स्येनाइट इसके अंग्रेजी अर्थ का उदाहरण

Nepheline syenite here is an intrusion pluton emplaced along the core of an antiform of metamorphites in Aravalli craton which has been dated 1590 million years to 1910 million years old.

The largest inbound commodities were nepheline syenite, clay, steel, fertilizer, coke and sand.

This nondescript hill in the Beemerville section of Wantage Township, is the surface expression of a lamprophyric diatreme that is the northern part of the Late Ordovician Beemerville Alkaline Complex that also includes two large nepheline syenite plutons; and several other nearby and much smaller dikes, sills, and diatremes.

Closely allied to parisite, and indeed first described as such, is a mineral from the nepheline-syenite district of Julianehaab in south Greenland.

Code search engines Borolanite is an historical petrological name for a pyroxene-melanite bearing nepheline syenite variety which contains nepheline-alkali feldspar pseudomorphs interpreted to be after leucite which occur as conspicuous white spots in the dark rock matrix.

In this locality there is a considerable area of granite rich in red alkali feldspar, and passing, by diminution in the amount of its quartz, into quartz-syenites and syenites.

At the margins of the outcrop patches of nepheline syenite occur; usually the nepheline is decomposed, but occasionally it is well preserved; the other ingredients of the rock are brown garnet (melanite) and aegirine.

The abundance of melanite is very unusual in igneous rocks, though some syenites, leucitophyres, and aegirine-felsites resemble borolanite in this respect.

In places the nepheline syenite assumes the form of a dark rock with large rounded white spots.

From the analogy of certain leucite syenites which are known in Arkansas, it is very probable that these spots represent original leucites which have been changed into aggregates of the above-named minerals.

Connected with the borolanite there are other types of nepheline syenite and pegmatite.

In Finland, melanite bearing nepheline rocks have been found and described as ijolite, but the only other locality for melanite-leucite-syenite is Magnet Cove igneous complex in Arkansas.

Granites, syenites, and diorites, covered with Laurentian metamorphic slates, occurred extensively in the north-west.