Red Sandstone
Quartz Arenite (with Iron Oxide)
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 →
Turquoise (set in silver jewelry)
Turquoise - CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminum phosphate)
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Mixed Gemstone Bracelet
Mixed natural minerals and rocks (e.g., Rhodonite, Malachite, Sodalite, Rose Quartz, Black Tourmaline, Quartz/Chalcedony variants)
Mineral/Rock assemblage
River Stone (Quartzite)
Metamorphic Quartzite (primarily SiO2)
metamorphic
Blue Quartz (Blue Chalcedony/Dumortierite Quartz)
Silicon Dioxide (SiO2) with inclusions (typically Dumortierite Al7(BO3)(SiO4)3O3)
mineral
Snakeskin Jasper
Silicon Dioxide (SiO2) with iron oxide and calcium carbonate inclusions
sedimentary
Conglomerate
Conglomerate (SiO2 matrix with various silicate clasts)
sedimentary
Metaconglomerate
Protolith: Conglomerate (comprising SiO2, Al2O3, etc.)
metamorphic
Limonite (Iron Ore)
Limonite (Hydrous iron(III) oxide-hydroxide mixture, primarily FeO(OH)·nH2O)
mineral
Iolite-bearing Gneiss (Cordierite)
Cordierite (Mg2Al4Si5O18) in Gneiss matrix
metamorphic
Grey Agate (Banded Chalcedony)
Agate (Silicon Dioxide - SiO2)
mineral
Turquoise
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Vesicular Basalt (Iron-rich)
Scoriaceous Basalt / Oxidized Vesicular Basalt
igneous
Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)
Chert (microcrystalline quartz)
Metamorphic Rock
Schist
Mica Schist (Variable chemistry, often rich in muscovite and biotite)
metamorphic
Quartz Druzy in Brecciated Matrix
Silicon Dioxide (SiO2) in Lithic Breccia
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (SiO2 + Fe2O3)
sedimentary
Unakite
Epidotized Granite
metamorphic
Granite
Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Shale with Vein Infillings
Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.
Sedimentary Rock
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic extrusive volcanic rock with secondary mineral infilling)
igneous
Green Aventurine
Silicon Dioxide (SiO2 with Fuchsite inclusions)
metamorphic
Red Sandstone
Arenite (with Iron Oxide cement)
sedimentary
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Magnetite (Small Granule)
Magnetite (Fe3O4)
mineral
Blue Quartzite (Aventurine variety)
Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebeckite
metamorphic
Limonite (Ironstone)
Limonite (FeOO·nH2O)
mineral
Aragonite Star Cluster
Aragonite (Calcium Carbonate, CaCO3)
mineral
Gneiss
Gneiss
metamorphic
Dalmatian Stone
Peralkaline Feldsphathic Igneous Rock
igneous
Bumblebee Jasper
Fossiliferous Calcite containing Orpiment and Realgar
sedimentary
Banded Gneiss
Gneiss (pronounced "nice")
Metamorphic Rock
Schist
Chlorite-Mica Schist
metamorphic
Wonderstone Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Yellow Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
River Cobble (Quartzite)
Meta-orthoquartzite
metamorphic
Greenstone
Metabasalt / Chlorite Schist
metamorphic
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Red Sandstone Pebble
Arenite (primarily Quartz SiO2 with Hematite Fe2O3 staining)
sedimentary