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Basalt and rhyolite both are extrusive igneous rock that contains mineral crystals. However, the mineral crystals are normally less than 1 mm in diameter, and are therefore not discernible without magnification.

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What is a black intrusive rock with small crystals?

Intrusive rock normally has visible crystals. Extrusive igneous rock has small crystals. A black extrusive igneous rock with small crystals could be basalt.


What is an extrusive igneous rock with large crystals?

granite


How can you determine if an igneous rock has had an intrusive or extrusive organ?

by the size of the crystals, big crystals intrusive, small crystals extrusive


What is a identifying characteristic of extrusive igneous rock?

small crystals


How can you determine if a igneous rock has had an intrusive or extrusive origin?

== Grain size. Most intrusive igneous rocks will have visible crystals. Crystals in most extrusive igneous rocks are not easily visible.


Which kind of of igneous has more crystals extrusive or intrusive?

instrusive Rock


What is an igneous rock with small crystals?

If you're not looking for anything specific, any extrusive igneous rock will have smaller crystals, if any at all. This is because they cool quickly on the surface, leaving little time for crystals to form/grow.


What igneous rock has crystals that are not visible?

Extrusive igneous rock consists of mineral crystals that are not observable with the naked eye. Obsidian is an extrusive igneous rock (volcanic glass) where there technically are no mineral crystals.


Is volcanic glass an intrusive or extrusive igneous rock?

Volcanic glass is an extrusive igneous rock. It forms when molten lava cools quickly on the Earth's surface, preventing the formation of crystals.


When a igneous rock with large cystals cools what is it?

An intrusive igneous rock has larger crystals than an extrusive igneous rock because it has had a longer period of time to solidify underground.


Where would you expect to find an igneous rock with small crystals?

You would expect to find an igneous rock with small crystals near the Earth's surface where the rock cools relatively quickly, such as in volcanic eruptions or magma intrusions that do not have much time to grow large crystals. These rocks are known as volcanic or extrusive igneous rocks.


When Magma is launched from a volcano forms what type of rock?

A volcano is made of extrusive igneous rock. The specific type of igneous rock will vary from one volcano to another.