Basalt
Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)
igneous
Category
Igneous Or Metamorphic (Base Stone); Anthropogenic (Decoration)
Browse igneous or metamorphic (base stone); anthropogenic (decoration) specimens identified by the Rock Identifier community.
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Rose Quartz
Silicon dioxide (SiO2)
mineral
Dyed Quartzite
Metamorphosed Quartz (SiO2) with synthetic pigment
metamorphic
Weathered mafic rock, likely basalt or gabbro
Basalt–gabbroic rock; chiefly plagioclase feldspar and pyroxene, with possible olivine and magnetite
igneous
Granite
Phaneritic felsic intrusive igneous rock; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende
igneous
Muscovite Mica
Muscovite - KAl2(AlSi3O10)(F,OH)2
mineral
Greenschist
Chlorite schist
metamorphic
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Schist
Mica Schist
metamorphic
Graphite
Graphite (Native Carbon), Formula: C
Metamorphic
Sandstone (likely Fossilized Wood or Concrete Simulacrum)
Arenite / Silicified Wood / Anthropogenic Concrete
sedimentary
Biotite / Black Mica
K(Mg,Fe)3(AlSi3O10)(F,OH)2
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(F,OH)2)
mineral
Graphite
Graphite (Carbon, C)
mineral
Tumbled orbicular granite or granitic gneiss
Granite, chiefly quartz–feldspar–biotite/amphibole; exact variety uncertain from the image
igneous
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Banded Agate (specifically Botryoidal/Orbicular Agate)
Silicon Dioxide (SiO2)
Mineral (variety of Chalcedony/Quartz)
Magnetite-rich iron ore
Magnetite (Fe₃O₄), possibly massive magnetite/ironstone
mineral
Smoky Quartz Cluster
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Labradorite (Polished Sphere)
Labradorite ((Ca, Na)(Al, Si)4O8)
mineral
Epidosite (Epidote-rich rock)
Epidosite (consisting primarily of Epidote: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))
metamorphic
Weathered quartz-rich pebble
Likely quartz-bearing granite or granitic gneiss; exact identification requires testing
igneous
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Epidote
Ca2(Al, Fe)3(SiO4)3(OH)
mineral
Muscovite
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Muscovite Mica
Muscovite: KAl2(AlSi3O10)(OH)2
mineral
Banded Quartz with Host Rock / Quartz Vein Pebble
Silicon Dioxide (SiO2) in Metamorphic Matrix
metamorphic
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Greenschist (Chlorite Schist)
Greenschist (Metamorphic rock dominated by chlorite, actinolite, and epidote)
metamorphic
Coarse Sand or Fine Gravel
Detrital Sedimentary Fragments (mostly SiO2)
sedimentary
Muscovite Mica
Muscovite - KAl2(AlSi3O10)(F,OH)2
mineral
Gneiss (with Quartz and Biotite Mica)
Gneiss
metamorphic
Muscovite Mica
Muscovite (Potassium Aluminum Silicate) - KAl2(AlSi3O10)(F,OH)2
mineral
Polished tiger iron
Tiger iron; interbanded tiger’s-eye (quartz), red jasper, and specular hematite/magnetite
metamorphic
Biotite (Mica)
Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)
mineral
Sandstone (Arkose)
Arkose Sandstone (principally SiO2 with Feldspar)
sedimentary
Landscape Boulder / River Rock
Granitic or Quartzite Rock
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Gneiss (specifically a Banded Gneiss pebble)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Likely basalt or mafic metamorphic rock
Basalt, predominantly plagioclase feldspar and pyroxene; possibly metamorphosed to amphibolite
igneous
Basalt with Vesicular Amygdule
Extrusive igneous rock (Mafic)
igneous