Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Category
Metamorphic Rock (Specifically A Rock Composed Of Minerals)
Browse metamorphic rock (specifically a rock composed of minerals) specimens identified by the Rock Identifier community.
Learn about Metamorphic Rock (Specifically A Rock Composed Of Minerals) in the encyclopedia
View all →
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
Yellow Quartz (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Epidosite
Epidosite (composed primarily of Epidote and Quartz)
metamorphic
Conglomerate
Conglomerate (a clastic sedimentary rock)
Sedimentary Rock
Limonite/Goethite on Shale
Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock
sedimentary
Gneiss
Foliated Metamorphic Rock (Gneiss)
metamorphic
Sandstone with Manganese Oxide Patina
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Brown Antique Granite
Anorthosite (Technically a plutonic rock composed mainly of plagioclase feldspar)
igneous
Desert Rose (Gypsum Rose)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Sandstone
Arenite (Siliclastic sedimentary rock), SiO2 + various minerals
sedimentary
Red Sandstone
Arenite (with Iron Oxide / Hematite cementation)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt
igneous
Schist with Biotite Inclusion
Biotite-bearing Mica Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Schist
Metamorphic rock (Schist)
metamorphic
Bauxite
Bauxite (Al(OH)3 mixed with Fe2O3 and clay minerals)
sedimentary
Red Sandstone (Iron-Rich)
Arenite (Fe2O3)
sedimentary
Conglomerate
Conglomerate (Clastic sedimentary rock)
sedimentary
Diorite
Intermediate Phaneritic Igneous Rock (Diorite)
igneous
Granite
Granite (Plutonic Igneous Rock)
igneous
Sandstone
Sandstone (Sedimentary rock composed of silicate grains)
sedimentary
Quartzite Pebble (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
metamorphic
Sandstone
Arenite (SiO2 + various cementing minerals)
sedimentary
Serpentinite
Serpentinite (composed mainly of Serpentine-group minerals: (Mg, Fe)3Si2O5(OH)4)
metamorphic
Dalmation Jasper
Dalmation Stone (perthitic feldspar with arfvedsonite)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Pink Granite / Gneiss
Felsic Plutonic Rock (Granite) with Gneissic banding
igneous / metamorphic
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Gneiss
Gneiss (foliated metamorphic rock)
metamorphic
Granite Gneiss
Granitic Gneiss
Metamorphic
Quartz Druzy
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Granite cobble
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Granite (Pebble)
Granite (composed of Quartz, Feldspar, and Mica/Amphibole)
igneous
Red Sandstone
Arenite (high iron oxide content)
sedimentary
Quartz-rich gravel fragment
Quartz (silicon dioxide, SiO₂), possibly with feldspar or carbonate inclusions
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Montana Moss Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Unakite
Epidotized Granite (Composed of Orthoclase Feldspar, Epidote, and Quartz)
metamorphic
Orange Calcite (likely polished specimen)
Calcite
Mineral