Hematite
Iron(III) oxide (Fe2O3)
Category
Browse sedimentary (chemically precipitated) or metamorphic specimens identified by the Rock Identifier community.
Hematite
Iron(III) oxide (Fe2O3)
Tufa (Calcareous Tufa)
Calcareous Tufa (Precipitated CaCO3)
Fluorite
Calcium Fluoride (CaF2)
Jasper
Cryptocrystalline Quartz (SiO2)
Chert Arrowhead (Lithic Tool)
Microcrystalline quartz (SiO2) - Archeological lithic artifact
Hematite (Ironstone) Nodule
Hematite (Fe2O3)
Orange Calcite
Calcium Carbonate (CaCO3)
Limonite (Iron Ore)
Goethite and related iron hydroxides (FeO(OH)·nH2O)
Dyed Agate
Microcrystalline Quartz (SiO2) with artificial pigment
Orange Calcite
Calcium Carbonate (CaCO3)
Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
Sandstone
Arenite (Sedimentary Rock)
Banded calcite (likely cave deposit or vein fragment)
Calcite, CaCO₃
Aragonite (Banded Calcite / 'Mexican Onyx')
Aragonite (Calcium Carbonate - CaCO3)
Quartz Crystal on Matrix
Silicon Dioxide (SiO2)
Chert (Green)
Silicon Dioxide (SiO2)
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
Limonite on Sandstone
Iron Oxyhydroxide (FeO(OH)·nH2O) on Quartz Sandstone
Chert (with Patina)
Microcrystalline Quartz (SiO2)
Quartz
Silicon dioxide (SiO2)
Quartz
SiO2 (Silicon Dioxide)
Milky Quartz
Silicon Dioxide (SiO2)
White Quartz
Silicon Dioxide (SiO2)
Limestone with Calcite Veining
Calcium Carbonate (CaCO3) - Biogenic/Chemical Sedimentary Rock
Aragonite
Aragonite (Calcium Carbonate - CaCO3)
Milky quartz
Quartz (silicon dioxide, SiO₂)
Limonite (Iron Ore)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Chalcedony (Agate/Carnelian-like)
Silicon Dioxide (SiO2)
Green Calcite
Calcite (CaCO3)
Blue Calcite
Calcium Carbonate (CaCO3)
Honey Calcite
Calcium Carbonate (CaCO3)
Rounded limestone pebble
Calcite-rich limestone (CaCO₃)
White Marble
Metamorphosed Limestone (principally CaCO3)
Greenstone with Epidote or Quartz veins
Metabasalt (Greenstone facies)
Yellow Calcite
Calcium Carbonate (CaCO3)
Dyed Quartz Geode
Silicon Dioxide (SiO2) with artificial pigment
Weathered limestone fragment
Calcite-rich limestone, chiefly calcium carbonate (CaCO₃)
Chert (Flint)
Microcrystalline Quartz (SiO2)
Chert (Flint)
Microcrystalline Quartz or Cryptocrystalline Silica (SiO2)
Orange Calcite
Calcium Carbonate (CaCO3)
Orange Calcite
Calcium Carbonate (CaCO3)