Asphalt Chunk (with aggregate)
Bituminous concrete / Anthropogenic conglomerate
sedimentary (anthropogenic/man-made conglomerate)
Category
Not A Rock
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Granite or Granitic Gneiss River Rock
Granite
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase
igneous
Granite
Felsic intrusive igneous rock
igneous
Limestone
Calcium carbonate (CaCO3)
sedimentary
Quartzite
Metamorphic Quartz Arenite
metamorphic
Quartz (or Chert/Flint)
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Granite
Granite (Intrusive Igneous Rock)
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Flint / Chert (or fossiliferous nodule)
Microcrystalline quartz (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Granite or Porphyritic Igneous Rock (weathered)
Granitoid
Igneous
Chert with Quartz Veining
Microcrystalline Silica (SiO2)
sedimentary
Unidentified Rock Fragment
Unknown
Rock
Vesicular Basalt (Scoria)
Basalt with vesicular texture
igneous
Granite
Granite
igneous
Basalt
Extrusive igneous rock
igneous
Basalt with inclusion
Basalt (Aphanitic-Porphyritic texture)
igneous
Basalt with Scoria
Amygdaloidal Basalt / Vesicular Basalt
igneous
Druzy Quartz on Chert/Chalcedony
Silicon Dioxide (SiO2)
mineral
Likely quartz-rich granite or granitic pegmatite
Granite, composed chiefly of quartz (SiO₂), feldspar, and mica; identification from the image is approximate
igneous
Weathered granitic cobble
Granitoid, likely granite or granodiorite
igneous
Weathered granite or granitic gneiss
Granite; predominantly quartz, feldspar, and mica (exact identification is uncertain from the image)
igneous
Granite-like igneous rock
Likely medium-grained granite or granodiorite; quartz–feldspar–mica aggregate
igneous
Basalt (River Rock)
Basalt
igneous
Quartz Geode
Quartz (Silicon Dioxide, SiO2)
mineral
Granite
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous
Iron-rich breccia or weathered ironstone
Goethite–hematite-bearing limonite, possibly with quartz and altered rock fragments
igneous
Small rounded pebble, likely quartz-rich river or beach stone
Unidentified lithic pebble; exact rock type cannot be determined from the image
sedimentary
Crushed Granite and Basalt
Phaneritic Igneous Rock / Aphanitic Igneous Rock
igneous
Small pale stone, likely quartzite or limestone fragment
Indeterminate; possible quartzite (mostly SiO₂) or calcitic limestone (CaCO₃)
metamorphic or sedimentary
Gravel or Crushed Stone
Fragmented Aggregate Stone
sedimentary or igneous fragment