Sandstone (Wonderstone)
Arenite (composed primarily of SiO2 with Fe2O3 impurities)
sedimentary
Category
Rock
Browse rock specimens identified by the Rock Identifier community.
Sandstone (Banded Sandstone)
Clastic Sedimentary Rock (primarily SiO2 with iron oxide impurities)
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Iron-stained quartz-rich rock, possibly quartzite or silicified breccia
Quartz (SiO₂)-dominant rock with iron-oxide minerals, chiefly hematite/goethite
metamorphic
Sedimentary Rock Fragments
Clastic Sedimentary Rock
sedimentary
Quartz Vein in Sandstone
Quartz (SiO2) in Clastic Sedimentary Rock
sedimentary
Quartz-bearing metamorphic rock, likely quartzite
Quartzite; predominantly quartz (SiO₂), with possible feldspar, mica, and iron-oxide staining
metamorphic
Tumbled yellow jasper or chert pebble
Microcrystalline quartz (SiO₂), likely jasper/chert with iron-oxide staining
sedimentary
Quartz-veined Basalt
Amygdaloidal or Porphyritic Basalt with Silicon Dioxide (SiO2) vein
igneous
Tiger's Iron
Pseudomorphic Quartz Aggregate (contains SiO2 with Fe2O3 and FeOOH)
metamorphic
Pink Granite
Granitoid (rich in Potassium Feldspar)
igneous
Rounded gray metamorphic rock, likely quartzite or gneiss
Quartz-rich metamorphic rock; exact identification is uncertain from the photograph
metamorphic
Sodalite with Syenite (Yooperlite)
Sodalite in Syenite (Na8(Al6Si6O24)Cl2)
mineral
Lapis Lazuli
(Na,Ca)8(AlSiO4)6(SO4,S,Cl)2 (Complex silicate rock)
rock
Granite Pebble
Granite
igneous
Quartzite with inclusions
Quartzite
metamorphic
Granite
Intrusive Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)
igneous
Granite Pebble
Phaneritic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite Gneiss
Granitic Gneiss
Metamorphic
Geode Nodule Fragment
Quartz / Chalcedony Nodule
sedimentary
Gneiss
Gneiss
metamorphic
Massive Quartz (Milky or Gray)
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (high-grade metamorphic silicate rock)
metamorphic
Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Sedimentary or Metamorphic (low-grade)
Wishing Stone (Basalt or Siltstone with Quartz/Calcite Vein)
Basalt (SiO2+MgO+FeO) or Siltstone with a Quartz (SiO2) or Calcite (CaCO3) vein
igneous or sedimentary
Wishing Stone with Quartz Veins
Quartzite or Quartz-veined Metamorphic Rock (composed mainly of SiO2)
metamorphic
Cockle Shell Fossil
Cardiidae family (Bivalvia)
fossil
Copper Ore (Malachite and Azurite stained rock)
Copper-bearing rock with secondary copper carbonates
mineral
Cannonball Concretion
Calcite-cemented Sandstone Concretion
sedimentary
Fossil Brachiopod or Mollusk Cast
Phylum Brachiopoda / Mollusca internal mold
fossil
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Basalt Pebble
Extrusive Igneous Rock
igneous
Seashell Fossil
Gastropoda fossil
fossil
Sandstone (specifically Banded Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Granite and Igneous Rock Collection
Intrusive igneous rock / Granitoid
igneous
Shale
Lutaceous sedimentary rock
sedimentary
Basalt
Extrusive Igneous Rock
igneous
Lapis Lazuli
Lapis Lazuli (Primary mineral: Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Gneiss (Metamorphic Rock)
Gneiss (variable mineral formula primarily containing Quartz, Feldspar, and Mica)
metamorphic