You are handed two igneous rocks. One with large and well-formed beautiful crystals. Another rock is made of the same mineral type but the crystals are small and not well-formed.
What clues do the minerals in the igneous rock give about how the rock was formed?
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There are five primary types of intrusive igneous rocks with these large crystals: granite, pegmatite, diorite, gabbro and peridotite
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There are five primary types of intrusive igneous rocks with these large crystals: granite, pegmatite, diorite, gabbro and peridotiteAs magma cools slowly the minerals have time to grow and form large crystals. The minerals in a phaneritic igneous rock are sufficiently large to see each individual crystal with the naked eye. ... The result is an aphanitic rock with some larger crystals (phenocrysts) imbedded within its matrix.
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