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A bluish-gray or bluish-black monoclinic mineral of the amphibole group.

[German Glaukophan : Greek glaukos, bluish gray + Greek -phanēs, appearing (from phainesthai, phan-, to come to light, appear; see bhā- in Indo-European roots).]
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It consists of metagabroic rocks, garnet amphibolites, amphibole schists, quartz-sericite schists and quartzites of medium- to low-pressure, as well as lawsonite and glaucophane schists and eclogites of high pressure and serpentinized ultramafic rocks (Maya and Gonzalez, 1995).
The phosphorites are of pelletal type and commonly contain cellophane, dahlite, francolite, glaucophane, dolomite, iron oxide and pyrite in various proportions.
1982): Presence de glaucophane detritique dans le Maastrichtien inferieur de Sardaigne orientale.
For example, during the Neolithic, polished axes and chisels were made from greenschists and glaucophane schists in northern Italy (D'Amico 2005) and from glaucophane schists in the western Provence region of southern France (Ricq-de Bouard and Fedele 1993).
Blocks of glaucophane schist are found within serpentinite bodies and are composed of clinozoicite + glaucophane + chlorite + sodic plagioclase, minor titanite and calcite.
The crystals line seams in a hard, dark glaucophane schist from which the original calcite seam-fillings have been dissolved away.