Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
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Iron-stained quartz-bearing rock
Quartz (SiO₂), likely in a limonite/goethite-rich matrix
mineral
Feldspathic Gneiss (Granite Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Sandstone (Ferruginous)
Arenite with Iron Oxide matrix
sedimentary
Sandstone
Sandstone (Siliciclastic Sedimentary Rock)
sedimentary
Banded River Cobble with Mafic Dike
Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion
igneous and sedimentary
Quartzite / Chert Nodular Rock
Silicon Dioxide (SiO2) / Microcrystalline Quartz
sedimentary
Sandstone (Greywacke/Lithic Sandstone)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Chert (specifically Jasper/Brown Chert)
Silicon Dioxide (SiO2)
sedimentary
Coquina
Bioclastic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Quartz with Limonite Staining
Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)
Mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Sandstone (Calcareous)
Clastic sedimentary rock (primarily SiO2 with CaCO3 cement)
sedimentary
Peridotite (with Olivine)
Peridotite (rich in Olivine, (Mg,Fe)2SiO4)
igneous
Chert (Chalcedony/Flint)
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Sandstone (SiO2-rich detrital sedimentary rock)
sedimentary
Schist
Mica Schist
metamorphic
Quartzite Cobble
Quartzite (principally SiO2)
metamorphic
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)
sedimentary
Chert / Jasper
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (SiO2 + various cementing minerals)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite or arkose)
sedimentary
Schist
Mica Schist (Metamorphic Rock)
metamorphic
Greenstone
Metabasalt / Greenschist facies rock
metamorphic
Chert (specifically Flint or Jasper variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Yellow/Tan)
Microcrystalline Quartz (SiO2)
sedimentary
Agate (specifically a Thunderegg/Agate Nodule)
Cryptocrystalline Quartz (SiO2)
mineral
Ocellar Rhyolite
Rhyolite (featuring orbicular/ocellar quartz and feldspar textures)
igneous
Sandstone (likely Quartzose Sandstone pebble)
Arenite (primarily SiO2)
sedimentary
Fossil Coral
Scleractinia (Anthos), primarily Calcium Carbonate (CaCO3)
sedimentary
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Travertine (Calcareous Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Micaceous)
Clastic Sedimentary Rock - Micaceous Litharenite (SiO2 principal)
sedimentary
Chert (and Limestone) River Cobble
Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Quartz (Water-worn Pebble)
Silicon Dioxide (SiO2)
mineral
Yellow Jasper
Silicon Dioxide with iron inclusions (SiO2)
sedimentary
Sandstone (Ferruginous)
Clastic Sedimentary Rock (Sandstone)
sedimentary
Conglomerate (or Breccia)
Clastic Sedimentary Rock (Conglomeratic)
sedimentary
Basalt (Pahoehoe texture)
Mafic Volcanic Rock
igneous
Amethyst-bearing quartz cluster
Quartz, SiO₂; purple coloration from irradiation and trace iron
mineral