Quartz (variety of colors)
SiO2 (Silicon Dioxide)
Mineral
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
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Olivine (Peridot when gem-quality)
Olivine Group (Magnesium Iron Silicate, (Mg,Fe)2SiO4)
mineral
Sandstone with Quartz Sphere
Arenite (SiO2-rich sedimentary rock) with Quartzite/Rose Quartz sphere
sedimentary
Almandine Garnet
Almandine (Fe3Al2Si3O12)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Clear Quartz (Herkimer Diamond variant)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Agate (Slab)
Agate (Cryptocrystalline variety of Quartz, SiO2)
Mineral
Honey Calcite
Calcite (Calcium Carbonate - CaCO3)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
mineral
Blue Agate (Tumbled and Dyed)
Silicon Dioxide (SiO2) with likely organic dyes
mineral
Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate and Carnelian varieties)
Silicon Dioxide (SiO2)
mineral
Black Tourmaline (Schorl)
Schorl (Sodium iron silicate hydroxide boron silicate); NaFe3Al6(BO3)3Si6O18(OH)4
mineral
Quartzite (Rounded Pebble)
Quartzite (predominantly SiO2)
metamorphic
Weathered dark flint (chert) pebble
Microcrystalline quartz (SiO₂), commonly called flint or chert
sedimentary
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
sedimentary
Chert / Chalcedony Nodules
Microcrystalline Quartz (SiO2)
sedimentary
Bumble Bee Jasper
Calcite-bearing Volcanic Tuff (not a true Jasper)
sedimentary
Red Jasper
Jasper (SiO2) with Hematite (Fe2O3) inclusions
sedimentary
Jasper
Silicon dioxide (SiO2) with iron oxide and clay inclusions
sedimentary
Slag (Industrial Glass/Metal Waste)
Artificial silicate/ferro-silicate byproduct
Mineraloid (Industrial byproduct)
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Geode (Unopened)
Chalcedony/Quartz Geode (SiO2)
sedimentary
Blue Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Quartzite (clastic/metamorphic subtype)
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Garnet-Mica Schist
Schist (variety with Almandine Garnet, Fe3Al2(SiO4)3)
metamorphic
Sandstone
Arenite (Sedimentary Rock)
sedimentary
Pyrite
Pyrite (FeS₂)
Mineral
Geode (Unopened)
Silicon Dioxide (SiO2) in sedimentary host rock
sedimentary
Tumbled honey calcite (likely aragonite/calcite material)
Calcite, CaCO₃; possibly aragonite, a polymorph of CaCO₃
mineral
Quartz (Water-worn Pebble)
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Pumice
Pumice (a highly vesicular volcanic glass)
igneous