Many species are found in this mode of occurrence.

Their mode of occurrence is singular or in clusters without a preferred direction.

His publications in those areas include his book, Modes of Occurrence.

Name the rocks and discuss the mode of occurrence (if possible) and origin.

Three modes of occurrence characterize this rock.

Shungite has two main modes of occurrence, disseminated within the host rock and as apparently mobilised material.

The following table is a simple subdivision of igneous rocks according to both their composition and mode of occurrence.

It was suggested that calumetite is not a post-mine evaporate because of the mode of occurrence.

A second mode of occurrence of tachylite is in the form of lava flows.

The term is intended to cover all forms in which mineralisation might occur, whether by class of deposit, mode of occurrence, genesis or composition.

His most important work was in connection with the origin and mode of occurrence of ore deposits, especially those of the western United States.

Hydrothermal deposits were broadly grouped into three types whose mineralogy and mode of occurrence indicated different conditions of origin:

In terms of modes of occurrence, igneous rocks can be either intrusive (plutonic), extrusive (volcanic) or hypabyssal.

This connection is indicated also by their mode of occurrence, for they usually accompany masses of gabbro and peridotite and seldom are found by themselves.

The mode of occurrence of the gold mineralisation tends to be small to medium-sized structurally controlled lodes, shears, and quartz veins.

Igneous rocks are classified according to mode of occurrence, texture, mineralogy, chemical composition, and the geometry of the igneous body.

Petrology: is the study of the origin and genesis of rocks; through description, analysis, classification, modes of occurrence, and theories of origin.

Modes of occurrence of the trace elements are proposed on the basis of Pearson correlation coefficients and scanning electron microscopy coupled with energy-dispersive X-ray analysis.

These two types of anorthosite have different modes of occurrence, appear to be restricted to different periods in Earth's history, and are thought to have had different origins.

Minerals of the pyrochlore group present one of the most important modes of occurrence of trace elements (Nb,Ta) and were found in various geological (geochemical) environments.

On the mode of occurrence of remains of land animals in erect trees in Nova Scotia. with Remarks on other Carnivorous Amphibians.

ERSC 3P98 Ore Geology Mode of occurrence, distribution, genesis, evaluation of and exploration for metallic and industrial mineral deposits.

Two varieties of nepheline are distinguished, differing in their external appearance and in their mode of occurrence, being analogous in these respects to sanidine and common orthoclase respectively.

On the basis of mode of occurrence two types of gold mineralization are recognized in Attappadi, (1) Primary gold mineralization is associated with quartz veins intruding to AS and PGC.