Sandstone
Arenite (primarily SiO2 with various cementing agents)
sedimentary
Category
Metamorphic Rock (Primarily Composed Of Minerals)
Browse metamorphic rock (primarily composed of minerals) specimens identified by the Rock Identifier community.
Learn about Metamorphic Rock (Primarily Composed Of Minerals) in the encyclopedia
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Gneiss (Banded Gneiss Cobble)
Gneiss
metamorphic
Staurolite-bearing mica schist (probable)
Mica schist composed chiefly of muscovite/biotite, quartz, and likely staurolite or garnet
metamorphic
Schist
Mica Schist
metamorphic
Granite
Phaneritic Plutonic Igneous Rock (primarily composed of quartz, alkali feldspar, and plagioclase)
igneous
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Granite Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Epidotite (Unakite-related Epidote)
Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
metamorphic
Talc
Talc (Mg₃Si₄O₁₀(OH)₂)
Mineral
Sandstone (with Iron Staining)
Arenite (Siliclastic sedimentary rock)
sedimentary
Quartz Vein in Hematitic Siltstone
Hydrothermal Quartz (SiO2) in Ferriferous Matrix
metamorphic
Fine-grained gray-green rock, likely basaltic or volcanic stone
Probable basalt or microcrystalline mafic igneous rock; exact identification requires a fresh surface and testing
igneous
Quartzite
Quartzite
metamorphic
Dalmation Jasper (Dalmation Stone)
Perthitic feldspar-quartz-amphibole rock
igneous
Aquamarine
Beryl (Be3Al2Si6O18)
gemstone
Quartz with Mica and Feldspar
Granitic Pegmatite Fragment (SiO2 + KAlSi3O8 + KAl2(AlSi3O10)(OH)2)
igneous
Quartzite Pebble
Metamorphic Rock (composed mainly of SiO2)
metamorphic
Sandstone (with man-made markings)
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Starfish Fossil
Asteroidea fossil
fossil
Granite (Pebble)
Intrusive Felsic Igneous Rock
igneous
Unakite
Altered Granite (Granitic Metamorphic Rock)
metamorphic
Bivalve Fossil (Fossilized Shell)
Class Bivalvia (fossilized in Calcium Carbonate/Aragonite)
fossil
Shale / Mudstone
Laminated Mudrock (Siliciclastic Sedimentary Rock)
sedimentary
Sandstone (Quartzose)
Arenite (Siliciclastic sedimentary rock)
sedimentary
Granite
Phaneritic Plutonic Felsic Rock
igneous
Sandstone (specifically Cross-bedded Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Gneiss
Gneiss
metamorphic
Banded Gneiss Pebble
Gneiss (Metamorphic Rock)
metamorphic
Basalt
Mafic volcanic rock, primarily composed of Plagioclase, Pyroxene, and Olivine
Igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Rhodonite
Rhodonite (Mn,Fe,Mg,Ca)SiO3
mineral
Sandstone
Quartz Arenite (a type of sandstone composed of more than 90% quartz)
Sedimentary Rock
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 inclusions)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone (Greywacke/Lithic Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide cement)
sedimentary
Red Quartzite (Strawberry Quartz)
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Red-and-green jasper
Jasper, microcrystalline quartz (SiO₂), colored mainly by iron oxides and possibly chlorite/epidote
mineral
Sandstone (Red Sandstone)
Arenite (SiO2 based with Fe2O3 staining)
sedimentary