Caption:
Various minerals and crystals including kyanite, staurolite, andalusite, tourmaline, chiastolite, rubellite, cordierite, pyroxene, diopside, actinolite, amphibole, hypersthene, mountain leather, asbestos, serpentine, ophicalcite and eclogite. Chromolithograph from Dr. Aldolph Kenngott's "Mineralogy" section in Gotthilf Heinrich von Schubert's "Naturgeschichte," Schreiber, Munich, 1886.