Fossiliferous Limestone
Calcite-rich Sedimentary Rock (CaCO3)
sedimentary
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
Browse industrial byproduct (anthropogenic rock like material) specimens identified by the Rock Identifier community.
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Vesicular Basalt (Iron-rich)
Scoriaceous Basalt / Oxidized Vesicular Basalt
igneous
Granitic Pegmatite with Muscovite Mica
Pegmatite (containing KAl2(AlSi3O10)(OH)2)
igneous
Iron-stained Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
mineral
Granite (Phaneritic Igneous Rock)
Granite
igneous
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Aragonite Star Cluster (or Aragonite Sputnik)
Aragonite (Orthorhombic Calcium Carbonate, CaCO3)
mineral
United States Quarter Dollar
Cupronickel Clad Alloy (75% Copper, 25% Nickel over a 100% Copper core)
Metal / Man-made mineral-like object
Pink Granite
Phaneritic plutonic rock (dominated by Alkali Feldspar)
igneous
Puddingstone (Gowganda Tillite/Jasper Conglomerate)
Jasper Conglomerate (SiO2 primary composition)
sedimentary
Peridotite
Peridotite (primarily Olivine and Pyroxene)
igneous
Diorite (Salt and Pepper Rock)
Diorite
igneous
Quartzite Pebble
Metamorphic Quartz (SiO2)
metamorphic
Gneiss
Gneiss (High-grade regional metamorphic rock)
Metamorphic
Sandstone (likely Arkosic)
Clastic Sedimentary Rock (primarily SiO2 with Feldspar)
sedimentary
Quartz
Quartz (SiO2)
Mineral
Sandstone
Quartz Arenite (a type of sandstone composed of more than 90% quartz)
Sedimentary Rock
Basalt
Basalt (Aphanitic Mafic Volcanic Rock)
Igneous
Grey Slate
Foliated Metamorphic Rock (formed by low-grade regional metamorphism of shale or mudstone)
metamorphic
Greenschist (Chlorite Schist)
Greenschist (Metamorphic rock dominated by chlorite, actinolite, and epidote)
metamorphic
Limonite (Iron Ore/Sandstone mixture)
Limonite (FeO(OH)·nH2O) often mixed with Goethite and sedimentary matrix
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Biotite Mica
K(Mg,Fe)3AlSi3O10(OH)2
Mineral in a matrix (likely quartz or feldspar)
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Basalt with Iron Oxide staining
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Chert (Brecciated Chert)
Silicon Dioxide (SiO2)
sedimentary
Ironstone (likely Ferruginous Siltstone/Sandstone)
Ferruginous sedimentary rock (FeOx-rich clastic)
sedimentary
Sandstone (likely Arkosic or Lithic Sandstone)
Clastic Sedimentary Rock (SiO2 with assorted minerals)
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Quartz-veined Metamorphic Rock
Quartz Vein in Phyllite or Schist (SiO2 in Silicate Matrix)
metamorphic
Chert (specifically Yellow/Brown Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
River Pebble (Likely Quartzite or Chalcedony)
Silicon Dioxide (SiO2) - granular metamorphic variety
metamorphic
Bauxite
Alumina-rich rock (consisting of Gibbsite, Boehmite, and Diaspore)
sedimentary
Red Quartzite
Quartzite (SiO2 with iron oxide impurities)
metamorphic
Silicon
Element Si
mineral
Red Garnet (likely Almandine or Pyrope)
Garnet group: X3Y2(SiO4)3 (e.g., Almandine: Fe3Al2Si3O12)
mineral
Cubic Zirconia (CZ) Jewelry
Zirconium dioxide (ZrO2)
mineral (synthetic)
Limestone (Grey and White specimens)
Calcium Carbonate (CaCO3)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Brick
Fired clay or Ceramic material (no specific mineralogical scientific name as it's a composite)
Man-made material (constructed)
Aragonite / Calcite Geode
Calcium Carbonate (CaCO3)
mineral