Limonite or Goethite (Ironstone)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Category
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Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Amethyst and Rose Quartz Beads
Crystalline Quartz (SiO2) with trace elements
gemstone
Brown Chalcedony (Agate/Jasper)
Cryptocrystalline Quartz (SiO2)
mineral
Amethyst
Quartz (Silicon Dioxide with iron impurities), SiO2
mineral
Citrine
Silicon dioxide (SiO2)
mineral
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Quartzite
Quartzite (mostly SiO2)
metamorphic
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Chert (SiO2)
sedimentary
Carnelian Agate Nodule
Chalcedony (SiO2) with Iron Oxide inclusions
sedimentary
Chert Arrowhead
Cryptocrystalline Quartz (SiO2)
sedimentary
Banded Jasper
Silicate Mineral (Microcrystalline Quartz / SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxide)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Aura Quartz
Silicon Dioxide (SiO2) with metallic vapor coating
mineral
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Chert Pebble
Cryptocrystalline Quartz (SiO2)
sedimentary
Clear Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Vuggy or Chalcedony)
Cryptocrystalline Quartz (SiO2)
sedimentary
Rose Quartz
SiO2 (Silicon Dioxide)
gemstone
Chert (Flint/Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone
CaCO3 (with biological inclusions)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Chalcedony (Agate)
Cryptocrystalline Quartz (SiO2)
sedimentary
Dalmatian Jasper
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Flint
Silicon Dioxide (SiO2) - Chert variety
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Chert (Flint Nodules)
Silicon Dioxide (SiO2)
sedimentary
Siltstone Concretion
Carbonate-cemented Siltstone Concretion
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary