First comes the distinction between fine grained (volcanic) and coarse grained (plutonic) rocks. After that the classification is based on mineral proportions.
For example the coarse grained equivalent of a basalt is a gabbro.
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Ahhh okay. I would love to get to know a bit more about rocls and make distinctions between them as volcanic or plutonic then igneous, sedimentary and metamorphic. That would be fun
Check out the Introduction by @mountainwashere
https://steemit.com/geology/@mountainwashere/rock-types-and-the-rock-cycle
Hey there, @josejirafa! I see your questions have been entertained by @sooflauschig, so I have no need to repeat them all! What he said are all true and I'm glad you are very curious to know more about geology. Just keep asking! :)
The fun part is really distinguishing these rocks from one another, even just among the three major classifications of igneous, sedimentary, and metamorphic!