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