21. Mozarkite consists essentially of silica ( quartz-SiO 2 ) with varying amounts of chalcedony . 22. Chalcedony is voiced by Hiroshi Kamiya.23. One ring is set with an engraved gem of brown chalcedony 13 x 9.5mm. 24. Bloodstone, a dark greenish chalcedony marked by flecks of red, was reputed to preserve health. 25. Both carnelian and sard are varieties of the silica mineral chalcedony colored by impurities of iron oxide. 26. Associated minerals include quartz, chalcedony , pyrite, pyrrhotite, sphalerite, galena, chalcopyrite and calcite. 27. These chlorite schists are cross-cut in places by asbestos veins and coated by chalcedony or quartz. 28. The Wilton Industry is primarily characterized by microliths and hafted tools, often made from chalcedony or silcrete. 29. Chalcedony is more soluble than quartz under low-temperature conditions, despite the two minerals being chemically identical.30. Later, groundwater transported dissolved minerals through the vesicles depositing concentric bands of fine-grained quartz called chalcedony .
