Quartz
Silicon Dioxide (SiO2)
mineral
Category
Not A Rock (Man Made Polymer)
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Quartz
Silicon Dioxide (SiO2)
mineral
Purple Chalcedony
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Tumbled Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Clear Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Fossil Bivalve Shell
Class Bivalvia (e.g., Veneriidae family)
sedimentary
Pyrite in Matrix
Iron Disulfide (FeS2)
mineral
Granite (with Quartz fragment)
Intrusive Felsic Igneous Rock
igneous
Quartzite
Metamorphic rock (SiO2)
metamorphic
Granite
Plutonic Igneous Rock
igneous
Basalt Pebble
Extrusive Igneous Rock
igneous
Basalt Fragment
Extrusive Igneous Rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Peridotite
Peridotite (Ultramafic Rock)
igneous
Likely dark green-gray metamorphic pebble
Indeterminate; possibly chlorite schist, serpentinite, or amphibolite
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Sodalite
Na8Al6Si6O24(Cl,OH)2
mineral
Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Pink Granite / K-Feldspar
Alkali feldspar granite / Potassium feldspar (Microcline/Orthoclase)
igneous
River Stone (likely Quartzite or Limestone)
Silicon dioxide (SiO2) or Calcium carbonate (CaCO3)
metamorphic
Granite
Granite (composed of Quartz, Felspar, and Mica)
igneous
Drupa or Druzy Quartz on Geode Fragment
Crystalline Silicon Dioxide (SiO2)
mineral
Manganese Oxide Crust on Limestone
Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3
sedimentary
Moss-covered Rock Fragment
Weathered Rock Fragment with Epilithic Growth
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
gemstone
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (SiO2 primary)
sedimentary
Porphyry
Porphyritic Igneous Rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Quartz Veined Siltstone
Siltstone with Quartz Intrusion (SiO2)
sedimentary
Breciated Limestone with Calcite Veins
Sedimentary Breccia (CaCO3)
sedimentary
Quartzite with Quartz Veins
Metamorphic Quartz-rich Rock (SiO2)
metamorphic
Heart-shaped Quartz
Silicon Dioxide (SiO2)
mineral
Basalt
Extrusive Igneous Rock
igneous