Celestite
Celestine (Strontium Sulfate, SrSO4)
mineral
Category
Mineral And Sedimentary
Browse mineral and sedimentary specimens identified by the Rock Identifier community.
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Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
mineral
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Mookaite Jasper
Silicon Dioxide (SiO2) with various mineral inclusions
sedimentary
Jasper with Quartz inclusions
Silicon Dioxide (SiO2) with varying mineral impurities
sedimentary
Polychrome Jasper (Desert Jasper)
Silicon Dioxide (SiO2) with iron and mineral inclusions
sedimentary
Greyling Sandstone / Greywacke
Lithic Wacke (SiO2 + diverse mineral fragments)
sedimentary
Red Jasper
Jasper (Silicate Mineral), SiO2 with Fe2O3 inclusions
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Gneiss (specifically Micaceous Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartz-rich Pebble)
Arenite (primarily SiO2)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)
sedimentary
Siltstone
Siltstone (primarily SiO2 with clay minerals)
sedimentary
Siltstone or Fine-grained Sandstone pebble
Siltstone (primarily SiO2 with clay minerals)
sedimentary
Ammonite Fossil (Polished Section)
Ammonoidea (typically mineralized with Calcite CaCO3)
sedimentary
Yellow Jade (often Serpentine or Dolomite)
Primarily Serpentine (Mg3Si2O5(OH)4) or Dolomite (CaMg(CO3)2), though the term 'yellow jade' is also sometimes applied to varieties of true nephrite or jadeite.
Mineral, often a rock given its aggregate nature
Chert Nodule (Fossiliferous Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Glauconite (Greensand Articulated Sandstone)
Glauconite ((K, Na)(Fe, Al, Mg)2(Si, Al)4O10(OH)2)
sedimentary
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Quartz Vein in Sandstone
Hydrothermal Quartz (SiO2) in Arenite
sedimentary
Bauxite / Iron-rich Laterite
Laterite (principally Al(OH)3, Fe2O3, and SiO2)
sedimentary
Polychrome Jasper
Silicon Dioxide (SiO2) with iron and other mineral inclusions
sedimentary
Sandstone (Quartzose Sandstone Pebble)
Arenite (primarily SiO2)
sedimentary
Sandstone (Wonderstone)
Silicified Sandstone / Orthoquartzite with Liesegang rings
sedimentary
Calamites (Fossilized Horsetail)
Calamites suckowii (Family: Calamitaceae)
sedimentary
Red Moss Agate (Jasper)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Sandstone (Weathered)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (CaCO3/SiO2 cemented quartz)
sedimentary
Garnet (Almandine/Pyrope variety)
Silicate mineral group; typically Fe3Al2(SiO4)3 (Almandine) or Mg3Al2(SiO4)3 (Pyrope)
mineral
Quartz Geode
Crystalline Quartz (Silicon Dioxide, SiO2)
mineral
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Fossil Sand Dollar (Echinoidea)
Phylum Echinodermata, Class Echinoidea (likely Dendraster or Scutella)
sedimentary
Spinosaurus Tooth
Spinosaurus aegyptiacus (fossilized in Hydroxyapatite)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary