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Pyroxene Library at Amethyst Gallery

The pyroxenes are an important group among the single chained inosilicates. They are common rock forming minerals and are represented in most igneous and many metamorphic rocks.

Their presence in a rock indicate a high temperature of crystallization with a lack of water. If water were present, a double chained amphibole would most likely have formed instead.

The name pyroxene comes from the Greek words for fire and stranger in a false allusion to their surprising presence in volcanic lavas.

Pyroxenes are sometimes seen as crystals embedded in volcanic glass and the assumption was that they are impurities in the glass, hence the term "fire strangers". However the pyroxenes are simply early forming minerals that crystallized before the lava erupted.