Sandstone
Arenite (primarily SiO2)
sedimentary
Category
Not A Rock
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Yellow Jasper
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (Silicon Dioxide, SiO2 based)
sedimentary
Chalcedony (Common Agate)
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Arenite (primarily SiO2 with Fe2O3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossilized Brachiopod
Brachiopoda (e.g., Rhynchonellida or Spiriferida)
sedimentary
Sandstone (River Cobble)
Clastic Sedimentary Rock (primarily Quartz with Feldspar)
sedimentary
Gneiss
Gneiss
metamorphic
Quartz / Common Agate
Silicon Dioxide (SiO2)
mineral
Sandstone with Desert Varnish
Arenite with Ferromanganese patina
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Banded Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Clear Quartz Crystal
Quartz (Silicon Dioxide, SiO2)
mineral
Granodiorite (River Pebble)
Granodiorite
igneous
Sandstone
Arenite
sedimentary
Scoria (Red Lava Rock)
Scoria
igneous
River Rock
Fluvial Cobble (typically Quartzite or Sandstone)
sedimentary
Gneiss
Gneiss
metamorphic
Basalt
Basalt (Vitreous to Aphanitic Mafic Igneous Rock)
igneous
Tiger Diamond / Hematite-infused Quartzite
Silicified Hematite-Rich Quartzite (SiO2 + Fe2O3)
metamorphic
Gold Ore in Quartz/Schist
Auriferous Quartz and Sulfide-bearing Schist
Metamorphic/Igneous (Hydrothermal)
Limonite (Iron Ore)
Limonite (Hydrous iron(III) oxide-hydroxide mixture, primarily FeO(OH)·nH2O)
mineral
Rhyolite
Rhyolite (felsic extrusive igneous rock)
igneous
Geodude
Geodude (Rock Pokémon: No. 74)
igneous
River Cobble (likely Basalt or Mafic Igneous Rock)
Extrusive Mafic Igneous Rock (e.g., Basalt)
igneous
Basalt Pebble
Basalt (Mafic volcanic rock)
igneous
Granite River Cobble
Phaneritic Felsic Igneous Rock
igneous
Sandstone with Secondary Mineral Encrustation
Arenite with Silica/Calcite deposits (SiO2 or CaCO3)
sedimentary
Chert (Brecciated Chert)
Silicon Dioxide (SiO2)
sedimentary
Druzy Quartz Geode (likely Smokey Quartz variety)
Silicon Dioxide (SiO2) - specifically a geode formation lined with druzy quartz crystals, with a likely brownish hue indicating smokey quartz.
Mineral structure/Rock
Porphyry
Porphyritic Igneous Rock
igneous
Basalt River Cobble
Basalt (Composition primarily Plagioclase Feldspar and Pyroxene)
igneous
Coral Fossil (Favosites type)
Phylum Cnidaria, Class Anthozoa (often CaCO3 - Calcium Carbonate)
sedimentary
Weathered Basalt with Iron Staining
Mafic Igneous Rock
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Unakite (or Epidote-rich Granite)
Unakite (Metamorphosed Granite consisting of Epidote, Orthoclase, and Quartz)
metamorphic
Basalt with Hematite staining
Extrusive mafic igneous rock with Fe2O3
igneous
Basalt River Stone
Aphanitic Mafic Igneous Rock (Basalt)
igneous
Basalt
Aphanitic mafic volcanic rock (primarily plagioclase feldspar and pyroxene)
igneous
Schorl (Black Tourmaline) in Granite
NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
igneous