Lightning Stone / Fulgurite-impregnated or Septarian-like Agate
Silicon dioxide (Quartz/Chalcedony) with host rock matrix
sedimentary
Category
Man Made Rock (Sedimentary Analogue)
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Carnelian
Silicon Dioxide (Variety of Chalcedony, SiO2)
gemstone
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Jasper / Chalcedony
Silicon Dioxide (SiO2) with iron inclusions
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Geode (Unopened)
Silicon Dioxide (SiO2) in sedimentary vugs
sedimentary
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral
Jasper Chert Nodules
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Chert (Flint Nodules)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Travertine
Calcareous Tufa / Travertine (CaCO3)
sedimentary
Chert (Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Quartz-encrusted Matrix
Silicon Dioxide (SiO2) with Ferruginous Sandstone
sedimentary
Agate with Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Carnelian (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Ferruginous Sandstone (Ironstone)
Sedimentary rock with Limonite/Goethite cement
sedimentary
Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Chert (Chalcedony/Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
River Cobble (Quartzite / Sandstone Gravel)
SiO2 (Quartz-rich sedimentary/metamorphic rock)
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Dalmatian Stone
Dalmatian Stone (formerly called Dalmatian Jasper)
igneous
Sandstone
Arenite
sedimentary
Chert (River Pebble)
Cryptocrystalline Quartz (SiO2)
sedimentary
Soft Limestone
Calcite-rich Sedimentary Rock (CaCO3)
sedimentary
Jasper Pebble
SiO2 (Microcrystalline Quartz)
sedimentary
Sandstone (Ferruginous)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 with assorted lithic fragments)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary
Sandstone
Clastic Sedimentary Rock (composed mostly of quartz and/or feldspar)
sedimentary
Vuggy Limestone
Carbonate Sedimentary Rock with Vuggy Porosity (CaCO3)
sedimentary
Chalcedony
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Weathered sandstone or arkose fragment
Quartz-rich clastic sedimentary rock; likely sandstone/arkose (dominantly SiO₂ quartz with feldspar and lithic grains)
sedimentary
Piddock bored rock (likely Mudstone or Shale)
Ichnofossil (Gastrochaenolites borings) in Fine-grained Sedimentary Rock
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Limestone (River Stone)
Calcite-rich Sedimentary Rock (CaCO3)
sedimentary