Basalt
Mafic extrusive igneous rock
igneous
Category
Not A Rock
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Asphalt (Bituminous Concrete)
Bituminous mix containing aggregates and petroleum-based binder (CnH2n+2)
not a rock (anthropogenic material/technofossil)
Schist
Mica Schist (primarily consisting of muscovite KAl2(AlSi3O10)(OH)2 or biotite K(Mg,Fe)3(AlSi3O10)(OH)2)
metamorphic
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 inclusions)
sedimentary
Limestone Cobble
Sedimentary Limestone (Calcium Carbonate, CaCO3)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary
Basalt with Quartz/Calcite matrix
Basalt (SiO2 with Ca/Mg/Fe silicates) on a Mineral Matrix
igneous
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Sandstone (Quartzose Sandstone)
Arenite (SiO2 principal component)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Basalt River Stone with Quartz Vein
Basalt (Mafic volcanic rock)
igneous
Chalcedony (Agate/Carnelian)
Silicon Dioxide (SiO2)
mineral
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Pink Feldspar
Orthoclase Feldspar (KAlSi3O8)
mineral
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Sandstone
Arenite (primarily Quartz-rich)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Ammonite Fossil in Limestone Matrix
Ammonoidea (subclass) in Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Calcareous or Quartz-rich)
Arenite
sedimentary
Sandstone
Arenite (primarily SiO2 with various cementing agents)
sedimentary
Chert Breccia
Brecciated Chert (Sedimentary Rock)
sedimentary
Pumice
Pumice (a frothy volcanic glass)
igneous
Quartz Geode
Silicon Dioxide (SiO2) in Host Rock
sedimentary
Peridot in Basalt
Olivine ((Mg, Fe)2SiO4) in Basalt
mineral
Basalt with Quartz/Feldspar Vein
Mafic Volcanic Rock (Basalt) with SiO2 hydrothermal vein
igneous
Vesicular Basalt
Basalt (principally Plagioclase and Pyroxene)
igneous
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Basalt (River Pebble)
Extrusive mafic igneous rock
igneous
Basalt (River Stone)
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Vesicular Basalt (or Scoria)
Vesicular Basalt
igneous
Granite Water-Worn Pebble
Phaneritic Felsic Igneous Rock (Granite)
igneous
Basalt (with possible fine-grained mineralization)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Dalmation Jasper (Dalmation Stone)
Perthitic feldspar-quartz-amphibole rock
igneous
Basalt River Stone
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Sandstone (Quartzose)
Sandstone (clastic sedimentary rock, primarily SiO2)
sedimentary
Basalt (Weathered River Stone)
Basalt (Extrusive Mafic Igneous Rock)
igneous
Scoria (Lava Rock)
Scoria (extrusive volcanic rock)
igneous
Scoria (Lava Rock)
Scoria (extrusive volcanic rock)
igneous
Diorite (River Rock)
Intermediate plutonic igneous rock
igneous
Scoria (Lava Rock)
Scoria (Mafic volcanic rock)
igneous
River-worn Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous