Sandstone (Ferruginous)
Arenite with Iron Oxide cement (SiO2 + Fe2O3)
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
View all →
Bauxite
Bauxite (Al(OH)3, AlO(OH), AlOOH)
sedimentary
Lapis Lazuli
Complex rock primarily containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Bumblebee Jasper
Carbonate-rich volcanic rock containing Sulfur and Arsenic (Realgar/Orpiment)
sedimentary
Red Sandstone
Arenite (primarily Quartz with Iron Oxide coating)
sedimentary
Polished gneiss pebble
Quartz–feldspar–mica gneiss (exact mineral identification is uncertain from the image)
metamorphic
Serpentinite
Serpentinite (composed mainly of serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Basalt
Basalt
Igneous
Vesicular Basalt
Vesicular Basalt (rich in silicate minerals mostly Plagioclase and Pyroxene)
igneous
Septarian Nodule
Septaria (composed of Calcite, Aragonite, and Limestone)
sedimentary
Quartzite Pebble
Quartzite (composed primarily of SiO2)
metamorphic
Red Sandstone
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Peridotite / Olivine Xenolith
Ultramafic igneous rock primarily composed of olivine and pyroxene
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Likely greenstone (metamorphosed basalt)
Metabasalt; commonly composed of chlorite, actinolite, epidote, and albite
metamorphic
Limonite/Goethite on Shale
Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock
sedimentary
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, or Chrysotile)
metamorphic
Sandstone
Clastic sedimentary rock (primarily quartz arenite)
sedimentary
Quartzite (Beach Pebble)
Quartzite (composed primarily of SiO2)
metamorphic
Siltstone Pebble
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Dalmation Jasper (or Dalmation Stone)
Dalmation Stone (composed of Perthite, Quartz, and Arfvedsonite)
igneous
Conglomerate (Greenstone/Pebble Conglomerate)
Polymictic Conglomerate
sedimentary
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock composed primarily of Quartz, Feldspar, and various Micas)
metamorphic
Lapis Lazuli (Raw)
Lazurite-rich metamorphic rock; Na3Ca(Al3Si3O12)S
metamorphic
Granite / Diorite (Granodiorite)
Granodiorite / Quartz Diorite
igneous
Likely amphibolite
Amphibolite, composed mainly of hornblende (amphibole) and plagioclase feldspar
metamorphic
Greenstone / Greenschist
Greenschist (composed of Chlorite, Epidote, Actinolite)
metamorphic
Banded gneiss
Gneiss, commonly quartz–feldspar–mica gneiss
metamorphic
Serpentinite
Serpentinite (a rock composed predominantly of serpentine group minerals)
metamorphic
Quartzite (River Pebble)
Meta-quartzite (composed primarily of SiO2)
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Epidosite
Epidosite (composed primarily of Epidote and Quartz)
metamorphic
Gabbro
Phaneritic Mafic Plutonic Rock
igneous
Diorite
Intermediate Intrusive Igneous Rock
igneous
Likely amphibolite
Amphibolite, composed mainly of hornblende and plagioclase feldspar
metamorphic
Kambaba Jasper (Crocodile Jasper)
Stromatolitic Rhyolite/Jasper (SiO2)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Dragon Blood Jasper (Dragon Stone)
Epidote-Piemontite/Quartzite Rock
metamorphic
Greenschist
Greenschist (composed of Chlorite, Actinolite, and Epidote)
metamorphic
Bauxite
AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)
sedimentary
Granite
Intrusive Igneous Rock
igneous