A colorless or white variety of the mineral tourmaline, valued as a gemstone for its transparency and brilliance.
From Greek 'a-' (without) + 'chroma' (color) + '-ite' (mineral suffix). The term emerged in mineralogy during the 19th century to describe tourmaline specimens lacking the typical color of their species.
Achroite is essentially nature's invisible gemstone—it's tourmaline with all the crystal structure and hardness but none of the color. This happens when there are no trace metal impurities to add pigment, showing how color in gems depends entirely on chemistry rather than structure!
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