Weathered sandstone
Quartz-rich sandstone (clastic sedimentary rock)
sedimentary
Category
Metamorphic Rock (Composed Of Multiple Minerals)
Browse metamorphic rock (composed of multiple minerals) specimens identified by the Rock Identifier community.
Learn about Metamorphic Rock (Composed Of Multiple Minerals) in the encyclopedia
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Ironstone / Hematite
Iron(III) oxide (Fe2O3)
mineral
Tumbled quartz-rich pebble
Microcrystalline quartz (SiO₂), possibly milky quartz or chalcedony
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Porrphyritic pink granite (weathered)
Granite, commonly composed of quartz, alkali feldspar, plagioclase, and biotite/hornblende
igneous
Botryoidal Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Quartz vein in host rock
Milky quartz (SiO₂) with likely metamorphic country rock, possibly gneiss or schist
metamorphic
Quartzite
Quartzite (composed primarily of Silicon Dioxide, SiO2)
metamorphic
Amber (fossilized tree resin)
Succinite; organic resin composed mainly of polymerized terpenoids
fossil
Granite
Intrusive igneous rock
igneous
Serpentine Sphere
Serpentinite
metamorphic
Shale
Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)
sedimentary
Slate
Slate (Metamorphic Rock)
metamorphic
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Slate
Slate (Metamorphic rock)
metamorphic
Gneiss
Foliated Metamorphic Rock
metamorphic
Dendritic limestone or marble slab
Manganese-oxide dendrites in carbonate rock, likely calcite (CaCO₃)
metamorphic
Quartz-rich metamorphic cobble (possibly quartzite)
Quartzite, composed predominantly of recrystallized quartz (SiO₂); identification is tentative from the image
metamorphic
Sandstone (Ferruginous)
Arenite with Iron Oxide staining (Fe2O3)
sedimentary
Crushed Stone / Gravel (Multiple Rock Types)
Lithic fragments (undifferentiated)
Igneous, Sedimentary, and Metamorphic mix
Cantera Opal (Mexican Fire Opal in Rhyolite Matrix)
Hydrated amorphous silica in rhyolite (SiO2·nH2O in volcanic matrix)
gemstone
Slate
Slate (Metamorphic Rock)
metamorphic
Basalt with Iron Oxidation
Extrusive Mafic Igneous Rock (composed of Plagioclase and Pyroxene)
igneous
Sandstone
Arenicola (comprising mostly Quartz, SiO2)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Greenstone (likely chlorite- or actinolite-rich metabasalt)
Metamorphosed mafic volcanic rock; commonly greenschist-facies basalt, composed chiefly of chlorite, actinolite, epidote, and albite
metamorphic
Schist
Mica Schist
metamorphic
Quartz-rich rock (likely quartzite)
Quartzite, composed predominantly of quartz (SiO₂)
metamorphic
Basalt
Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)
igneous
Shale
Fissile Mudstone (primarily composed of clay minerals and quartz)
sedimentary
Iron-stained quartzite
Quartzite, composed predominantly of quartz (SiO₂), with iron-oxide staining
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Rounded quartzite pebble
Quartzite, composed predominantly of recrystallized quartz (SiO₂)
metamorphic
Weathered granite
Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspars, and mica
igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Botryoidal Chalcedony Geode
Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz
mineral
Chert (Pebble)
Silicon Dioxide (SiO2)
sedimentary
Gneiss
Gneissic Metamorphic Rock
metamorphic
Serpentinite
Serpentinite, composed chiefly of serpentine-group minerals (antigorite, lizardite, chrysotile; approximately Mg₃Si₂O₅(OH)₄)
metamorphic
Likely quartz-bearing rock fragment
Quartz (SiO₂), possibly with iron-oxide staining or other mineral inclusions
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Sandstone Pebble
Quartz Sandstone
sedimentary