Sandstone
Arenite (primarily SiO2)
sedimentary
Category
Sedimentary Rock (Possibly Composed Of Various Minerals)
Browse sedimentary rock (possibly composed of various minerals) specimens identified by the Rock Identifier community.
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Dark gray-green river stone, likely basalt or metabasalt
Basalt (fine-grained mafic volcanic rock), possibly weakly metamorphosed to metabasalt
igneous
Ferruginous Sandstone
Sandstone, Iron-rich
sedimentary
Bauxite
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Bauxite
Bauxite (Al2O3·nH2O)
sedimentary
Granite
Granite (composed mainly of quartz, alkali feldspar, and plagioclase)
igneous
Concretion (likely ironstone or carbonate)
Sedimentary concretion; exact mineral composition cannot be determined from the image
sedimentary
Bauxite
Bauxite (Al(OH)3, AlO(OH), AlOOH)
sedimentary
Bivalve Fossil (Fossilized Shell)
Class Bivalvia (fossilized in Calcium Carbonate/Aragonite)
fossil
Dalmatian Stone
Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)
igneous
Bumblebee Jasper
Carbonate-rich volcanic rock containing Sulfur and Arsenic (Realgar/Orpiment)
sedimentary
Ferruginous Sandstone
Arenite with iron oxide cement (predominantly SiO2 with Fe2O3)
sedimentary
Red Sandstone
Arenite (primarily Quartz with Iron Oxide coating)
sedimentary
Gneiss Pebble
Gneiss
metamorphic
Sandstone
Sandstone (Clastic Sedimentary Rock)
Sedimentary Rock
Pink Granite
Phaneritic Felsic Igneous Rock
igneous
Celestine (Celestite)
Strontium Sulfate (SrSO4)
mineral
Basalt
Basalt
Igneous
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Arenite with Iron Oxide (Hematite) cement
sedimentary
Laterite
Laterite (no specific mineral formula as it's a rock type)
Sedimentary
Coarse-grained granite (possibly granodiorite)
Granite, composed chiefly of quartz, feldspar, and mica; exact mineral proportions cannot be confirmed from the photograph.
igneous
Ironstone (with possible Hematite/Limonite coating)
Ironstone (Fe-rich sedimentary rock)
sedimentary
Weathered granitic rock fragment
Granite, likely quartz–feldspar–biotite aggregate
igneous
Garnet-bearing Schist / Conglomerate Specimen
Metamorphic rock with almandine garnet porphyroblasts
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg, Fe)3Si2O5(OH)4)
metamorphic
Limonite
FeO(OH)•nH2O
mineral
Tumbled dark gray stone, likely basalt or fine-grained volcanic rock
Basalt (tentative); composed mainly of plagioclase feldspar, pyroxene, and possibly olivine
igneous
Dalmation Stone
Peralkaline Rock (SiO2 with Arfvedsonite)
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Mixed Rock Collection (Pebbles and Stones)
Various geological specimens
igneous, sedimentary, and metamorphic
Quartz-rich sandstone (possibly quartzite)
Quartz arenite; if recrystallized, quartzite, composed predominantly of SiO₂
sedimentary
Tumbled granite pebble
Granite, a quartz–feldspar plutonic rock
igneous
Fossilized Shark Tooth
Elasmobranchii (various species, possibly Carcharias or Odontaspis)
fossil
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Limonite Geode (Ironstone Concretion)
FeO(OH)·nH2O (Hydrated Iron Oxide)
sedimentary
Sandstone
Sedimentary Clastic Rock
sedimentary
Dalmatian Stone
Dalmatian Jasper (Aplitic Rock)
igneous
Fossil shell fragment
Likely a marine mollusk shell, composed mainly of calcium carbonate (aragonite and/or calcite); exact species is not identifiable from the image.
fossil
Fine-grained, foliated rock (possibly slate or phyllite)
Undetermined; likely slate or phyllite, composed mainly of quartz, mica, and chlorite
metamorphic
Shale or Argillite
Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)
Sedimentary or Metamorphic (low grade)
Dalmatian Jasper
Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite
igneous