norite

Gabbro or norite is also quarried from parts of the Complex and rendered into dimension stone.

Often, cumulate layers are polyminerallic, forming gabbro, norite and other rock types.

Rapakivi granites are often found associated with intrusions of anorthosite, norite, charnockite and mangerite.

Magnesian orthopyroxene occurs in plutonic rocks such as gabbro (norite) and diorite.

If the amount of orthopyroxene is substantially greater than the amount of clinopyroxene, the rock is then a norite.

Ultramafic rock types: Peridotite, dunite, norite, essexite, komatiite.

It often occurs in association with norite, anorthosite, charnockite and rapakivi granite in Proterozoic metamorphic belts.

Most of the dykes are quartz-dolerites in terms of chemistry, with less common olivine gabbro, norite and bronzite picrite.

The basal zone consists of a chilled fine grained gabbro overlain by gabbro, norite and feldspar pyroxenites.

Distinctly developed crystals are rare, the mineral being usually found as foliated masses embedded in the igneous rocks norite and hypersthene-andesite, of which it forms an essential constituent.

A type of inselberg, bornhardts are typically composed of granites or gneisses, though occasionally formed in other rock types such as dacite, norite, limestone, sandstone and conglomerate.

Most of the samples obtained on the Apennine Front are KREEP (potassium, rare earth elements, phosphorus) materials, anorthosites, recrystallized norite, or recrystallized breccia.

Like enstatite, bronzite is a constituent of many mafic to ultramafic igneous rocks, such as, norite, gabbro, and especially peridotite, and of the serpentinites which have been derived from them.

Masses sufficiently large for cutting are found in the norite of the Kupferberg in the Fichtelgebirge, and in the serpentine of Kraubat near Leoben in Styria.

On a smaller scale, norite can be found in small localized intrusions such as the Gombak Norite in Bukit Gombak, Singapore.

These rock types include iron-rich diorite, gabbro, and norite; leucocratic mafic rocks such as leucotroctolite and leuconorite; and iron-rich felsic rocks, including monzonite and rapakivi granite.

In 1893, Dr T.H.Holland, the then Chief of the Geological Survey of India reported that the Hypderstehene granites found in Madras (Chennai) was associated with large masses of norite.

The coarse-grained labradorite-hypersthene-rock (norite) of the island of Paul off the coast of Labrador has furnished the most typical material; and for this reason the mineral has been known as Labrador hornblende or paulite.

The majority of the samples collected by the Apollo 15 astronauts from the Apennine Front are, other than KREEP (potassium, rare earth elements, phosphorus) materials, included anorthosite, and recrystallized norite and breccia.

The SIC is believed to be a stratified impact melt sheet composed from the base up of sublayer norite, mafic norite, felsic norite, quartz gabbro, and granophyre.

Lithologies vary from largely ultramafic peridotite, chromitite, harzburgite, and bronzitite in the lower sections to mafic norite, anorthosite, and gabbro toward the top, and the mafic Rustenburg Layered Suite is followed by a felsic phase (the Lebowa Granite Suite).

The igneous complex is elongated in a north west-south east direction, and includes norite, anorthosite, tonalite and diorite as the main rock types present, all of which have been metamorphosed since their intrusion and are termed meta-igneous rocks by the British Geological Survey in the published map, with terms metanorite, meta-anorthosite, etc. being used.

They may be named by adding orthopyroxene or specifically hypersthene to the normal igneous nomenclature (e.g. hypersthene-granite), but specific names are in widespread use such as norite, mangerite, enderbite, jotunite, farsundite, opdalite and charnockite (in the strict sense); equivalents of gabbro, monzonite, tonalite, monzodiorite, monzogranite, granodiorite and granite.

The principal difference between norite and gabbro, however, is the type of pyroxene of which it is composed; norite is predominately composed of orthopyroxenes, largely high magnesian enstatites, whereas the principal pyroxenes in gabbro are clinopyroxenes, generally medially iron-rich augites.