Mica Schist
Foliated Metamorphic Rock (Schist)
metamorphic
Category
Rock (Likely Sedimentary)
Browse rock (likely sedimentary) specimens identified by the Rock Identifier community.
Carnelian
Carnelian (Chalcedony / SiO2)
mineral
Mixed collection of Quartz varieties, Chalcedony, and metamorphic pebbles
Mixed gemstones (primarily Silicon Dioxide - SiO2)
mineral
Ironstone Concretion (Moqui Marble variety)
Ferruginous Sandstone Concretion
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Fluorite with Quartz coating
Calcium Fluoride (CaF2) with Silicon Dioxide (SiO2)
mineral
African Turquoise
African Turquoise (a trade name for Jasper, a variety of Chalcedony: SiO2)
sedimentary
Quartz Vein in Host Rock (Breccia/Rhyolite)
Silicon Dioxide (SiO2) with matrix
Mineral in Igneous/Sedimentary host
Jasper
Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz (Milky Quartz / Quartzite)
Silicon Dioxide (SiO2)
mineral
Black Opal
Hydrated silica (SiO2·nH2O)
mineraloid
Mookaite Jasper
Silicon Dioxide (SiO2) - Radiolarite
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Chert (concretionary/nodular variant)
Microcrystalline Quartz (SiO2) with possible fossil or mineral inclusions
sedimentary
Herkimer Diamond (Quartz Crystal)
Silicon Dioxide (SiO2)
mineral
Yellow Chalcedony (common opal or chert variant)
Silicon Dioxide (SiO2)
sedimentary (mineraloid/microcrystalline quartz)
Druzy Quartz Geode (Vug)
Silicon Dioxide (SiO2)
mineral
Ironstone Concretion / Goethite Nodules
Ironstone (composed primarily of Goethite FeO(OH) and Limonite)
sedimentary
Orthoceras Fossil in Limestone
Orthoceras (extinct genus of cephalopods), mineralized as Calcite (CaCO3) in Fossiliferous Limestone
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Dalmatian Stone
Dalmatian Jasper (a misnomer) / Perthitic Igneous Rock
igneous
Turquoise in Matrix
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Sandstone (with Iron Siderite Concretion)
Arenite with Ironstone Concretion (FeCO3)
sedimentary
Sandstone (specifically Red Sandstone)
Arenite (SiO2 with Iron Oxide)
sedimentary
Sandstone (Red)
Arenite (primarily SiO2 with Iron Oxide staining)
sedimentary
Red Sandstone
Arenite (Fe2O3 rich)
sedimentary
Red Sandstone
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Chert (Jasper)
Silicon dioxide (SiO2)
sedimentary
Gneiss
Gneiss
metamorphic
Almandine Garnet
Almandine (Fe3Al2Si3O12)
mineral
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (with cross-bedding)
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Shale
Fissile Mudstone (primarily composed of clay minerals and quartz grains)
sedimentary
Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Calamites (Fossilized Horsetail)
Calamites suckowii (Family: Calamitaceae)
sedimentary
Ferruginous Sandstone
Sandstone (rich in iron oxides/hydroxides)
sedimentary