Likely pyrite-bearing rock
Pyrite (FeS₂), possibly disseminated in a host rock
mineral
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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Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)
Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.
Metamorphic, Mineral (within a rock type)
Sandstone
Sedimentary Clastic Rock
sedimentary
Sandstone
Sedimentary quartz arenite
sedimentary
Gemstone Beads
Various mineral species
gemstone
Conglomerate (River Rock)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Sedimentary Clastic Rock
sedimentary
Unidentified orange-brown rock fragment
Likely weathered iron-rich volcanic rock or ochre-bearing material; exact identification is impossible from the blurred image
igneous
Gneiss
Gneiss
metamorphic
Red Sandstone
Arenite (with Iron Oxide cement)
sedimentary
Fossilized Sand Dollar
Echinoidea (Clypeasteroida)
fossil
Pebble
Lithified rock fragment
sedimentary
Shale
Shale (Sedimentary rock composed of mud/clay minerals)
sedimentary
Rough Diamond
Carbon (C)
gemstone
Red Sandstone (Iron-Rich)
Arenite (Fe2O3)
sedimentary
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Sandstone
Clastic Sedimentary Rock
sedimentary
Mica-rich schist (probable)
Mica schist, likely muscovite–chlorite schist; exact minerals cannot be confirmed from the image
metamorphic
Dark volcanic rock (likely basalt)
Basalt, a fine-grained mafic volcanic rock; visual identification is tentative
igneous
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Polished agate cabochon or carved chalcedony
Microcrystalline quartz (SiO₂), likely brown/orange chalcedony or agate
gemstone
Quartz-rich rock, possibly milky quartz
Quartz (SiO₂); the photo may show a quartz-rich rock, but its texture is not clear enough to determine a specific rock name.
mineral
Sandstone
Arenite
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Clastic sedimentary rock
sedimentary
Sandstone
Sedimentary Arenite
sedimentary
Argillite / Mudstone
Argillaceous sedimentary rock
sedimentary
Raw Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz Vein Rock with Feldspar
Silicon Dioxide (SiO2) with Potassium Feldspar
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Granite
Phaneritic plutonic rock (composed of quartz, feldspar, and mica)
igneous
Banded Gneiss
Gneiss (Metamorphic rock composed of feldspar, quartz, and mica)
metamorphic
Gneiss (specifically Granitic Gneiss)
Gneiss (composed primarily of Quartz, Feldspar, and Biotite/Amphibole)
metamorphic
Vesicular basalt (likely weathered lava rock)
Basalt; fine-grained mafic volcanic rock composed chiefly of plagioclase, pyroxene, and commonly olivine
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Bauxite
Bauxite (Al2O3·2H2O)
sedimentary
Limonite
FeO(OH)·nH2O
mineral
Bivalve Shell (Fossil or Contemporary)
Class Bivalvie (various genera and species of clams, cockles, etc.)
Sedimentary (Biogenic sediment or biological remain)