A type of mineral that is a variety of pyroxene, known for its distinctive bronzy or iridescent appearance.
From Greek diallassein (to exchange or change), referring to its iridescent play of colors. The suffix -age indicates a mineral or rock-type. This geological term dates to the 19th century.
Diallage's name literally means 'interchange' because when you look at it, the light bounces around creating an optical effect that makes it seem to shift between different colors and hues as you turn it.
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