Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
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Basalt
Basalt
igneous
Porphyritic Basalt with Quartz Inclusions
Aphanitic Porphyritic Basalt
Igneous
Chert (Jasper variation)
Silicon Dioxide (SiO2)
sedimentary
Basalt with Vesicular Surface
Basalt (Mafic Extrusive)
igneous
Granodiorite Pebble
Granodiorite (containing Quartz, Plagioclase Feldspar, and Biotite/Amphibole)
igneous
Andesite
Andesite
igneous
Basalt with Quartz/Calcite Inclusions
Mafic Volcanic Rock (Fe-Mg silicate rich)
igneous
Basalt Pebble
Extrusive mafic igneous rock; primarily (Ca, Na)(Mg, Fe, Al)Si2O6 and (Ca, Na)AlSi3O8
igneous
Basalt
Mafic Volcanic Rock (composed of plagioclase, pyroxene, and olivine)
igneous
Basalt (Road Gravel)
Aphanitic mafic volcanic rock (various compositions of plagioclase feldspar and pyroxene)
igneous
Basalt
Basalt
igneous
Limestone with Calcite Veins
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Basalt (Weathered/River worn)
Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)
igneous
Banded Agate (specifically Lake Superior Agate)
Silicon dioxide (SiO2) - Cryptocrystalline Chalcedony
mineral
Basalt (Crushed Roadstone)
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt
igneous
Unakite
Unakite (Epidotized Granite)
metamorphic
Basalt (Polished River Stone)
Mafic Volcanic Rock (primarily Plagioclase and Pyroxene)
Igneous
Basalt River Pebble
Basalt
igneous
Serpentine
Serpentinite (Mg, Fe, Ni)3Si2O5(OH)4
metamorphic
Vesicular Basalt
Extrusive mafic igneous rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Basalt River Stone
Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-feldspar, Quartz, and Biotite)
igneous
Serpentine
Antigorite-Lizardite-Chrysotile (Mg3Si2O5(OH)4)
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Basalt
Mafic Igneous Rock (composed primarily of plagioclase feldspar and pyroxene)
igneous
Unakite (Tumbled)
Epidotized Granite
metamorphic
Andesite River Stones
Andesite
igneous
Basalt
Basalt (predominantly Plagioclase Feldspar and Pyroxene)
igneous
Basalt (Gravel Pebble)
Basalt (contains pyroxene, plagioclase feldspar, and olivine)
igneous
Basalt
Basalt
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Basalt
Mafic Igneous Pebble
igneous
Bauxite (Laterite)
Hydrated aluminum oxides (Al2O3·nH2O)
sedimentary
Basalt with Plagioclase Phenocrysts
Porphyritic Basalt
igneous
Vesicular Basalt with Mineral Inclusions
Vesicular Basalt
igneous
Granite Tile (Commercial Granite)
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous
Limonitic Quartzite
Metamorphosed sandstone with Limonite (FeO(OH)·nH2O) staining
metamorphic
Basalt (River Stone)
Basalt
igneous
Pink Granite
Granite (Phaneritic intrusive igneous rock dominated by Quartz and K-Feldspar)
igneous