Metals (molybdenite in quartz, chromite with chromium oxide, antimonite, pyrantimonite, arsenic, orpiment, realgar crystal, actaedre arsenite and pharmacakolite) - Chromolithography of Mineralogy by Gustav Adolph Kengott (1818-1897), extract from Histoire Naturelle by Gotthilf Heinrich von Schubert (1780-1860), 1886 - Metals including molybdenite in quartz, dirty chromite with oxide of chrome, antimonite, pyrantimonite, arsenic, orpiment, realgar crystal, arsenite octahedrons and pharmakolite - Chromolithograph from Dr. Aldolph Kenngott's “” Mineralogy”” section in Gotthilf Heinrich von Schubert's “” Naturgeschichte,””” Schreiber,” Ich, 1886