of minerals that came into
existence at the same time as, or subsequently to, the formation of the
rock of which they constitute a part. The term, as used, often refers to a
mineral (such as quartz or feldspar) formed after deposition of the
original sediment. Syn:authigenetic
CF:autochthonous
See:authigene
In Great Britain, under the regulations made by the Minister (Smoke
Control Areas-Authorized Fuels-Regulations, 1956), authorized fuels
include coke of all kinds, anthracite, low-volatile steam coals,
Phurnacite, Coalite, Rexco, etc., as well as oil, gas, and electricity.
Nelson
An authorized person is either one appointed or permitted by the official
designated by State mining laws to be in charge of the operation of the
mine or one appointed to perform certain duties incident to generation,
transformation, and distribution or use of electricity in the mine. This
person shall be familiar with construction and operation of the apparatus
and with hazards involved.
A body of rocks that remains at its site of origin, where it is rooted to
its basement. Although not moved from their original site, autochthonous
rocks may be mildly to considerably deformed. CF:allochthon;
stationary block. Also spelled autochthone. AGI
Formed or produced in the place where now found. Applied to a rock the
dominant constituents of which have been formed in situ; e.g., rock salt.
CF:allochthonous; authigenic. Holmes, 1
Coal believed to have been formed from accumulations of plant debris at
the place where the plants grew. Two modes of origin are distinguished:
terrestrial and aquatic. Also called indigenous coal.
See also:in situ origin theory
Peat that formed in place by the gradual accumulation of plant remains in
water. It is subdivided into low-moor peat and high-moor peat.
Tomkeieff
An accumulation of plant remains in the place of their growth. The term
itself can be distinguished between autochthonous elements of growth
(euautochthony) and autochthonous elements of sedimentation
(hypautochthony). IHCP
Having a broken or brecciated structure, formed in the place where it is
found as a result of crushing, dynamic metamorphism, or other mechanical
processes; e.g., a fault breccia, or a brecciated dolomite produced by
diagenetic shrinkage followed by recementation. CF:cataclastic
AGI