One of the mysteries of the English language finally explained.
A bluish sodium-containing mineral of the amphibole group, found chiefly in schists and other metamorphic rocks.
- ‘Undated glaucophane schists in the suture zone in Transbaikalia confirm the operation of subduction processes.’
- ‘The mineral glaucophane, for example, has a pleochroism scheme of colourless, lavender, and sky blue.’
- ‘Some melange inclusions locally preserve glaucophane overprinted by actinolite.’
Mid 19th century: from German Glaukophan, from Greek glaukos ‘bluish-green’ + -phanēs ‘shining’.
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