Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Category
Sedimentary Or Metamorphic (Base Substrate)
Browse sedimentary or metamorphic (base substrate) specimens identified by the Rock Identifier community.
Learn about Sedimentary Or Metamorphic (Base Substrate) in the encyclopedia
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Glauconite (Sandstone or Shale)
Glauconite (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
sedimentary
Limestone (River Stone)
Calcite-rich Sedimentary Rock (CaCO3)
sedimentary
Citrine (likely Heat-Treated Amethyst)
Silicon Dioxide (SiO2)
mineral
Opal
Hydrated amorphous form of silica (SiO2·nH2O)
mineral
Gneiss
Metamorphic Gneiss
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite in Matrix (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Quartz (Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz Crystal Rock
Silicon Dioxide (SiO2)
mineral
Yellow Calcite
Calcium Carbonate, CaCO3
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Faceted)
SiO2 - Silicon Dioxide
gemstone
Faceted Clear Quartz or Diamond Simulant
Silicon Dioxide (SiO2) if Quartz or Cubic Zirconia (ZrO2) if Synthetic
gemstone
Galena
Lead(II) sulfide (PbS)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Quartz with Mica (Schist/Pegmatite fragment)
Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)
igneous/metamorphic
Chert / Flint
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Quartz-veined Siltstone/Greywacke
Clastic Sedimentary Rock with Quartz Infill (SiO2 vein)
sedimentary
Poppy Jasper
Jasper (variety of Chalcedony), SiO2 (Silicon Dioxide)
sedimentary
Quartz Vein in Sandstone
Hydrothermal Quartz (SiO2) in Arenite
sedimentary
Fossil Coral (Honeycomb Coral)
Favosites (extinct genus of Tabulate coral)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Jasper with Quartz Veining
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Sandstone (likely Arkosic or Quartzose)
Arenite (SiO2 based with mineral inclusions)
sedimentary
Sandstone (likely Arkosic or Lithic Sandstone)
Arenite (SiO2 based with mineral inclusions)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Magnetite / Ironstone
Magnetite (Fe3O4)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Conglomerate
Conglomerate (Detrital sedimentary rock)
sedimentary
Jasper (specifically Green Jasper/Chert)
Jasper (Silicon Dioxide, SiO2)
sedimentary
Wishing Stone (Graywacke with Quartz Vein)
Graywacke Sandstone containing a Quartz (SiO2) intrusion
sedimentary
Dendritic Agate (also known as Dendritic Siltstone or Mudstone)
Silicon Dioxide with Manganese/Iron Oxide inclusions (SiO2 + MnO2)
sedimentary
Ferruginous Sandstone (Ironstone Nodules)
Ferruginous Sandstone with Limonite/Goethite coating (Fe2O3·H2O)
sedimentary
Chert
Chert (Microcrystalline Silica, SiO2)
sedimentary
Tumbled orbicular jasper
Orbicular jasper; microcrystalline quartz (SiO₂) with iron oxides and feldspathic/chalcedony inclusions
sedimentary
Banded Calcite (often sold as Onyx Marble)
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Quartzite
SiO2 (Crystalline Quartz)
metamorphic
Granite
Granite
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary