Basalt Gabbro Granite Rhyolite

Gabbro is a dark colored coarse grained intrusive igneous rock.

Basalt gabbro granite rhyolite. It may have any texture from glassy aphanitic porphyritic and by the orientation of small crystals reflecting the lava flow. It is composed predominantly of quartz k feldspar and biotite. Gabbro is very similar to basalt in its mineral make up. Gabbro is a dark colored igneous rock that is considered to be the plutonic equivalent of basalt.

Unlike granite gabbro is low in silica and has no quartz. Some cool so quickly that they form an amorphous glass. 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. Examples of intrusive igneous rocks are diabase diorite gabbro granite pegmatite and peridotite.

Hardness of granite and rhyolite is 6 7. Examples of intrusive rocks are granite and gabbro. Rhyolite is very closely related to granite. Properties of rock is another aspect for granite vs rhyolite.

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. The difference is rhyolite has much finer crystals. Rhyolite is extrusive equivalent of granite magma. It is composed mostly of the mineral plagioclase feldspar with smaller amounts of pyroxene and olivine.

Also gabbro has no alkali feldspar only plagioclase feldspar with a high calcium content. Another reason is the internal crystalline structure of the silicate minerals. Gabbro obsidian granite and andesite. Silicic granite rhyolite intermediate diorite andesite mafic gabbro basalt ultramafic peridotite komatiite combination of texture and composition produces rock name.

Classification of common igneous rocks based on texture and composition texture a. 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. 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.

Intermediate with a phaneritic texture crystals are so coarse that individual minerals can be distinguished with the naked eye rhyolite. 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. These rocks include andesite basalt dacite obsidian pumice rhyolite scoria and tuff.

Magma volcanism and igneous rocks every igneous rock has a story to tell that geologists can unravel by considering the rock s.