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11Silicon dioxide — Silica redirects here. For other uses, see Silica (disambiguation). Silicon dioxide …
12Chalcedony — A cut and polished Chalcedony geode General Category Oxide mineral Chemical formula …
13Carnelian — For other uses, see Carnelian (disambiguation). Cornelian redirects here. For other uses, see Cornelian (disambiguation). Sard redirects here. For other uses, see Sard (disambiguation). Carnelian / Sard Polishe …
14Opal — For other uses, see Opal (disambiguation). Opal An opal bracelet. The stone size is 18 by 15 mm (0.7 by 0.6 in) General Category …
15Chert — For the Spanish municipality, see Xert. Chert Chert (  / …
16Onyx — A slice of sardonyx (width = 2.5 cm) General Category Oxid …
17Quartzite — Swan Peak Quartzite (Ordovician) ex …
18Cristobalite — spheres formed via devitrification (loss of silica) from the obsidian matrix (California, USA) 5.9×3.8×3.8 cm. General Category Silicate mineral …
19Coesite — Atomic structure of coesite Coesite[p] is a form (polymorph) of silicon dioxide SiO2 that is formed when very high pressure (2–3 gigapascals), and moderately high temperature (700 °C or 1,300 °F), are applied to quartz. Coesite was… …
20Chrysoprase — This article is about the mineral. For the fictional character, see Trolls (Discworld). Chrysoprase (Poland) Chrysoprase, chrysophrase or chrysoprasus is a gemstone variety of chalcedony (a cryptocrystalline form of silica) that contains small… …
