Blue-gray calcite (likely cleavage specimen)
Calcite, CaCO₃
mineral
Category
Sedimentary Or Mineral
Browse sedimentary or mineral specimens identified by the Rock Identifier community.
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Pink Granite Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Quartz Geode
SiO2 (Silicon Dioxide)
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral
Botryoidal Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite in Matrix (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Tumbled brecciated jasper
Silica-rich microcrystalline quartz/chalcedony (SiO₂), with iron-oxide and other mineral inclusions
mineral
Geode
Quartz / Chalcedony nodule with mineralized cavity
sedimentary
Sandstone (Sedimentary Rock)
Arenite (SiO2 based)
sedimentary
Ironstone (Limonite/Hematite)
Ferruginous sedimentary rock (Fe2O3·nH2O / Fe2O3)
sedimentary
Painted River Rock
Artificially Coated Sedimentary Rock
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (likely Arkosic or Lithic Sandstone)
Clastic Sedimentary Rock (SiO2 with assorted minerals)
sedimentary
Fossil / Permineralized Bone
Tyrannosaurus rex fossil (Hydroxylapatite replaced by various minerals)
sedimentary
Ironstone Concretion (Limonite/Goethite)
Ferruginous Sandstone or Limonite (FeO(OH)·nH2O)
sedimentary
Sedimentary Breccia
Breccia (Clastic Sedimentary Rock)
sedimentary
Gypsum (Desert Rose or Selenite variety)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Rhodochrosite
Rhodochrosite (MnCO3)
mineral
Sandstone
Clastic sedimentary rock (primarily Quartz)
sedimentary
Weathered Pyrite Nodule
Iron Sulfide (FeS2) undergoing oxidation to limonite/goethite
mineral
Fossil Shell (Bivalve)
Class Bivalvia (fossilized)
fossil
Limonite Nodules / Goethite
Hydrated Iron Oxide-Hydroxide (FeO(OH)·nH2O / Fe2O3·nH2O)
mineral
Citrine
SiO2 (Silicon Dioxide)
mineral
Fluorite (Fluor-spar)
Calcium Fluoride (CaF2)
mineral
Gneiss
Gneiss
metamorphic
Sandstone with Iron Concretion
Arenite with Limonite/Goethite Concretion
sedimentary
River Stones (Quartzite and Sandstone)
Quartzite / Sedimentary Rock (SiO2 dominant)
sedimentary
Pyrite Cubes in Matrix
Iron Disulfide (FeS2) in Host Matrix
mineral side rock
Fluorite
Calcium Fluoride (CaF2)
mineral
Sandstone with Quartz Sphere
Arenite (SiO2-rich sedimentary rock) with Quartzite/Rose Quartz sphere
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Banded sandstone pebble
Lithic or quartz-rich sandstone; exact composition requires testing
sedimentary
Gravel
Unconsolidated rock fragments / detrital sediment
sedimentary
Sandstone (Weathered Pebble)
Sedimentary Rock (Quartz arenite)
sedimentary
Quartz in Limonite-rich Matrix
Silicon Dioxide (SiO2) with Goethite/Limonite FeO(OH)·nH2O
Mineral in Sedimentary/Secondary host
Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Banded Sandstone (River Cobble)
Arenite Sandstone with heavy mineral layering
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Satin Spar (Gypsum)
Hydrous calcium sulfate (CaSO4·2H2O)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Selenite
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral