The pyroxenes are a group of important rock-forming silicate minerals found in many igneous and metamorphic rocks. The name pyroxene comes from the Greek words for fire and stranger. It was named that way due to their presence in volcanic lavas, where they are sometimes seen as crystals embedded in volcanic glass; it was assumed they were impurities in the glass, hence the name “fire strangers”. However, they are simply early forming minerals that crystallized before the lava erupted.
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