Sandstone (Weathered / Crushed)
Quartz Sandstone
sedimentary
Category
Not A Rock Or Mineral
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Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (Quartz Sandstone)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Green Quartz (Prasiolite/Adventurine)
Silicon Dioxide with inclusions (SiO2)
mineral
Sandstone
Arenite (composed mainly of SiO2)
sedimentary
Sandstone
Sandstone (Sedimentary rock composed of silicate grains)
sedimentary
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Basalt with Scoria
Amygdaloidal Basalt / Vesicular Basalt
igneous
Mudstone/Siltstone with Liesegang Bands
Argillaceous Sedimentary Rock with Chemical Banding
sedimentary
Sedimentary Pebble
Sedimentary Rock Fragment
sedimentary
Sandstone
Sedimentary Rock (Quartz Arenite)
sedimentary
Basalt with Phenocrysts
Porphyritic Basalt
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Shark Tooth Fossil
Vertebrate fossilized tooth (various genera such as Carcharodon, Otodus, or Negaprion)
fossil
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone
Sedimentary Rock (Quartz Arenite)
sedimentary
Quartz Vein in Siltstone
Siltstone with Quartz (SiO2) inclusion
sedimentary
Garnet Schist
Almandine Garnet-bearing Mica Schist
metamorphic
Garnet Schist
Almandine-Muscovite Schist
metamorphic
Pink Granite Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Granite with Mafic Xenolith
Intrusive Igneous Rock (Felsic to Intermediate)
igneous
Granite
Intrusive Igneous Rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Granite
igneous
Granite
Phaneritic Plutonic Igneous Rock (primarily composed of quartz, alkali feldspar, and plagioclase)
igneous
Sandstone
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
gemstone
Sandstone
Arenite
sedimentary
Sandstone
Arenite (SiO2 dominant)
sedimentary
Granite
Intrusive Igneous Rock (composed mainly of quartz, alkali feldspar, and plagioclase)
igneous
Sandstone
Clastic sedimentary rock
sedimentary
Pyrite on Limestone
Iron Disulfide (FeS2) in Calcium Carbonate (CaCO3) matrix
sedimentary (matrix) / mineral (inclusion)
Note regarding image quality
Indeterminate
Shale or Mudstone River Pebble
Argillaceous sedimentary rock
sedimentary
Agate (Carnelian Agate with Quartz Matrix)
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt
igneous