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What is the mineral composition of gabbro?

What is the mineral composition of gabbro?


Type Igneous Rock
Chemical Composition Mafic
Color Dark Gray
Mineral Composition Calcium Plagioclase, Pyroxene
Miscellaneous Mostly Calcium Plagioclase

What is norite rock?

Norite is a coarse-grained basic igneous rock dominated by essential calcic plagioclase and orthopyroxene. The name Norite is derived from the Norwegian name for Norway: Norge. Norite may be essentially indistinguishable from gabbro without thin section study under the petrographic microscope.

What is the composition of Noritic gabbro?

Gabbro and norite are basic intrusive rocks composed principally of calcic plagioclase and pyroxene, with or without olivine. In gabbro the dominant ferromagnesian mineral is clinopyroxene, whereas it is orthopyroxene in norite.

How is norite formed?

Norite is generally found in layered igneous intrusions formed by progressive crystal fractionation. The crystallization of large amounts of orthopyroxene can occur by the reaction of olivine with the magma. Norite is sometimes associated with anorthosite and troctolite.

What is the importance of gabbro?

The most common use of gabbro is as a crushed stone or aggregate. Crushed gabbro is used as a base material in construction projects, as a crushed stone for road construction, as railroad ballast, and anywhere that a durable crushed stone is needed as fill.

What are the properties of gabbro?

Gabbro is a coarse-grained (phaneritic) igneous rock that is relatively low in silica and rich in iron, magnesium, and calcium. Such rock is described as mafic. Gabbro is composed of pyroxene and calcium-rich plagioclase, with minor amounts of hornblende, olivine, and accessory minerals.

Why is gabbro used in construction?

How does granite composition differ from that of gabbro?

Texture: Granite is a coarse-grained igneous rock with average grain size ranging from 1 to 25 millimeters. Gabbro is generally coarse grained, with crystals in the size range of 1 mm or greater.

What is composition of granite?

The principal constituent of granite is feldspar. Both plagioclase feldspar and alkali feldspar are usually abundant in it, and their relative abundance has provided the basis for granite classifications. The minor essential minerals of granite may include muscovite, biotite, amphibole, or pyroxene.