Banded Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Category
Sedimentary Rock (Possibly Composed Of Various Minerals)
Browse sedimentary rock (possibly composed of various minerals) specimens identified by the Rock Identifier community.
Learn about Sedimentary Rock (Possibly Composed Of Various Minerals) in the encyclopedia
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Sandstone (Ferruginous)
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Sandstone (Weathered Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Unidentifiable Specimen
Undetermined
Unknown
Pink Granite
Granite (Phaneritic Quartz-Feldspar rock)
igneous
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Sandstone
Arenite (primarily composed of SiO2)
sedimentary
Chalcedony (Agate / Moss Agate)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite
sedimentary
Black basalt (likely polished or cut fragment)
Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase, clinopyroxene, and often olivine or magnetite
igneous
Iron sulfide-rich ore, possibly pyrite-bearing gossan
Likely pyrite (FeS₂) with iron oxides/hydroxides and host rock; exact identification requires testing
mineral
Diorite
Intermediate plutonic igneous rock
igneous
Sea Shell (Mollusk Shell)
Calcium Carbonate (Aragonite/Calcite)
fossil
Coal (Bituminous / Anthracite)
Organic Sedimentary Rock (Carbonaceous Rock)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Tumbled pale quartz/chalcedony fragment
Quartz (SiO₂), possibly microcrystalline chalcedony
mineral
Sandstone
Arenite
sedimentary
Iron-stained quartz-rich rock, possibly quartzite or hydrothermal quartz
Quartz (SiO₂), likely with iron oxides; exact host rock uncertain from the photograph
metamorphic
Sandstone (Banded)
Sedimentary Clastic Rock
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Shiva Lingam
Cryptocrystalline Quartz (Jasper/Agate)
sedimentary
Sandstone / Weathered Quartzite
Sandstone (Quartz Arenite)
sedimentary
Red Jasper (possibly Brecciated)
Jasper (Silicon Dioxide, SiO2)
sedimentary
Zebra Jasper
Silicon Dioxide (SiO2)
metamorphic
Granite
Intrusive igneous rock
igneous
Sandstone or Quartzite
Arenite (if sedimentary) / Quartzite (if metamorphic)
Sedimentary or Metamorphic
Sandstone
Sedimentary Rock (Quartz arenite or arkose)
sedimentary
Sandstone
Arenite or Sandstone
Sedimentary Rock
Granite
Granite (composed mainly of Quartz, Potassium Feldspar, Plagioclase, and Biotite/Mica)
igneous
Granite
Phaneritic intrusive igneous rock (approx. 70 percent SiO2)
igneous
Sandstone (Quartz-rich)
Arenite (composed mainly of SiO2)
sedimentary
Sandstone
Sandstone (Sedimentary rock composed of silicate grains)
sedimentary
Granite Boulder
Intrusive Igneous Rock
igneous
Chalcedony (River Stone)
Microcrystalline Quartz (SiO2)
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Red Jasper (possibly Agatized Jasper)
Jasper (Silicon Dioxide, SiO2 with Fe2O3 inclusions)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Red Sandstone Pebble
Arenite with iron oxide (Hematite)
sedimentary