An obsolete syn. of allophane. AGI
Clays of the allophane, halloysite, and montmorillonite groups.
English
A constituent of a metamorphic rock which, in the new rock, has not
changed its original crystal outlines.
See:xenomorphic
See:xenomorphic
Applied by Berzelius to those substances that exist in two or more forms,
such as diamond and graphite. See also:polymorphism
See:allotropy
a. The existence of a substance, esp. an element, in two or more different
modifications usually in the same phase, such as different crystalline
forms of carbon, iron, phosphorus, and sulfur. Webster 3rd
b. Polymorphism in a chemical element; e.g., isometric and hexagonal
carbon (diamond and graphite), monoclinic and orthorhombic sulfur
(rosickyite and sulfur). An allotrope is one of the crystal forms.
Syn:allotropism
The maximum pressure that can be permitted on foundation soil giving
consideration to all pertinent factors, with adequate safety against
rupture of the soil mass or movement of the foundation of such magnitude
that the structure is impaired. Also called allowable soil pressure.
ASCE
The maximum load that can be permitted on a pile with adequate safety
against movement of such magnitude that the structure is endangered.
ASCE
If a member is so designed that the maximum stress as calculated for the
expected conditions of service is less than some certain value, the member
will have a proper margin of security against damage or failure. This
certain value is the allowable stress, of the kind, and for the material
and condition of service in question. The allowable stress is less than
the "damaging stress" because of uncertainty as to the conditions of
service, nonuniformity of material, and inaccuracy of stress analysis. The
margin between the allowable stress and the damaging stress may be reduced
in proportion to the certainty with which the conditions of service are
known, the intrinsic reliability of the material, the accuracy with which
the stress produced by the loading can be calculated, and the degree to
which failure is unattended by danger or loss. CF:factor of safety
Syn:working stress
A substance having metallic properties, and composed of two or more
chemical elements, of which at least one is a metal. ASM, 1
The act or process of alloying; specif., in minting, of alloying the
precious metals with baser ones to form a harder alloy.
Standard, 2
A laborer who salvages sludge from furnace pots for use in recovery of
metals. Also called sludger. DOT
All the alloys that can be made by mixing two metals from a binary alloy
system, three metals from a ternary alloy system, and so on. The limits of
temperature and composition within which the constituents in a system are
stable are represented by the constitutional diagram. CTD
a. A monoclinic mineral, Na,Ca)Fe+2 (Mn,Fe+2 ,Fe (super
+3) ,Mg)2 (PO4 )3 ; alluaudite group; forms a series
with ferroalluaudite; in pegmatites.
b. The mineral group alluaudite, caryinite, ferroalluaudite, hagendorfite,
maghagendorfite, and varulite.
Seldom-used plural of alluvium. AGI
a. Said of a placer formed by the action of running water, as in a stream
channel or alluvial fan; also said of the valuable mineral, e.g., gold or
diamond, associated with an alluvial placer. AGI
b. Pertaining to or composed of alluvium, or deposited by a stream or
running water; e.g., an alluvial clay or an alluvial divide. AGI
A clay that has been deposited by water on land, usually in association
with rivers or streams. ACSB, 1
An alluvial fan with steep slopes; it is generally higher and narrower
than a fan, and is composed of coarser and thicker material believed to
have been deposited by larger streams. The term is sometimes used
synonymously with alluvial fan. CF:alluvial fan
dry delta; wash. AGI
See:alluvium