page_title: Glaucophane
hierarchical_section_title: Glaucophane
caption_attribution_description: English: Glaucophane and Fuchsite (Var. of Muscovite) Locality&#160;: Groix Island, Groix, Morbihan, Brittany, France Size 6.5 x 5.2 x 3.6 cm Français&#160;: Glaucophane et Fuchsite (Var. de Muscovite) Localité&#160;: Ile de Groix, Groix, Morbihan, Bretagne, France Taille&#160;: 6.5 x 5.2 x 3.6 cm
context_page_description: Glaucophane is the name of a mineral and a mineral group belonging to the sodic amphibole supergroup of the double chain inosilicates, with the chemical formula ☐Na₂Si₈O₂₂(OH)₂.
  Glaucophane crystallizes in the monoclinic system.
context_section_description: Glaucophane is the name of a mineral and a mineral group belonging to the sodic amphibole supergroup of the double chain inosilicates, with the chemical formula ☐Na₂(Mg₃Al₂)Si₈O₂₂(OH)₂.
  Glaucophane crystallizes in the monoclinic system.
caption: Bleu Gemm glaucophane with fuchsite
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