Sandstone
Arenite
Sedimentary
Category
Metamorphic Rock
Browse metamorphic rock specimens identified by the Rock Identifier community.
Learn about Metamorphic Rock in the encyclopedia
View all →
Aquamarine and clear quartz
Aquamarine (Be3Al2Si6O18), Quartz (SiO2)
Mineral
Pyrite in Quartz (Drill Core)
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions
igneous/metamorphic (hydrothermal)
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Vesicular Basalt (Lava Rock)
Vesicular Basalt
igneous
Vesicular Basalt (or Scoria)
Vesicular Basalt
igneous
Basalt
Basalt
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Basalt
Basalt
igneous
Shale (Beach-worn)
Laminated Pelite (primarily clay minerals and quartz)
sedimentary
Desert Varnish on Sandstone
Ferromanganese coating on Quartz Arenite
sedimentary
Gravel or Crushed Stone
Fragmented Aggregate Stone
sedimentary or igneous fragment
River Pebble (likely Quartzite or Siltstone)
Sedimentary Clast (SiO2 based)
sedimentary
Granite
Granite
Igneous
Rhodonite
Manganese Silicate (Mn, Fe, Mg, Ca)SiO3
mineral
Quartz Geode
Silicon Dioxide (SiO2) within a sedimentary or volcanic shell
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Unknown Tumbled Stone
Unknown (Too Blurry)
mineral
Greenschist
Chlorite schist
metamorphic
Basalt with Alteration Crust
Basalt (SiO2 range 45-52%)
igneous
Leopard Skin Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
sedimentary
Basalt
Mafic Igneous Rock (composed primarily of plagioclase feldspar and pyroxene)
Igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Basalt Cobble
Aphanitic Mafic Igneous Rock (Basalt)
igneous
Basalt River Cobble
Basalt (Mafic volcanic rock)
igneous
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, Mica)
igneous
Druzy Quartz on Chert/Siltstone
Silicon Dioxide (SiO2) on Microcrystalline Silica/Siltstone matrix
sedimentary
Quartz Druzy (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Quartz (in matrix)
Quartz (SiO₂)
mineral
Almandine Garnet
Almandine (Fe3Al2Si3O12)
mineral
Orange Quartz (or Carnelian Chalcedony)
Silicon Dioxide (SiO2)
mineral
Amethyst
Quartz variety; chemical formula: SiO₂ (silicon dioxide) with Fe³⁺ impurities
Mineral
Drill Core Sample
Cylindrical Rock Core (Specific mineralogy varies by extraction site)
Metamorphic (Likely Gneiss or Schist based on texture)
Green Aventurine
Aventurine Quartz (SiO2 + Fuchsite inclusions)
mineral
Basalt
Basalt (composition predominately Plagioclase feldspar and Pyroxene)
igneous
River Rocks (Black)
Various lithologies (e.g., basalt, chert, obsidian for black varieties), mechanically rounded clasts
Sedimentary
Quartz with Iron Stains
Quartz (SiO2) with iron oxide/hydroxide staining
Mineral
Fuchsite
Chromium-rich Muscovite (KAl2(AlSi3O10)(OH,F)2 with Cr replacements)
mineral
Ruby (Corundum)
Corundum (Aluminum Oxide with Chromium), Al2O3:Cr
mineral
Banded Greywacke
Greywacke (Lithic wacke)
sedimentary
Granite
Plutonic felsic rock (Quartz, Feldspar, Mica)
igneous