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Igneous rocks are usually classified by their chemical composition (acidic or basic), and by whether they formed underground (intrusive, characterised by large mineral crystals) or on the surface (extrusive, made of tiny, microscopic crystals). For instance, basalt is a basic, extrusive rock, and granite is an acidic, intrusive rock.
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Earn +20 ptsQ: What are two properties used to classify igneous rock?
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Can igneous rock be felsic?
Yes. Felsic is a term used to describe the composition of some igneous rocks.
What is the igneous rock in the United Kingdom that forms a circle used as a calendar long ago?
rock cycle
What 2 properties classify rocks?
They use the mineral composition, color, and texture.
What is the most abundant igneous rock that is hard and is mainly used in buildings and monuments?
granite
What do intrusive rock have in common with extrusive rocks?
Sedimentary rocks are not classified by the terms intrusive or extrusive. These are terms used specifically for igneous rock classification, referring to rock that has formed from melt either below or on the surface.
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