Sandstone (likely Graywacke or Arkose)
Arenite
sedimentary
Category
Not A Rock (Synthetic Material)
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Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
River Pebble (Quartz-rich)
Silicon Dioxide (SiO2) with various inclusions
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartzwacke / Impure Sandstone
Arenite with minor lithic fragments (Silicon Dioxide matrix)
sedimentary
Asphalt (Aggregate)
Bituminous macadam / Concrete Aggregate
sedimentary
Gabbro (or Basalt Pebble)
Mafic Intrusive/Extrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Granite; primarily quartz (SiO₂), feldspar, and mica
igneous
Coquina or Fossilized Shell Aggregate
Calcareous bioclastic sedimentary rock (CaCO3)
sedimentary
Asphalt (Bituminous Rock)
Natural bitumen or Bituminous limestone/sandstone
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 principal component)
sedimentary
Fossilized Tooth
Vertebrate Fossilized Tooth (Mineralized Biogenic Material)
fossil
Poppy Jasper
Microcrystalline Quartz (SiO2) with hematite and other inclusions
sedimentary
Polished green aventurine (likely)
Quartzite dominated by quartz (SiO₂), commonly containing fuchsite mica
mineral
Sandstone (Quartzose)
Arenite (SiO2 principal)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Fire Opal (in Matrix)
Hydrated Silica (SiO2·nH2O)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (Banded)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily Quartz Arenite)
sedimentary
K2 Jasper
Azurite in Granite
igneous
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
igneous
Vesicular basalt (scoriaceous basalt)
Basalt, primarily plagioclase, pyroxene, and iron-rich olivine; vesicular variety may be termed scoria
igneous
Scoria (vesicular basalt)
Scoria; vesicular mafic volcanic rock, commonly basaltic in composition
igneous
Chert (Flint/Nodule)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 with assorted lithic fragments)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement (primarily SiO2 with Fe2O3/FeOOH)
sedimentary
Sandstone (with Iron Oxide)
Arenite with Limonite/Hematite staining
sedimentary
Granite / Diorite (Granodiorite)
Granodiorite / Quartz Diorite
igneous
Vesicular Basalt (Scoria)
Basalt (Extrusive Igneous Rock)
igneous
Banded Sandstone / Quartzite with Mineral Veins
Sedimentary rock (Quartz arenite with iron oxide/silica banding)
sedimentary
Sandstone (Greywacke/Lithic Sandstone)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Granite River Rock
Phaneritic Felsic Igneous Rock (Granite)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Red Sandstone
Sandstone (lithic arenite or arkose with iron oxide)
sedimentary
Red Sandstone
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Quartz-veined Limestone
Sedimentary limestone with quartz/calcite veinlets
sedimentary
Schist
Mica Schist (Medium-grade Metamorphic Rock)
Metamorphic