Sandstone
Arenite (Sandstone)
sedimentary
Category
Industrial Byproduct
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Diamond
Carbon (C)
gemstone
Schist
Schist (Crystalline metamorphic rock)
metamorphic
Quartzite pebble
Quartzite (SiO2)
metamorphic
Magnetite / Ironstone Pebble
Magnetite (Fe3O4)
mineral
Basalt Pebble
Basalt (Mafic volcanic rock)
igneous
Peridotite (Dunite)
Olivine-rich Peridotite ((Mg,Fe)2SiO4)
igneous
Quartz (Iron-Stained or Milky)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Tumbled Agate and Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Schist
Mica Schist
metamorphic
Gold-bearing Quartz Ore
Auriferous Quartz (SiO2 with Au)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Granite (Pegmatitic)
Phaneritic Felsic Igneous Rock
igneous
Basalt
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Quartzite pebble
Quartzite (SiO2)
metamorphic
Chert (Quartz Variety)
Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Clear Quartz Crystal
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Pegmatite (Granitic) with Tourmaline
Granitic Pegmatite (containing Schorl and Quartz)
igneous
Quartz Pebble (Water-worn Quartzite)
Silicon Dioxide (SiO2)
metamorphic
Greenschist
Chlorite schist
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone (Banded)
Clastic Sedimentary Rock (composed of SiO2, CaCO3, or Fe2O3 cement)
sedimentary
Sandstone (Weathered Pebble)
Arenite (SiO2 primarily)
sedimentary
Rhodolite Garnet
Mg3Al2(SiO4)3 - Fe3Al2(SiO4)3 (Pyrope-Almandine series)
mineral
Coal (Anthracite or Bituminous)
Lithified plant matter (Carbon)
sedimentary
Sandstone
Arenite (specifically Quartz Arenite)
sedimentary
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Ruby, Emerald, and Sapphire (Corundum and Beryl)
Corundum (Al2O3) and Beryl (Be3Al2Si6O18)
mineral
Coal (Bituminous)
Organic sedimentary rock primarily consisting of carbon (C)
sedimentary
Pink Orthoclase Feldspar with Dendrites
Orthoclase (KAlSi3O8) with Manganese Oxide dendrites
mineral
Chert (Jasper/Flint variant)
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chalcedony Geode Fragment
Silicon Dioxide (SiO2)
mineral
Flesh-colored Quartzite
Quartzite (SiO2)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary/mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Cubic Zirconia (as a jewelry specimen)
Zirconium dioxide (ZrO2)
mineral