Gneiss
Gneiss
metamorphic
Category
Sedimentary Rock (Possibly Composed Of Various Minerals)
Browse sedimentary rock (possibly composed of various minerals) specimens identified by the Rock Identifier community.
Limonite
Hydrous Iron Oxide (often Goethite FeO(OH), Lepidocrocite γ-FeO(OH), and other amorphous iron oxyhydroxides)
Mineral
Granite
Granite (composed primarily of Quartz SiO2, Feldspar (KAlSi3O8), and Mica)
igneous
Hematite Nodules (Moqui Marbles style)
Iron Oxide (Fe2O3)
mineral
Chert
Silicon dioxide (SiO2)
Sedimentary
Geode (Unopened)
Siliceous Concretion / Geode
sedimentary
Granite
Granite (Phaneritic Quartz-Feldspar Igneous Rock)
igneous
Soapstone
Steatite (composed primarily of Talc, Mg3Si4O10(OH)2)
metamorphic
Sandstone
Arenite
sedimentary
Quartz
Silicon Dioxide (SiO2)
Mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Ironstone Concretion (Ironstone Gourd)
Limonite/Goethite Concretion (FeOO(H))
sedimentary
Tumbled Stones (various)
Mixed Silica-based Minerals (primarily Quartz and Chalcedony)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Fossiliferous Limestone (Coquina / Shell Conglomerate)
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Serpentinite
Serpentinite (composed largely of serpentine group minerals including Antigorite, Lizardite, or Chrysotile)
metamorphic
Chert (Arrowhead/Tool variety)
Microcrystalline Quartz (SiO2)
sedimentary
Ferruginous Sandstone
Arenite with Iron-oxide cement
sedimentary
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)
metamorphic
Chipped Glass/Plastic Fragment
Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic
Man-made material (simulant/artifact)
Jasper (specifically Brecciated or Agated Jasper)
Silicon Dioxide (SiO2) - Chalcedony with impurities
Mineral / Sedimentary
Shale
Fissile Mudstone
sedimentary
Gneiss
High-grade regional metamorphic rock (Foliated)
metamorphic
Conglomerate
Conglomerate (Sedimentary rock)
sedimentary
Epidote
Epidote Group (e.g., Clinozoisite, Epidote, Piemontite), Epidote formula: Ca2(Al,Fe)3(SiO4)3(OH)
Mineral
Conglomerate
Conglomerate (Sedimentary rock containing rounded clasts)
sedimentary
Quartz Geode/Cluster
Quartz (SiO2)
mineral
Limonite Pseudomorph after Pyrite
Goethite/Limonite FeO(OH)·nH2O replacing Pyrite FeS2
mineral
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Banded Calcite (often sold as 'Mexican Onyx')
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide mixture)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Greenstone
Metamorphosed Mafic Igneous Rock
metamorphic
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Green glass sphere/marble
Soda-lime glass (primarily SiO2, Na2O, CaO)
Man-made object (Simulant)
Schist (specifically Mica Schist)
Mica Schist (primarily composed of Muscovite KAl2(AlSi3O10)(OH)2 and Biotite)
metamorphic
Jasper Conglomerate (Puddingstone)
Siliceous Conglomerate (Quartz and Jasper clasts in a fine-grained matrix)
sedimentary
Gneiss (Pebble)
Gneiss
metamorphic
Granodiorite or Diorite
Granodiorite / Diorite
igneous
Epidote (or Epidote-rich rock)
Epidote. Mineral formula: Ca2(Al,Fe)3(SiO4)3(OH).
Mineral, often found in metamorphic rocks but also in sedimentary and igneous rocks