See:pegmatitic
See:orthoclase
A pointed bar in a slide clamp. Used to brace a machine during work.
Nichols, 2
A structure characterized by tiny peg-shaped cavities, some with intricate
profiles, penetrating the interior of crystals; typical of melilite.
AGI
A method of producing steel direct from ore. Osborne
A cylindrical-type converter having a basic (magnesite) lining; used for
treating copper. Newton, 1
A basic converting process for copper matte in a magnesite-lined
converter. The iron of the matte is fluxed by silica added before the
process begins. Liddell
See:ram scraper.
See:permissible exposure limit
Deposit found in deep water far from shore and may be predominantly either
organic or inorganic in origin. Such deposits are light colored, reddish
or brown, fine grained, and generally contain some skeletal remains of
plankton organisms. Those that contain less than about 30% of organic
remains are called red clay; those that contain more than about 30% of
organic remains are known as oozes. Hunt
A term applied to coal deposits formed from submerged forests and
driftwood. Tomkeieff
A continuous process of dissolving silver or gold in cyanide solution and
simultaneously precipitating the precious metals with mercury in the same
vessel, with an electrical current assisting precipitation.
Liddell
An English term for a very hard, smooth compact sandstone with conchoidal
fracture that occurs in coal measures.
A natural spun glass formed by blowing-out during quiet fountaining of
fluid lava, cascading lava falls, or turbulent flows, sometimes in
association with Pele's tear pyroclast. A single strand, with a diameter
of less than 1/2 mm, may be as long as 2 m. Etymol: Pele, Hawaiian goddess
of fire. AGI
Small, solidified drops of volcanic glass behind which trail pendants of
Pele's hair. They may be tear shaped, spherical, or nearly cylindrical.
Etymol: Pele, Hawaiian goddess of fire. AGI
a. A sediment or sedimentary rock composed of the finest detritus (clay-
or mud-size particles); e.g., a mudstone, or a calcareous sediment
composed of clay and minute particles of quartz. The term is equivalent to
the Latin-derived term lutite. AGI
b. A fine-grained sedimentary rock composed of more or less hydrated
aluminum silicates with which are mingled small particles of various other
minerals; an aluminous sediment. Etymol: Greek pelos, clay mud.
See also:psammite; psephite. Also spelled pelyte. AGI
a. Pertaining to or characteristic of pelite; esp. said of a sedimentary
rock composed of clay, such as a pelitic tuff representing a consolidated
volcanic ash consisting of clay-size particles. AGI
b. Said of a metamorphic rock derived from a pelite; e.g., a pelitic
hornfels or a pelitic schist, derived by metamorphism of an argillaceous
or a fine-grained aluminous sediment. AGI
A gneiss derived from the metamorphism of argillaceous sediments.
A fine-grained, nonfissile metamorphic rock derived from an argillaceous
sediment. See also:hornfels
A schistose metamorphic rock derived from an argillaceous sediment.
See also:schist
A method in which finely divided material is rolled in a drum or on an
inclined disk, so that the particles cling together and roll up into
small, spherical pellets. The addition of a binder may be required to
produce a pellet of acceptable mechanical strength. Newton, 1