File:Plate IV- Quartz and Opal - DPLA - 8c000fd0258fff88cf23f36d42caefb4.jpg

Figures 1-20. Quartz and Opal. 1. Grey and White Striped Flint 2. Carnelian 3. Fortification Agate 4. Clouded Agate 5. Puddingstone or Quartz Conglomerate 6. Vitrified Tube 7. Wood Opal 8. Chrysoprase 9. Black and White Marked Agate 10. Black Ribbon Agate 11. Dark Brown Ribbon Agate 12. Horny-Coloured Agate 13. Sardonyx or Sard 14. Onyx 15. Red Dotted Agate 16. Brecciated Agate 17. Red Striped Agate 18. Variegated Striped Agate 19. Precious Opal 20. Green Opal This hand-colored plate is part of the first edition English translation of the German Das Mineralreich in Bildern. The publication consists of two sections; the first is an introduction including topics such as the formation of crystals and chemical reactions of crystals; the second is devoted to the description of various mineral groups including precious stones, hornblende and augitic minerals, felspathic minerals, micaceous minerals, zeolitic minerals, calcareous minerals, and various salts and compounds. The final pages of the book contain twenty-four lithograph plates depicting crystalline structures and mineral forms. The first two plates are labeled A and B and the remaining plates are numbered I through XXII. The plates are hand-colored, using metallic finishes to create a lustrous effect.