Yellow Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Category
Industrial Byproduct
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Botryoidal Chalcedony
Silicon Dioxide (SiO2)
Mineral
Chert (Flint)
Silicon dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limonite / Ironstone
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral / Sedimentary
Parti Sapphire
Corundum (Al2O3)
mineral
Aquamarine (Pale variety)
Beryl (Be3Al2Si6O18)
mineral
Smoky Quartz and Biotite Schist
Quartz-Biotite Schist (SiO2 + K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Milky Quartz (Crystal Cluster)
Silicon Dioxide (SiO2) - Quartz Variety
mineral
Agate
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Dendritic Inclusions
Silicon Dioxide (SiO2)
mineral
Schist
Mica Schist
metamorphic
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)
mineral
Peridot (Olivine)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Peridot
Olivine ((Mg, Fe)2SiO4)
mineral
Quartz (Variety: Citrine or Tumbled Chalcedony)
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chalcedony (specifically Agate or Common Opal variety)
Cryptocrystalline Silica (SiO2)
mineral
Chert (specifically Flint or Novaculite variant)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Rough Diamond
Native Carbon (C)
mineral
Chert (specifically Red Chert or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Quartzite with Sandstone/Iron staining
Metamorphic Quartzite (SiO2)
metamorphic
Aragonite Star Cluster
Aragonite (Sputnik habit) - CaesarCO3
mineral
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Pegmatite
Granitic Pegmatite
igneous
Serpentinite
Serpentine rock (Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4
metamorphic
Citrine (Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (Beach Pebble)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate/Chert variety)
Silicon Dioxide (SiO₂)
mineral
Chert (Chalcedony/Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Cubic Zirconia (CZ)
Cubic Zirconium Dioxide (ZrO2)
mineral (synthetic)
Granitic Pegmatite with Biotite
Pegmatitic Granite (contains KAlSi3O8, SiO2, K(Mg,Fe)3AlSi3O10(OH)2)
igneous
Garnet Schist
Garnetiferous Micaceous Schist
metamorphic
Schist
Mica Schist
metamorphic