Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Category
Mineral (Silicate Replaced Organic Material)
Browse mineral (silicate replaced organic material) specimens identified by the Rock Identifier community.
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Cullet (Slag Glass)
Amorphous Silica (Industrial byproduct)
mineraloid
Chert (often called Flint in this context)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclasts
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Lavender Jade (Jadeite)
Jadeite - Sodium Aluminum Silicate (NaAlSi2O6)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Sandstone Chert/Quartzite
Silicon Dioxide (SiO2) - Sedimentary Sandstone / Orthoquartzite
sedimentary
Rhodonite
Rhodonite (Manganese Silicate), (Mn,Fe,Mg,Ca)SiO3
mineral
Blue Topaz (facetted in jewelry)
Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)
mineral
Mixed Polished Gemstones (Tumbled Stones)
Mixed Silicates and Oxides (SiO2, KAlSi3O8, Ca2Al2Be3Si6O22, etc.)
mineral
Travertine
Terrestrial Sedimentary Limestone (CaCO3)
sedimentary
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Chert Nodule
Chert (SiO2)
sedimentary
Chert (Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Travertine (Tufa)
Chemical Limestone (CaCO3)
sedimentary
Mica Schist
Mica Schist (Complex Silicate Rock)
metamorphic
Bituminous Coal (with Anthracite or Vitrinite inclusion)
Organic-rich Sedimentary Rock (Carboniferous classification)
sedimentary
Geode with Quartz Crystal Cavity
Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix
sedimentary
Limonite Concretion
Limonite (FeO(OH)·nH2O) Pseudomorph
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Fossilized Echinoid (Sea Urchin)
Echinoidea (Class) - Often found as Micraster or Clypeaster specimens
sedimentary
Sandstone (Ferruginous)
Clastic Sedimentary Rock (SiO2 with Fe2O3)
sedimentary
Sodalite
Sodalite (Sodium Aluminum Silicate Chloride) - Na8(Al6Si6O24)Cl2
mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 cement)
sedimentary
Jasper (Brown Iron-Rich Variety)
Silicon Dioxide (SiO2) with Fe2O3 (Iron Oxide/Crystalline Quartz)
sedimentary
Sandstone
Arenite (primarily composed of SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Diorite (Polished River Stone)
Intrusive Igneous Diorite
igneous
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Coarse Sand or Fine Gravel
Detrital Sedimentary Fragments (mostly SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert / River Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert (varieties including Flint or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz with Muscovite Mica
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate Hydroxide Fluoride (KAl2(AlSi3O10)(F,OH)2)
mineral
Chert (Jasper)
Silicon dioxide (SiO2)
sedimentary
Pearl (with Peridot)
Calcium carbonate (CaCO3) + Conchiolin; Peridot: Magnesium iron silicate (Mg, Fe)2SiO4
mineral
Green Quartzite
Quartzite (SiO2 with chromium-rich impurities)
metamorphic
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Slag (Industrial Glass Slag)
Amorphous Silicate Glass (often containing Al, Ca, Mg, and Ti oxides)
Mineraloid (Industrial byproduct)
Iolite (Cordierite)
Magnesium Iron Aluminum Silicate (Mg,Fe)2Al4Si5O18
mineral
Olivine (Peridotite)
Magnesium Iron Silicate - (Mg, Fe)2SiO4
igneous