Basalt Gabbro Granite

ə b eɪ s or dolerite or microgabbro is a mafic holocrystalline subvolcanic rock equivalent to volcanic basalt or plutonic gabbro diabase dikes and sills are typically shallow intrusive bodies and often exhibit fine grained to aphanitic chilled margins which may contain tachylite dark mafic glass.

Basalt gabbro granite.

Earth contains three kinds of rocks namely igneous rocks sedimentary rocks and metamorphic rocks basalt and granite are two types of igneous rocks. In order to form granite magma needs a good hard squeeze so its component materials can separate and form large crystals. Gabbro is a dark medium to coarse grained intrusive igneous rock composed of calcium plagioclase pyroxene and minor olivine but no quartz. Gabbro is an intrusive igneous rock which is chemically equivalent to plutonic basalt.

Gabbro granite and basalt are essentially the same material in different forms. Gabbro is actually intrusive basalt equivalent but unlike basalt gabbro it has a variable variable mineral content. Diabase is the preferred name in north america while dolerite is. Extrusive igneous rocks erupt onto the surface where they cool quickly to form small crystals.

These rocks include andesite basalt dacite obsidian pumice rhyolite scoria and tuff. Examples of intrusive igneous rocks are diabase diorite gabbro granite pegmatite and peridotite. Therefore more basalt than gabbro and more granite than rhyolite. Gabbro is sometimes called black granite for it too is coarse grained but a large proportion of iron bearing minerals make gabbro heavier and dark colored.

The key difference between basalt and granite is that basalt is mostly occurring on ocean floors while granite is in the crust of the earth in all continents. Mafic magmas crystallize to form relatively simple atomic structures isolated tetrahedra and single chains and therefore flow easily the higher mafic temperatures also contribute to this ease of movement. If magma cools very quickly upon contact with air or water it will form basalt. Gabbro can also be gray or light green.

Generally stratification of light and dark minerals layered gabbro significant amounts of olivine olivine gabbro or high percentage of coarse crystals of plagioclase feldspar löcogabbro. Gabbro ˈ ɡ æ b r oʊ is a phaneritic coarse grained mafic intrusive igneous rock formed from the slow cooling of magnesium rich and iron rich magma into a holocrystalline mass deep beneath the earth s surface. Diabase ˈ d aɪ. Some cool so quickly that they form an amorphous glass.

Slow cooling coarse grained gabbro is chemically equivalent to rapid cooling fine grained basalt much of the earth s oceanic crust is made of gabbro formed at mid ocean. All rocks of igneous origin consist of magma or molten earth that finds its way up to. The process of formation of rocks is different for various rocks. These rocks are composed of many distinct minerals.

Gabbro is coarse grained while basalt is fine grained. Granite is a medium tocoarse grained acid igneous rock with essential quartz 20 and feldspar where alkali feldspar constitutes between 100 and 35 of the feldspars and minor mafic minerals.