Quartz Geode
Silicon Dioxide (SiO2)
mineral
Category
Mineraloid Like Synthetic Material
Browse mineraloid like synthetic material specimens identified by the Rock Identifier community.
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Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) - Limestone
sedimentary
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Chalcedony Agate / Carnelian nodules in Matrix
SiO2 (Silicon Dioxide) with iron oxide inclusions
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Granite
Phaneritic plutonic igneous rock
igneous
Blue Lace Agate
Banded Chalcedony (SiO2)
mineral
Quartz (Small fragments)
Silicon Dioxide (SiO2)
mineral
Rough Emerald
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
gemstone
Chert (Jasper-bearing)
Microcrystalline silica (SiO2) with iron oxide inclusions
sedimentary
Banded Siltstone
Siltstone with planar bedding
sedimentary
Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Laterite (Red Clay)
Laterite (Fe2O3 · nH2O and Al2O3 · nH2O)
sedimentary
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
mineral
Petrified Wood
Silicified Wood (primarily Quartz / Chalcedony: SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (or Carnelian Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Arrowhead Artifact)
Chert (SiO2)
sedimentary
Porphyry (Basaltic / Andesitic Porphyry)
Porphyritic Basalt / Porphyritic Andesite
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Sandstone (Ferruginous)
Arenite (Fe-bearing Clastic Sedimentary Rock)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe2O3 rich)
sedimentary
Chert (often called Flint or River Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Banded Iron Formation (BIF) / Ferruginous Quartzite
Banded Iron Formation containing Hematite/Goethite and Chert/Quartz
sedimentary
Amber
Succinite (organic gemstone, approx. C10H16O)
fossil
Granite
Phaneritic plutonic igneous rock (typically 20% to 60% quartz by volume)
igneous
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Pumice
Vesicular volcanic glass (primarily SiO2)
igneous
Chert (Arrowhead Artifact)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone with Iron Staining
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Chert (often called Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Iron Slag (Industrial Byproduct)
Anthropogenic Vitrification Product/Ferrous Slag
Mineral-like Industrial Smelting Waste
Gneiss
Gneiss
metamorphic
Banded Calcite (often sold as 'Ocean Jasper' or 'Caribbean Calcite' variant)
Calcium Carbonate (CaCO3) with potential Aragonite inclusions
Sedimentary
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Fossiliferous Limestone with Fossil Fragment
Fossiliferous Limestone (CaCO3 with organic remains)
fossil