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Pyroxene is a group of minerals.
Usually pyroxene crystallizes from magma before orthoclase. Pyroxene has a higher melting point than orthoclase, so it will crystallize first as the magma cools and reaches temperatures where pyroxene can form.
Peridotite is made only of olivine and pyroxene
Granite is a coarse grained igneous rock without Pyroxene.
Yes, pyroxene exhibits two distinct cleavage planes at nearly right angles to each other. The cleavage of pyroxene is considered good in one direction and poor in the other.