Combining form meaning stone or rock.
Any of several materials and compounds present in, or derived from,
natural gas or crude petroleum by physical refining or by chemical
reaction. Bennett
a. The study of the chemical composition of rocks. AGI
b. The study of the chemistry of petroleum and its products. AGI
The study of spatial relations, esp. on a microscale, of the
structural-textural units that comprise a rock, including a study of the
movements that produced these elements. The units may be rock fragments,
mineral grains, or cleavages.
A branch of petrology that deals with the origin of rocks.
Syn:lithogenesis; petrogeny. CF:genesis
An element that is characteristically concentrated in ordinary rock types
as opposed to ore deposits. CF:metallogenic element
See:petrogenesis
Person who is versed in or engaged in petrography, or the study of rocks.
Fay
Pertaining to the study of rocks. Stokes
A microscope specially fitted with optical, esp. polarizers, and
mechanical accessories for identifying and studying the properties of
minerals in granular form or in thin section.
A natural region within which some or all of the igneous rocks present
certain well-marked peculiarities in their mineralogical and chemical
composition, structure, texture, etc., that set them apart from rocks of
other petrographic provinces. Consanguineous, comagmatic.
Syn:comagmatic region
A general term for the science dealing with the description and
systematical classification of rocks, based on observations in the field,
on hand specimens, and on thin sections. Petrography is thus wider in its
scope than lithology, but more restricted than petrology, which implies
interpretation as well as description. Holmes, 2
Cokelike material found in cavities of igneous rocks intrusive into
carbonaceous sediments. Tomkeieff
A mixture of hydrocarbons boiling from 40 to 60 degrees C; a mixture of
low-boiling liquid alkanes. Handbook of Chemistry and Physics, 1
See:oil shale
A general term for the study, by all available methods, of the natural
history of rocks, including their origins, present conditions,
alterations, and decay. Petrology comprises petrography on the one hand,
and petrogenesis on the other, and properly considered, its subject matter
includes ore deposits and mineral deposits in general, as well as rocks in
the more limited sense in which that term is generally understood.
Holmes, 2
See:oil shale
Study of the physical properties of rock. AGI
Said of a material that resembles stone in its hardness; e.g., petrous
phosphates. Little used. AGI
See:china stone