Sandstone (Water-worn Pebble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Category
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Amber
Succinite (with approximate formula C10H16O)
mineraloid
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Tan/Brown)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Chert (specifically Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert / Yellow Jasper
Silicon Dioxide (SiO2)
sedimentary
Quartz (small fragment)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Limonite with Hematite
Hydrated iron(III) oxide-hydroxide with variable composition (FeO(OH)·nH2O)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxides)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Conglomerate
Conglomerate (Clastic sedimentary rock)
sedimentary
Precious Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Quartz Geode
Silicon dioxide (SiO2)
mineral
Quartz (Milky/Smoky variety on matrix)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Chert (Flint variety)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Druzy)
Crystalline Silicon Dioxide (SiO2)
mineral
Lemon Quartz (Orizaba/Citrinated Quartz)
Silicon Dioxide (SiO2) with iron impurities/treatment
mineral
Amethyst
Silicon Dioxide (SiO2) with traces of Iron (Fe3+)
mineral
Amethyst
Silicon Dioxide (SiO2) with Iron impurities
mineral
Pink Quartz (Rose Quartz)
Silicon Dioxide (SiO2)
mineral
Concretion
Septarian Concretion (Clay-Ironstone Nodules)
sedimentary
Milky Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Hematite
Hematite, Iron(III) oxide (Fe2O3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Dyed and Metallic Coated Agate Geode
Silicon Dioxide (SiO2) with titanium/gold vapor deposition coating
sedimentary (primary) with artificial modification
Pearl
Calcium carbonate (CaCO3) - Aragonite/Calcite variety
mineral
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Picture Jasper
Tectonically broken chalcedony (SiO2)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral