Basalt Gabbro Granite Rhyolite

Hardness of granite and rhyolite is 6 7.

Basalt gabbro granite rhyolite. Rhyolite is very closely related to granite. Classification of common igneous rocks based on texture and composition texture a. Granite is made from three commonplace minerals quartz mica and feldspar and when viewed from a distance appear tan pinkish or gray relying at the concentrations and grain sizes of the 3 minerals. Unlike granite gabbro is low in silica and has no quartz.

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. It is composed predominantly of quartz k feldspar and biotite. Lab 6 igneous rock samples red granite rhyolite diorite gabbro gray granite obsidian andesite basalt rhyolite tuff pumice lab 6 igneous rock samples red granite rhyolite diorite gabbro gray granite obsidian andesite basalt rhyolite tuff pumice lab exercise 2. Extrusive igneous rocks erupt onto the surface where they cool quickly to form small crystals.

Rhyolite is extrusive equivalent of granite magma. Examples of intrusive igneous rocks are diabase diorite gabbro granite pegmatite and peridotite. Some cool so quickly that they form an amorphous glass. Another reason is the internal crystalline structure of the silicate minerals.

These rocks include andesite basalt dacite obsidian pumice rhyolite scoria and tuff. It may have any texture from glassy aphanitic porphyritic and by the orientation of small crystals reflecting the lava flow. Properties of rock is another aspect for granite vs rhyolite. Trapped deep within the earth magma is authorized to cool slowly.

Appearance of granite is veined or pebbled and that of rhyolite is banded. Silicic granite rhyolite intermediate diorite andesite mafic gabbro basalt ultramafic peridotite komatiite combination of texture and composition produces rock name. Gabbro is a dark colored igneous rock that is considered to be the plutonic equivalent of basalt. Therefore more basalt than gabbro and more granite than rhyolite.

Granite is available in black grey orange pink white colors whereas rhyolite is available in grey white light black colors. It is composed mostly of the mineral plagioclase feldspar with smaller amounts of pyroxene and olivine. Magma volcanism and igneous rocks every igneous rock has a story to tell that geologists can unravel by considering the rock s. Gabbro is very similar to basalt in its mineral make up.

Gabbro obsidian granite and andesite. Felsic with an aphanitic texture so fine grained that their component mineral crystals are not detectable by the unaided eye. Also gabbro has no alkali feldspar only plagioclase feldspar with a high calcium content. It is composed predominantly of quartz k feldspar and biotite.

Examples of intrusive rocks are granite and gabbro.