Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Category
Industrial Byproduct (Anthropogenic Rock)
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Almandine Garnet in Schist
Almandine, Fe3Al2(SiO4)3
metamorphic
Unidentified gray stone
Likely quartz-rich stone; exact identification is not possible from the image
mineral
Rough Sapphire (Corundum)
Corundum (Al2O3)
mineral
Mica Schist (with Garnet)
Garnet-Mica Schist
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcite-rich Sedimentary Rock (CaCO3)
sedimentary
Pumice
Pumicite (Amorphous volcanic glass)
Igneous
Quartz Druzy on Geode Fragment
Silicon Dioxide (SiO2)
mineral
Ironstone (likely Limonite or Goethite)
Ferruginous sedimentary rock (FeO(OH)·nH2O)
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Pumice
Pumice (Alveolar Rhyolite / Dacite / Andesite)
igneous
Weathered river pebble, likely quartz-rich sandstone or iron-stained quartzite
Provisional identification: quartz-rich sandstone/quartzite; exact composition cannot be confirmed from the image
sedimentary
River Stone (Quartzite)
Metamorphic Quartzite (primarily SiO2)
metamorphic
River Quartzite / Tumble-Polished Quartz
Quartzite (SiO2)
metamorphic
Weathered iron-rich rock, possibly meteorite
Uncertain; likely goethite/hematite-rich material, with meteorite possibility
mineral
Basalt (Water-worn Pebble)
Basalt (Mafic volcanic rock)
Igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Graywacke
Lithic Sandstone (Graywacke)
sedimentary
Basalt
Basalt (dominated by plagioclase feldspar, pyroxene, and olivine)
igneous
Basalt
Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)
igneous
Red Jasper
Jasper (SiO2) with Hematite (Fe2O3) inclusions
sedimentary
Ironstone
Ferruginous Sedimentary Rock (composed of Goethite, Hematite, and Limonite)
sedimentary
Diamond Druzy (Crystalline Diamond)
Carbon (C)
mineral
Garnet Gneiss
Gneiss containing almandine-pyrope garnet
metamorphic
Riverstone Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Pumice
Pumice (a highly vesicular volcanic rock)
igneous
Portable Ceramic Space Heater
Polished Acrylonitrile Butadiene Styrene (ABS) Plastic with Ceramic Heating Elements
not a rock (synthetic/industrial object)
Granodiorite (containing Biotite and Quartz)
Granodiorite (Plagioclase-rich phaneritic intrusive rock)
igneous
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Fossilized bivalve shell
Bivalvia indeterminate; likely a fossil cockle or clam shell, aragonite/calcite replaced or preserved
fossil
Tumbled citrine or iron-stained quartz
Quartz (SiO₂), likely iron-oxide-stained or natural citrine
mineral
Quartz vein in Host Rock
Crystalline Silicon Dioxide (SiO2) in Lithic Matrix
metamorphic
Basalt
Basalt (containing plagioclase, pyroxene, and olivine)
igneous
Quartzite
Metamorphic Quartzite (predominantly SiO2)
metamorphic
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary