What are the other types of igneous rocks based on its texture and give examples?

What are the other types of igneous rocks based on its texture and give examples?

There are six main types of textures; phaneritic, aphanitic, porphyritic, glassy, pyroclastic and pegmatitic. Aphanitic (a = not, phaner = visible) rocks in contrast to phaneritic rocks, typically form from lava which crystallize rapidly on or near Earth’ surface.

What is the rarest type of igneous rock?

Komatiite

What does igneous rocks look like?

Extrusive, or volcanic, igneous rocks look dull and do not sparkle much because they are fine grained. These crystals make a coarse-grained igneous rock called plutonic, or intrusive, igneous rock because the magma was intruded into cracks deep under the earth’s surface.

What name is given to deep seated intrusive igneous rocks?

Batholiths: are large, deep-seated intrusions (sometimes called Plutons) that form as thick, viscous magma slowly makes its way toward the surface, but seldom gets there!

Is granite a plutonic or volcanic rock?

Basalt and obsidian are volcanic rocks; granite is plutonic. Ask students how they can determine this. The answer is: plutonic rocks (such as granite) cool slowly in a relatively undisturbed environment permitting the growth of large mineral crystals which can easily be seen by the unaided eye.

What is plutonic igneous rocks?

Intrusive igneous rocks, formed by the slow solidification of magma deep below the surface and characterized by large crystals. Named after Pluto, the Roman god of the underworld. Examples include granite, gabbro and peridotite.

What is the difference in Plutonic and extrusive igneous rocks?

Volcanic rocks are rocks formed when lava cools and solidifies on the earth’s surface. Volcanic rocks are also known as ‘extrusive igneous rocks’ because they form from the ‘extrusion,’ or eruption, of lava from a volcano. Plutonic rocks are rocks formed when magma cools and solidifies below the earth’s surface.

Is gabbro a plutonic rock?

Gabbros are plutonic rocks formed by cooling and crystallization of molten magma trapped under the Earth’s surface and chemically equivalent to extrusive basalt.

What do plutonic rocks form?

Plutonic rocks are formed when magma cools and solidifies underground. Volcanic rocks are formed from lava that flows on the surface of the Earth and other planets and then cools and solidifies. The texture of an igneous rock depends on the size of the crystals in the rock.

Is dolerite a hypabyssal rock?

Dolerite is typically found as a hypabyssal igneous rock, typically within dykes, however, it may also occur in sills. Tholeiitic dolerite and alkali dolerite are the two types.