glaucophane
/ˈɡlɔːkəfeɪn
/noun [mass noun]
A bluish sodium-containing mineral of the amphibole group, found chiefly in schists and other metamorphic rocks.The mineral glaucophane, for example, has a pleochroism scheme of colourless, lavender, and sky blue....
- Some melange inclusions locally preserve glaucophane overprinted by actinolite.
- Undated glaucophane schists in the suture zone in Transbaikalia confirm the operation of subduction processes.
Origin
Mid 19th century: from German Glaukophan, from Greek glaukos 'bluish-green' + -phanēs 'shining'.