Quartz with Iron Oxide
SiO2
mineral
Category
Industrial Byproduct (Anthropogenic Rock)
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Satin Spar (often sold as Selenite)
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Diamond
Carbon (C)
gemstone
Diamond
Carbon (C)
mineral
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Diamond
C
gemstone
Rough Sapphire (possibly Yellow/Green Corundum)
Corundum (Al2O3)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Diamond
Natural Diamond (Carbon, C)
gemstone
Diamond (or Cubic Zirconia simulant)
Carbon (C) or Zirconium Dioxide (ZrO2)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Peridot (Olivine)
Olivine ((Mg, Fe)2SiO4)
mineral
Diamond
Carbon (C)
gemstone
Quartzite pebble
Quartzite (SiO2)
metamorphic
Magnetite / Ironstone Pebble
Magnetite (Fe3O4)
mineral
Peridotite (Dunite)
Olivine-rich Peridotite ((Mg,Fe)2SiO4)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Tumbled Agate and Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
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
Greenschist
Chlorite schist
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Rhodolite Garnet
Mg3Al2(SiO4)3 - Fe3Al2(SiO4)3 (Pyrope-Almandine series)
mineral
Coal (Anthracite or Bituminous)
Lithified plant matter (Carbon)
sedimentary
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Ruby, Emerald, and Sapphire (Corundum and Beryl)
Corundum (Al2O3) and Beryl (Be3Al2Si6O18)
mineral
Pink Orthoclase Feldspar with Dendrites
Orthoclase (KAlSi3O8) with Manganese Oxide dendrites
mineral
Chert (Jasper/Flint variant)
Silicon Dioxide (SiO2)
sedimentary
Chalcedony Geode Fragment
Silicon Dioxide (SiO2)
mineral
Flesh-colored Quartzite
Quartzite (SiO2)
metamorphic
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
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
White Quartz (Carved or Tumbled)
Silicon Dioxide (SiO2)
mineral