Quartzite River Rock
Metamorphosed Quartz-rich Sandstone (SiO2)
metamorphic
Category
Mineralogical Specimen
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Sandstone (Stream Pebble)
Arenite (primarily SiO2)
sedimentary
Diorite (River Pebble)
Diorite
igneous
Green Calcite (Onyx Marble)
Calcium Carbonate (CaCO3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Chert (Flint variety)
Chert (SiO2)
sedimentary
Basalt Pebble
Basalt
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (lithic)
Lithic Wacke / Arenite
sedimentary
Man-made Slag (Industrial Byproduct)
Anthropogenic Glassy Residue
not a natural rock
Granite Pebble (River Rock)
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Sandstone (Ferruginous)
Arenite (with iron oxide cement, Fe2O3)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
White Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Glacial Cobble (likely Granitic or Gneissic)
Granite/Gneiss Glacial Erratic
igneous
Yellow Quartzite (River Pebble)
Quartzite (primarily SiO2)
metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Chert (Jasper/Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite (clastic/metamorphic subtype)
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Amber (Dark/Black Variety)
Succinite (Resinite), C10H16O
mineral
Sandstone (Iron-stained)
Clastic sedimentary rock (SiO2 with Fe2O3 staining)
sedimentary
Granite Pegmatite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Basalt River Pebble
Basalt (Mafic Volcanic Rock)
igneous
Yellow Chert (River Stone/Pebble)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Basalt River Pebble
Extrusive Mafic Basalt
igneous
Quartzite
Quartzite (mainly SiO2)
metamorphic
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Fossilized Dinosaur Skull (Tyrannosaurus rex)
Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica
sedimentary
Green Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper variety)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Gray Slate River Stone
Slate
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert (Jasper/River Stone)
Silicon dioxide (SiO2) - Microcrystalline quartz
sedimentary
Chert (River Siltstone/Quartzite)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Smooth River Pebble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary