Glauconitic Sandstone (Greensand)
Glauconitic Sandstone ((K, Na)(Fe3+, Al, Mg)2(Si, Al)4O10(OH)2)
sedimentary
Category
Sedimentary (Base), Then Artificial
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Sandstone (River Rock)
Arenite (SiO2 based sedimentary rock)
sedimentary
Sparkling Druzy Quartz on Matrix
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Limestone Pebble
Calcium Carbonate (CaCO3)
sedimentary
Sandstone with Manganese Dendrites
Clastic Sedimentary Rock (SiO2 based with MnO2 inclusions)
sedimentary
Desert Varnish on Sandstone
Ferromanganese coating on Quartz Arenite
sedimentary
Sandstone (lithic wacke/conglomerate mix)
Clastic Sedimentary Rock (SiO2 with lithic fragments)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Bituminous Coal
Organic Sedimentary Rock (Carbon-based)
sedimentary
Sandstone pebble
Sandstone (Quartz-rich Arenite)
sedimentary
Weathered limestone or calcareous sandstone
Calcite-rich carbonate rock, chiefly calcium carbonate (CaCO₃), possibly fossiliferous limestone
sedimentary
Limestone pebble
Sedimentary rock, primarily calcium carbonate (CaCO3)
sedimentary
Quartz (Druzy / Goldstone Gemstone Cabochon)
Silicon Dioxide (SiO2)
gemstone
Fossilized Shark Tooth
Carcharocles sp. or similar Lamniformes
fossil
Limestone Pebble
Sedimentary carbonate rock (CaCO3)
sedimentary
Limestone with Fossil Fragment
Sedimentary carbonate rock (CaCO3)
sedimentary
Quartzite (or Chert/Flint gravel)
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Sandstone and River Pebbles
Sedimentary Rock (Sandstone / Quartzite / Chert)
sedimentary
Sandstone (Ferruginous)
Sandstone (primarily SiO2 with Iron Oxide cement)
sedimentary
Marcasite on Agate / Sphalerite-Pyrite Agate Geode Slice
Marcasite (FeS2) / Pyrite on Quartz (SiO2)
mineral
Sandstone (Ferruginous)
Sandstone (clastic sedimentary rock, mainly SiO2 with iron oxide cement)
sedimentary
Conglomerate (Red Sandstone variety)
Clastic Sedimentary Rock (Conglomeratic Sandstone)
sedimentary
Smoky Quartz
SiO2 (Silicon Dioxide)
Mineral
Sandstone Pebble
Arenite
sedimentary
Limestone with Fossil
Sedimentary limestone, calcium carbonate (CaCO3)
sedimentary
Colorless Quartz (Rhinestone)
Silicon Dioxide (SiO2)
mineral
Coal (Anthracite / Bituminous)
Organic Sedimentary Rock (Carbon-based)
sedimentary
Bituminous Coal
Organic Sedimentary Rock (Carbon-based)
sedimentary
Gravel and Sand Aggregate
Unconsolidated Clastic Sediment
sedimentary
Gravel
Unconsolidated rock fragments / detrital sediment
sedimentary
Sandstone
Arenite (mainly SiO2 with varying cements)
sedimentary
Chert (Flint Pebbles)
Microcrystalline Quartz (SiO2)
sedimentary
River Cobble (Mixed Lithology)
Clastic Sedimentary Rock (Silicified Siltstone or Wacke)
sedimentary
Limestone (Decorative Gravel)
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Chert (Field Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Hag Stone
Perforated Sedimentary Rock (typically Limestone or Sandstone)
sedimentary
Fossilized Shark Tooth
Carcharocles sp. or Striatolamia sp. (Phosphate/Carbonate mineralized Hydroxyapatite)
sedimentary
Bivalve Fossil
Bivalvia (Phylum Mollusca)
Fossil
Limestone (Micritic)
Sedimentary rock mainly composed of Calcium Carbonate (CaCO3)
sedimentary
Leopard Skin Jasper
Rhyolite (Silicon Dioxide with impurities), SiO2
igneous