a. A metamorphic rock, intermediate in grade between slate and mica
schist. Minute crystals of sericite and chlorite impart a silky sheen to
the surfaces of cleavage (or schistosity). Phyllites commonly exhibit
corrugated cleavage surfaces. CF:illite; phyllonite. AGI
b. A general term for minerals with a layered crystal structure.
AGI
c. A general term used by some French authors for the scaly minerals, such
as micas, chlorites, clays, and vermiculites.
See:phyllonite
Rock cleavage in which flakes are produced that are barely visible to the
unaided eye. It is coarser than slaty cleavage and finer than schistose
cleavage. Leet, 1
A rock that macroscopically resembles phyllite but that is formed by
mechanical degradation (mylonization) of initially coarser rocks (e.g.,
graywacke, granite, or gneiss). Silky films of recrystallized mica or
chlorite, smeared out along schistosity surfaces, and formation by
dislocation metamorphism are characteristic. Syn:phyllite-mylonite
See also:mylonite gneiss
The processes of mylonitization and recrystallization to produce a
phyllonite. AGI
Crystalline hydrocarbon similar to fichtelite and extracted along with
fichtelite from fossil pine wood. Tomkeieff
Vitrain in which the plant remains are discernible under a microscope.
Tomkeieff
A suffix used in naming rocks that are porphyritic, such as vitrophyre,
orthophyre, or granophyre.
The exhaustion of a mine or a petroleum reservoir by extracting the
minerals. Williams
A broad division of geology that concerns itself with the processes and
forces involved in the inorganic evolution of the Earth and its
morphology, and with its constituent minerals, rocks, magmas, and core
materials. CF:historical geology
That branch of mineralogy which treats of the physical properties of
minerals. CF:chemical mineralogy
That marine science which treats of the Earth's water mass as a fluid and
studies its physical properties of motion, density, temperature, etc.
Hy
A state of collapse that interferes with the normal heart action,
respiration, and circulation. This condition is probably due to
derangement or lack of proper balance within the sympathetic nervous
system and may be caused by any number of things, such as serious injury,
loss of blood, severe burns, fright, and many others. It is important to
look for shock when rendering first aid since it may cause death even when
the injury is less serious. Kentucky
The science, or group of sciences, that treats of the phenomena associated
with matter in general, esp. in its relations to energy, and of the laws
governing these phenomena, excluding the special laws peculiar to living
matter (biology) or to special kinds of matter (chemistry). Physics treats
of the constitution and properties of matter, mechanics, acoustics, heat,
optics, electricity, and magnetism. More generally, it includes all the
physical sciences. Standard, 2
A region of which all parts are similar in geologic structure and which
has consequently had a unified geomorphic history; a region whose pattern
of relief features or landforms differs significantly from that of
adjacent regions. AGI
The term was introduced by G. H. Cady in 1942, to designate plant forms or
fossils in coal as distinguished from the material of which the fossils
may be composed. Phyterals are identified in general botanical terms that
are usually morphological, such as spore coat, sporangium, cuticle, resin,
wax, wood substance, bark, etc. The initial composition of the phyterals
differed; these or other differences produced during diagenesis may or may
not be perpetuated by and during carbonification (coalification).
Phyterals are recognized with increasing difficulty in high rank coals. In
contrast to macerals which represent a purely petrographical concept, the
concept phyteral demands strict correlation with certain organs of the
initial plant material. IHCP
Rock formed from plant remains. Tomkeieff
A rock formed by plant activity or composed chiefly of plant remains. The
term was applied by Grabau to a large group including coal, peat,
lignites, some types of reef limestones, and oolites. AGI
The plant life division of plankton, including diatoms and algae.
Unattached plants that are at the mercy of the currents. Hy
A screen formed by piano wires stretched tightly, lengthwise, on a frame 2
to 3 ft (0.61 to 0.91 m) wide and 4 to 8 ft (1.2 to 2.4 m) high. The
screen is set up at an angle of about 45 degrees and crushed material is
fed to it from above. The mesh size varies from about 4 to 16. Because
there are no cross wires, and because the taut wires can vibrate, there is
less tendency for blinding, but some elongated particles inevitably pass
the screen. Dodd
A peak or sharply pointed hill or mountain; commonly a volcanic rock. The
term is used in desert regions of the Southwestern United States.