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They may be smooth and others may be rough. Smoothness/roughness is not a defining characteristic for igneous rocks.

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10y ago

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What is the luster of igneous rock?

i think that igneous and metamorphic rocks uses luster because maybe they have it in them


What are some common textures in igneous rocks?

hard rough and not smooth


Which terms best describe igneous rocks?

Calloused rock, or Subtraceaneal rock. Also, Ephyloceaeoulical-Pharchylogenic Carboniferincean Postulate Aggrevations is a fancy way of saying it.


Are all igneous rocks rough?

Any igneous rock, if ground down to a smooth face and polished, will be smooth. Any igneous rock, if cut, will display a jagged edge. There is the potential for any igneous rock to be smooth or rough. A pumice may be an exception, but pumice isn't all igneous rocks. Most igneous rocks are not vesicular. Pumice will always be rough. Obsidian is naturally smooth, though not perfect. It has conchoidal fracture, so it may show a smooth face, but this is not always the case. Any rock that has been tossed in a river or on a beach for a few thousand years will be pretty smooth, no matter what it is (except pumice). A rock fresh from the quarry will nearly always be jagged and rough. Due to the crystalline texture of igneous rocks, most will naturally fracture in a way that leaves a rough face, if that is what you meant.


When molten rocks cools what rocks form?

igneous rocks


What kinds of rock make up continental crust?

Continental crustal rocks can be igneous, metamorphic, or sedimentary, but the vast majority are igneous, most closely resembling granite in composition.


What are igneous rocks that form over the surface?

Rhyolititcen rocks.


What do you call rocks that have been formed from the hot molten material within the earth's crust that has cooled and hardened?

Igneous rocks are formed by the solidification of molten materials.


Are igneous rocks made up of igneous rocks?

Sedimentary rock can be made up partially of igneous clasts, but igneous rock is igneous rock.


Why do igneous rocks that cool quickly have smooth and shiny textures?

Igneous rocks that cool quickly do not have time to form large crystals. This results in a fine-grained texture that appears smooth and may reflect light in a shiny manner. Examples of these rocks include basalt and obsidian.


Why are igneous are called primary rocks?

Igneous rocks


Are volcanic rocks igneous rocks?

Yes. Volcanic rocks are extrusive igneous rocks.