Gabbro Granite Rhyolite Basalt

These rocks include andesite basalt dacite obsidian pumice rhyolite scoria and tuff.

Gabbro granite rhyolite basalt. Home science math history literature technology health law. I am not a geologist and i defer to any geologists out there. What prompted this whole thing was when i found out that the absolute black sold as granite in the us and elsewhere is actually gabbro. Some cool so quickly that they form an amorphous glass.

Basalt and gabbro have a similar composition just the crystal size differs from different cooling rates same for rhyolite and granite. Examples of intrusive igneous rocks are diabase diorite gabbro granite pegmatite and peridotite. Gabbro is a dark medium to coarse grained intrusive igneous rock composed of calcium plagioclase pyroxene and minor olivine but no quartz. 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 coarse grained intrusive igneous rock. Gabbro is very similar to basalt in its mineral make up. Classification of common igneous rocks based on texture and composition texture a. 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.

Granite is available in black grey orange pink white colors whereas rhyolite is available in grey white light black colors. As nouns the difference between rhyolite and gabbro is that rhyolite is geology an igneous volcanic extrusive rock of felsic composition with aphanitic to porphyritic texture while gabbro is rock a name originally given to a kind of serpentine and now generally used for a coarsely crystalline igneous rock consisting of lamellar pyroxene and labradorite. Therefore more basalt than gabbro and more granite than rhyolite. Properties of rock is another aspect for granite vs rhyolite.

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. The difference is rhyolite has much finer crystals. Gabbro and basalt differ in that basalt like rhyolite is volcanic. 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. Gabbro is actually intrusive basalt equivalent but unlike basalt gabbro it has a variable variable mineral content. Hardness of granite and rhyolite is 6 7. Extrusive igneous rocks erupt onto the surface where they cool quickly to form small crystals.

Rhyolite is very closely related to granite.