Basalt Gabbro Granite Rhyolite

Felsic with an aphanitic texture so fine grained that their component mineral crystals are not detectable by the unaided eye.

Basalt gabbro granite rhyolite.

Trapped deep within the earth magma is authorized to cool slowly. Extrusive igneous rocks erupt onto the surface where they cool quickly to form small crystals. Appearance of granite is veined or pebbled and that of rhyolite is banded. It is composed mostly of the mineral plagioclase feldspar with smaller amounts of pyroxene and olivine.

It is composed predominantly of quartz k feldspar and biotite. 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. Silicic granite rhyolite intermediate diorite andesite mafic gabbro basalt ultramafic peridotite komatiite combination of texture and composition produces rock name. Hardness of granite and rhyolite is 6 7.

Gabbro is a dark colored igneous rock that is considered to be the plutonic equivalent of basalt. These rocks include andesite basalt dacite obsidian pumice rhyolite scoria and tuff. Examples of intrusive rocks are granite and gabbro. Classification of common igneous rocks based on texture and composition texture a.

Gabbro is very similar to basalt in its mineral make up. Some cool so quickly that they form an amorphous glass. Intermediate with a phaneritic texture crystals are so coarse that individual minerals can be distinguished with the naked eye rhyolite. The difference is rhyolite has much finer crystals.

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. Rhyolite is very closely related to granite. Granite is available in black grey orange pink white colors whereas rhyolite is available in grey white light black colors. Examples of intrusive igneous rocks are diabase diorite gabbro granite pegmatite and peridotite.

Unlike granite gabbro is low in silica and has no quartz. 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. Also gabbro has no alkali feldspar only plagioclase feldspar with a high calcium content. Rhyolite is extrusive equivalent of granite magma.

Another reason is the internal crystalline structure of the silicate minerals. It may have any texture from glassy aphanitic porphyritic and by the orientation of small crystals reflecting the lava flow. Gabbro obsidian granite and andesite. Gabbro is a dark colored coarse grained intrusive igneous rock.

It is composed predominantly of quartz k feldspar and biotite.