Chert (often called Flint in dark varieties)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Man Made Rock (Sedimentary Analogue)
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Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Gneiss
Gneissic Metamorphic Rock
metamorphic
Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Quartz Geode
Quartz (Silicon Dioxide - SiO2) within a Chalcedony and Limonite shell
sedimentary
Sandstone
Arenite
sedimentary
Shale or Argillite
Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)
Sedimentary or Metamorphic (low grade)
Sandstone
Arenite (primarily Quartz-based Sandstone)
sedimentary
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Sandstone (Weathered Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Sand Dollar Fossil
Echinoidea (Clypeasteroida)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Sandstone Pebbles
Arenite (primarily SiO2 with mineral cement)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Dalmatian Stone
Dalmatian Jasper (a trade name for an igneous microcrystalline rock composed mostly of feldspar, quartz, and dravite)
igneous
Sandstone
Arenite (predominantly Quartz Sandstone)
sedimentary
Sandstone
Arenite (SiO2 based typically)
sedimentary
River Stone (River Pebble)
Rounded Sedimentary Rock (Lithic Clast)
sedimentary
Yellow Chalcedony (likely Carnelian or Agate)
Silicon dioxide (SiO2)
mineral
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Agate Geode with Quartz Druzy
Chalcedony (SiO2) and Quartz (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Coquina / Shelly Sandstone
Calcareous Sandstone / Coquina
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz with Hematite/Limonite oxides)
sedimentary
Sandstone (lithic wacke/arenite)
Clastic sedimentary rock (SiO2 + varied clasts)
sedimentary
Limestone (River Pebble)
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (Siliclastic sedimentary rock), SiO2 + various minerals
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate with Fossils)
sedimentary
Mixed Rock Collection (Pebbles and Stones)
Various geological specimens
igneous, sedimentary, and metamorphic
Sandstone (Picture Sandstone)
Arenite (primarily SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
River Pebble (likely Quartzite or Chert)
Sedimentary Clast (Silicon Dioxide dominant)
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz with Fe2O3 staining)
sedimentary
Chert (within Limestone)
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 dominated)
sedimentary