Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Category
Man Made Composite (Lithified Equivalent Of Sedimentary)
Browse man made composite (lithified equivalent of sedimentary) specimens identified by the Rock Identifier community.
Diamond (Cluster Ring)
Carbon (C)
mineral
Diamond in Kimberlite
Diamond (C in Kimberlite Matrix)
igneous
Rough Diamond
Diamond (pure Carbon, C)
mineral
Diamond
Carbon (C)
mineral
Quartz
Quartz (SiO₂ - Silicon Dioxide)
mineral
Pearl
Calcium Carbonate (mostly Aragonite), CaCO3 (with conchiolin)
mineral
Granite (Pegmatitic)
Phaneritic Felsic Igneous Rock
igneous
Scoria
Scoria (a vesicular basalt or andesite)
igneous
Sandstone
Arenite (primarily SiO2 - Silicon Dioxide)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (SiO2 + Fe2O3)
sedimentary
Chalcedony Geode
Chalcedony (SiO2) within a geode structure
Mineral Geode/Sedimentary or Volcanic related
Pyrite
Pyrite (Iron Disulfide), FeS2
Mineral
Red Sandstone (Iron-rich)
Ferruginous Sandstone (variable formula, primarily SiO2 + Fe2O3)
sedimentary
Quartz
Silicon Dioxide (SiO₂)
Mineral
Pearl (with Peridot)
Calcium carbonate (CaCO3) + Conchiolin; Peridot: Magnesium iron silicate (Mg, Fe)2SiO4
mineral
Rough Diamond
Diamond (pure Carbon, C)
mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Milky Quartz
Quartz (SiO2)
Mineral
Quartz (Rock Crystal)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Oolitic Limestone
Oolite (Sedimentary rock composed of CaCO3)
sedimentary
Diamond (in jewelry setting)
Carbon (C)
mineral
Pearl
Aragonite (CaCO3) with Conchiolin
mineral
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Banded Gneiss
Gneiss (variable mineral composition)
metamorphic
Quartz
Quartz (SiO₂)
Mineral
Quartz (likely macrocrystalline variety)
Quartz (SiO₂)
Mineral
Sandstone
Sandstone (Clastic Sedimentary Rock)
Sedimentary Rock
Dalmatian Stone (commonly Dyed)
Dalmatian Jasper (Peralkaline igneous rock)
igneous
Iron Ore / Ironstone Concretion
Mixture of iron oxide/hydroxide minerals, likely some combination of Hematite (Fe2O3), Goethite (α-FeOOH), and Limonite (a general term for hydrated iron oxides of variable composition) or potentially Bauxite (a mixture of aluminum hydroxides, often with iron oxides, (Al(OH)3) and FeO(OH)). The visual characteristics strongly suggest iron-rich material.
Mineral, specifically an iron ore
Quartz Geode/Druzy Quartz
Quartz (SiO₂)
Mineral
Banded Jasper (possibly "Picture Jasper")
Jasper (a microcrystalline variety of Quartz / Silicon Dioxide - SiO2)
Sedimentary rock (specifically a chemical sedimentary rock, or a chert if considered purely mineral aggregate)
Quartzite
Quartzite (SiO2)
metamorphic
Feldspar-rich Pegmatite
Granitic Pegmatite (principally KAlSi3O8)
igneous
Granodiorite with Quartz Veining
Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins
igneous
Diamond (in jewelry setting)
Adamantine Carbon (C)
mineral
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Sandstone (Ferruginous)
Arenite (Fe-oxide cemented)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Quartz (likely a macrocrystalline variety like milky quartz or smoky quartz, given the appearance in the image)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Shale
Shale (Consolidated fine-grained clay/silt)
sedimentary