Ironstone Concretion / Chert Nodules
Iron-rich Sedimentary Concretion (Fe2O3 / SiO2 mix)
sedimentary
Category
Mineral And Sedimentary
Browse mineral and sedimentary specimens identified by the Rock Identifier community.
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Sandstone
Arenite (SiO2 principal)
sedimentary
Sandstone with Iron Concretion
Arenite with Limonite/Goethite Concretion
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Quartzwacke / Impure Sandstone
Arenite with minor lithic fragments (Silicon Dioxide matrix)
sedimentary
Pink Granite Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Banded Sandstone (River Pebble)
Arenite (SiO2 primarily)
sedimentary
Foliated Metamorphic Rock (likely Gneiss or Schist)
Gneissic Metamorphic Rock
metamorphic
Fluorite (Fluor-spar)
Calcium Fluoride (CaF2)
mineral
Tumbled Agate
Silicon Dioxide (SiO2)
gemstone
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Weathered iron-rich sandstone or lateritic rock
Quartz-rich sandstone with iron-oxide/hydroxide cement; possible goethite-bearing laterite
sedimentary
Fossil Shell (Bivalve)
Class Bivalvia (fossilized)
fossil
Amethyst Geode
Quartz (Silicon Dioxide, SiO2) with iron impurities
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Red Sandstone Pebble
Sedimentary quartz sandstone
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Shale
Argillaceous Sedimentary Rock
sedimentary
Sandstone (likely Arkosic)
Clastic Sedimentary Rock
sedimentary
Sandstone (likely Siltstone or fine-grained Sandstone)
Sedimentary Rock (Clastic)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Blue Quartz
Silicon Dioxide (SiO2) with inclusions
mineral
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Cleavable Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Optical Calcite
Calcium Carbonate (CaCO3)
mineral
Geode or Concretion
Silica-filled nodule (likely SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Sandstone with Secondary Mineral Encrustation
Arenite with Silica/Calcite deposits (SiO2 or CaCO3)
sedimentary
Geode
Quartz / Chalcedony nodule with mineralized cavity
sedimentary
Bivalve Fossil (Shell-bearing Sedimentary Rock)
Class Bivalvia (Phylum Mollusca) within a Calcarenite/Sandstone matrix
fossil
Small white mineral fragment
Indeterminate; possibly quartz, calcite, or feldspar
mineral
Conglomerate
Conglomerate (Clastic Sedimentary Rock)
sedimentary
Sandstone with Iron Staining
Arenite (SiO2 with FeO(OH) impurities)
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral