Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
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Garnet Schist
Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist
metamorphic
Chert (Nodule)
Silicon dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Quartzite Pebble
Metamorphosed Quartz-rich Sandstone (SiO2)
metamorphic
Hematite
Hematite (Fe2O3)
mineral
Chert (variously Flint)
Chert (Microcrystalline or cryptocrystalline Quartz, SiO₂)
sedimentary
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized oyster or bivalve shell
Fossil Gryphaeidae or Ostreoidea; calcitic shell, CaCO₃
fossil
Sandstone (Greywacke)
Arenite / Wacke (SiO2 + varied clasts)
sedimentary
Red Jasper (Quartz)
Silicon Dioxide (SiO2) with Iron impurities
sedimentary
Chert (Flint Nodule)
Microcrystalline or cryptocrystalline quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Garnet-Bearing Gneiss
Garnetiferous Feldspathic Gneiss
metamorphic
Iron Slag
Iron/Steel Slag (Ferrosilicate Glass)
industrial byproduct (anthropogenic material)
Graphite
Graphite (Native Carbon, C)
metamorphic
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Synthetic Resin Charm (Seal Shape)
Polymer Resin with plastic glitter / Polyethylene terephthalate glitters
Synthetic material (Not a rock or mineral)
Opalite
Man-made opalescent glass (SiO2 + metal oxides)
mineral (synthetic)
Orange Calcite
Calcite (CaCO3)
Mineral
Chert (Flint)
Chert (SiO2)
sedimentary
Quartz Geode (Cracked Open Fragment)
Silicon Dioxide (SiO2)
mineral
Anthracite Coal
Anthracite coal (High-rank coal)
sedimentary
Fossil shark teeth
Likely fossilized shark teeth; exact species indeterminate from the image, possibly Carcharhiniformes or related taxa
fossil
Epidote
Epidote (Ca2(Al2,Fe3+)3(SiO4)3(OH))
metamorphic
Chert (often called Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Anthracite Coal
Anthracite (Carbon)
sedimentary
Weathered vuggy quartz-rich rock (probable silicified limestone or quartz breccia)
Microcrystalline quartz (SiO₂) with calcite (CaCO₃), iron oxides, and minor clay minerals
sedimentary
Chert (Nodule)
Chert (Alpha-Quartz, SiO2)
sedimentary
Red Sandstone (Old Red Sandstone Pebble)
Arenite with iron oxide (Fe2O3) cement
sedimentary
Chert
Microcrystalline silica (SiO2)
sedimentary
Chert (varieties: Flint, Jasper)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Raw Emerald
Beryl (Be3Al2(SiO3)6) with Cr/V impurities
mineral
Garnet (Almandine variety)
Almandine, Fe3Al2(SiO4)3
Mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Orange Calcite (likely polished specimen)
Calcite
Mineral
Garnet-Mica Schist
Garnetiferous Porphyroblastic Schist
metamorphic
Schist with Biotite Inclusion
Biotite-bearing Mica Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Polished Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary