Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Category
Mineral And Sedimentary
Browse mineral and sedimentary specimens identified by the Rock Identifier community.
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Gold Mineral
Native Gold (Au)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Bivalve Fossil
Bivalvia (Phylum Mollusca)
Fossil
Calcite
Calcium Carbonate (CaCO3)
mineral
Barite
Barium Sulfate (BaSO4)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Conglomerate
Sedimentary Conglomerate
sedimentary
Brachiopod Fossil in Limestone
Phylum Brachiopoda (likely Order Spiriferida), CaCO3 (Calcite)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Limonite/Ironstone
Limonite (FeO(OH)·nH2O)
mineral
Jasper with Purple Fluorite or Chalcedony
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Shale (with Iron Staining)
Argillaceous mudstone / Shale
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-oxide cemented)
sedimentary
Sandstone (with Limonite staining)
Arenite (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Limonite (Ironstone)
FeO(OH)·nH2O
sedimentary
Limonite / Ironstone
Hydrated Iron Oxide (FeO(OH)·nH2O)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Limonite
FeO(OH)·nH2O
mineral
Graphite
Graphite (Carbon, C)
mineral
Pyrite with Quartz
Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)
mineral
Breccia Pebble
Sedimentary Breccia
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Polished Hematite Tower
Hematite (Fe2O3)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone
Arenite (Siliclastic sedimentary rock), SiO2 + various minerals
sedimentary
Sandstone
Arenite (clastic sedimentary rock)
sedimentary
Limonite (Iron Ore)
Hydrated ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Quartz-veined Sandstone
Sedimentary rock with quartz vein (SiO2)
sedimentary
Agate
SiO2
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Unidentified Dark Mineral or Rock
Indeterminate (Likely Silicon Dioxide or Carbon-based)
mineral
Gneiss
Gneiss
metamorphic
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
sedimentary
Sandstone (with carbonaceous plant fragments)
Arenite (composed primarily of SiO2)
sedimentary
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Blue Howlite (Dyed)
Dyed Howlite (Calcium Borosilicate Hydroxide, Ca2B5SiO9(OH)5)
mineral
Blue Howlite (Dyed)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Geode half
Geode (often quartz/chalcedony based)
sedimentary or igneous