Basalt
Basalt
igneous
Category
Sedimentary (Processed Mineral Product)
Browse sedimentary (processed mineral product) specimens identified by the Rock Identifier community.
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Granite
Granite (Felsic Plutonic Rock)
igneous
Epidote (Unakite-related)
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Opalite
Man-made opalized glass
mineral
Gabbro
Gabbro
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Granite
Granite
igneous
Pink Granite
Phaneritic Acidic Igneous Rock (Rich in K-feldspar)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Aventurine (Green)
Silicon Dioxide (Quartz with inclusions of Fuchsite)
metamorphic
Tumbled sodalite
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂
mineral
Diorite (Salt and Pepper Rock)
Phaneritic Plutonic Diorite; chemical composition roughly 52-63% silica (SiO2)
igneous
Iron-oxide-stained rock, likely limonite/goethite-rich material
Likely goethite (α-FeO(OH)) and/or limonite (a mixture of hydrated iron oxides), staining a silicate-rich rock
mineral
Red Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Copper-bearing sulfide ore, possibly chalcopyrite-rich
Chalcopyrite (CuFeS₂), possibly with bornite and oxidation products
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Tumbled Stone Assortment
Various silicate minerals (e.g., Quartz, Feldspar)
mineral
Likely quartz-rich rock fragment
Quartz (SiO₂), possibly a fragment of quartzite or silica-rich slag
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Copper slag or vesicular basalt with copper minerals
Industrial slag / Basaltic matrix with secondary copper minerals
igneous
Hematite
Iron(III) oxide (Fe2O3)
mineral
Weathered granite or granitic gneiss
Granite, chiefly quartz–feldspar–mica; possibly weakly gneissic
igneous
Polished dark pebble, likely basalt
Basalt; mainly plagioclase feldspar, pyroxene, and minor olivine or magnetite
igneous
Weathered granite
Granite; interlocking quartz–feldspar–mica aggregate
igneous
Weathered quartz-rich rock fragment
Likely quartz-bearing vein rock, possibly quartzite or silicified breccia; exact identification requires testing
mineral
Fossilized Tooth Fragment
Vertebrate Fossil (Mammalia indet.)
fossil
Vesicular basalt (possibly slag-contaminated)
Basalt; chiefly plagioclase and pyroxene, with possible olivine and secondary minerals
igneous
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Milky quartz (rough fragment)
Quartz, silicon dioxide (SiO₂)
mineral
Dyed or coated quartz geode
Quartz geode; silicon dioxide (SiO₂), likely artificially color-enhanced
mineral
Quartz (Quartzite Pebble)
Silicon Dioxide (SiO2)
mineral
Pumice or Vesicular Basalt
Vesicular volcanic rock
igneous
Tumbled amethyst
Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation
gemstone
Aragonite Star Cluster
Aragonite (Calcium Carbonate, CaCO3)
mineral
White Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Gemstone Beads
Various mineral species
gemstone
Pumice
Pumice
igneous
Rhodonite
Inosilicate (Mn,Fe,Mg,Ca)SiO3
mineral
Fossilized Shark Tooth
Chondrichthyes tooth fossil
fossil
Weathered quartz-rich rock fragment
Likely quartz-bearing feldspathic rock; exact identification requires testing
mineral
Vesicular scoria (likely iron-rich volcanic scoria)
Scoria, typically basaltic to andesitic; chiefly plagioclase, pyroxene, olivine, and volcanic glass
igneous