Unknown Rock Fragment
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Not A Rock
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Quartz Vein in Metamorphic Rock
Quartzite or Schist host with Quartz (SiO2) intrusion
metamorphic
Granite or granitic gneiss
Quartz–feldspar–mica granitoid; possibly foliated gneiss
igneous
Weathered granite or granitic gneiss
Quartz–feldspar–mica granitoid; possibly weakly gneissic
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within metamorphic/igneous matrix
igneous/metamorphic
Basalt
Extrusive Igneous Rock
igneous
Basalt Pebble / River Stone
Basalt (Mafic Extrusive Igneous Rock)
igneous
Fossil Snail
Gastropoda fossil
fossil
Desert Rose (Baryte or Selenite variant)
Barium Sulfate (BaSO4) or Gypsum (CaSO4·2H2O) with Sand inclusions
mineral
Rock Specimen
Unclassified rock specimen
sedimentary
Granodiorite (Weathered)
Granodiorite
igneous
Fossilized Shell Impression / Siltstone Fossil
Bivalvia / Brachiopoda mold in Siltstone
fossil
Quartz (Clear/Smoky Geode fragment)
Silicon Dioxide (SiO2)
mineral
Chert with Quartz Veining
Microcrystalline Silica (SiO2)
sedimentary
Granite
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous
Quartz Geode
Quartz (Silicon Dioxide, SiO2)
mineral
Fossil Coral
Rugose Coral or Tabulate Coral (Phylum Cnidaria)
fossil
Vesicular Basalt (Scoria)
Basalt with vesicular texture
igneous
Basalt Pebble
Extrusive Igneous Rock / Basalt
igneous
Basalt
Extrusive Igneous Rock
igneous
Basalt
Aphanitic Mafic Volcanic Rock
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Crushed Granite and Basalt
Phaneritic Igneous Rock / Aphanitic Igneous Rock
igneous
Serpentine
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4
metamorphic
Granodiorite (Gneissic texture)
Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)
igneous
Basalt (Vesicular)
Basalt (Extrusive Volcanic Rock)
igneous
Basalt
Extrusive igneous rock
igneous
Granite
Granite
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
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite-like rock
Felsic intrusive igneous rock, probably granitic or granodioritic
igneous
Geode with Quartz and possibly Jasper/Hematite
Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides
Mineral/Sedimentary Geode
Small red-brown mineral or rock fragment
Unidentified; possibly iron-oxide-rich jasper, garnet, or weathered sulfide
mineral
Quartz-veined Metamorphic Pebble
Silicate-rich metamorphic rock with quartz veins (SiO2)
metamorphic
Likely basalt or vesicular volcanic rock
Basalt, possibly scoriaceous basalt; exact identification is uncertain from the photograph
igneous
Wishing Rock (Quartz Vein in Host Rock)
Silicon dioxide (SiO2) vein in various host rocks
Igneous/Sedimentary/Metamorphic with Mineral Vein
Granite / Quartzite Specimen
Granite / Quartz (SiO2 with Feldspar and Mica)
igneous
Basalt Pebble (Vesicular / Beach Cobble)
Basalt (mafic extrusive igneous rock)
igneous