Granite pebble
Granite, typically quartz–feldspar–mica aggregate
igneous
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Likely tumbled greenstone (identity uncertain)
Greenstone: metamorphosed mafic volcanic rock, commonly composed of chlorite, actinolite, and epidote
metamorphic
Basalt Pebble / River Stone
Basalt (Mafic Extrusive Igneous Rock)
igneous
Shale (or Mudstone)
Laminose Mudrock (composition: clay minerals, quartz, and mica flakes)
sedimentary
Vesicular Basalt (or Scoria)
Extrusive Igneous Rock (Mafic)
igneous
Basalt
Extrusive Igneous Rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Basalt
Mafic extrusive igneous rock
igneous
Basalt
Extrusive igneous rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Basalt Cobble
Vesicular Basalt (Mafic Extrusive)
igneous
Granodiorite
Granodiorite
igneous
Metaconglomerate
Metaconglomerate (Quartzite conglomerate)
metamorphic
Dalmatian Jasper
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Vesicular Basalt (Lava Rock)
Basalt
igneous
Fossil Coral
Rugose Coral or Tabulate Coral (Phylum Cnidaria)
fossil
Basalt
Extrusive Igneous Rock
igneous
Quartz (Clear/Smoky Geode fragment)
Silicon Dioxide (SiO2)
mineral
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Weathered granite or granitic gneiss
Granite; primarily quartz, feldspar, and mica
igneous
Rounded granite or granitic gneiss pebble
Granite, chiefly quartz, feldspar, and mica; exact identification requires testing
igneous
Weathered granite or granitic gneiss
Granite; primarily quartz, feldspar, and mica
igneous
Fossilized Shell Impression / Siltstone Fossil
Bivalvia / Brachiopoda mold in Siltstone
fossil
Granite Cobble
Phaneritic Felsic Igneous Rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Calcite (or Travertine / Limestone)
Calcium Carbonate (CaCO3)
sedimentary
Diorite
Intermediate plutonic igneous rock
igneous
Granite
Granite (composed primarily of Quartz SiO2, Potassium Feldspar KAlSi3O8, and Plagioclase)
igneous
Banded Iron Formation (Fragment)
Banded Iron Formation (BIF)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Sandstone
Clastic sedimentary rock (Quartz arenite or arkose)
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Geode with Quartz and possibly Jasper/Hematite
Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides
Mineral/Sedimentary Geode
Basalt Pebble (Vesicular / Beach Cobble)
Basalt (mafic extrusive igneous rock)
igneous
Jasper
Silicon dioxide (SiO2)
mineral
Granite / Quartzite Specimen
Granite / Quartz (SiO2 with Feldspar and Mica)
igneous
Chert Pebble
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Yellow Quartzite (River Pebble)
Quartzite (SiO2)
metamorphic
Granodiorite (Weathered)
Granodiorite
igneous
Rounded river pebble, likely quartz-rich stone
Unidentified lithic clast; exact mineralogy cannot be determined from the image
sedimentary