What is fine grained extrusive igneous rock?
Extrusive or volcanic rocks crystallize from lava at the earth’s surface. On the other hand, lavas cool quickly at the earth’s surface and are characterized by fine-grained texture, in which the crystals are too small to be seen by the unaided eye.
Why are igneous rocks fine grained?
How Extrusive Igneous Rocks are Formed: While molten, they flow out onto the surface or flow into cracks near the Earth’s surface. They cool quickly with no time for large crystals to grow. They are, thus, very fine grained.
What is a fine grained mineral?
i. Said of a crystalline rock, and of its texture, in which the individual minerals are relatively small; specif. said of an igneous rock whose particles have an average diameter less than 1 mm. For broadly classifying igneous rocks, fine grained means an average diameter <2 mm.
How is fine grained igneous rock formed?
Fine-grained igneous rocks form when lava cools quickly at Earth’s surface.
What is a fine grained rock called?
Fine grained rocks are called “extrusive” and are generally produced through volcanic eruptions. Granite and gabbro are examples of phaneritic igneous rocks. Fine grained rocks, where the individual grains are too small to see, are called aphanitic. Basalt is an example. The most common glassy rock is obsidian.
How are fine grained igneous rocks formed?
What is felsic igneous rock?
In geology, felsic is an adjective describing igneous rocks that are relatively rich in elements that form feldspar and quartz. Felsic magma or lava is higher in viscosity than mafic magma/lava. Felsic rocks are usually light in color and have specific gravities less than 3. The most common felsic rock is granite.
What does fine-grained mean in business?
Fine-grained – smaller components of which the larger ones are composed, lowerlevel service.