Psilomelane (Black Hematite/Manganese Ore)
Barium Manganese Oxide (Formula: BaMn9O18(OH)4)
mineral
Category
Sedimentary (Primary) With Artificial Modification
Browse sedimentary (primary) with artificial modification specimens identified by the Rock Identifier community.
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Fluorite (Rainbow Fluorite)
Calcium Fluoride (CaF2)
mineral
Red Jasper (Opaque Chalcedony)
Jasper / Silicon Dioxide (SiO2) with Ferric Iron inclusions
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Bog Iron / Limonite Concretion
Goethite/Limonite mixture (FeO(OH)·nH2O)
sedimentary
Chert (Tan/Grey variety)
Silicon Dioxide (SiO2)
sedimentary
Banded Iron Formation (Jasper-Hematite)
Banded Iron Formation (BIF); composition primarily Hematite (Fe2O3) and Chalcedony/Quartz (SiO2)
sedimentary
Banded Iron Formation (BIF)
Banded Iron Formation (predominantly Hematite, Magnetite, and Chert/Quartz)
sedimentary
Banded Iron Formation (Jaspillite)
Banded Iron Formation (BIF)
sedimentary
Banded Iron Formation (Red Jasper and Hematite Chert)
Banded Iron Formation (BIF); Fe2O3 (Hematite) + SiO2 (Quartz/Jasper)
sedimentary
Bauxite
Bauxite (mixture of Gibbiste Al(OH)3, Boehmite ̳-AlO(OH), and Diaspore ́-AlO(OH))
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
Mineral
Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Barite
Barium Sulfate (BaSO4)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Agate (specifically, multi-colored or pastel-dyed agate)
Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).
Mineral
Carved Mottled Greenish-Yellow Crystal/Glass Object
Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.
Man-made Object/Uncertain Mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Amethyst and Hematite Bracelet
Amethyst (SiO2) and Hematite (Fe2O3)
mineral
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Banded Iron Formation
Banded Iron Formation (BIF)
sedimentary
Bauxite
Bauxite (Principal ore of aluminum; mixture of minerals including Gibbsite Al(OH)3, Boehmite and Diaspore AlO(OH))
sedimentary
Laterite
Lateritic Soil/Rock (rich in Fe2O3 and Al2O3)
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral
Magnetite / Ironstone
Iron(II,III) oxide (Fe3O4)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Rough Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Mookaite Jasper
Silicon Dioxide (SiO2) - Radiolarite
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (SiO2 + Fe2O3)
sedimentary
Limestone
Calcium carbonate ( преимущественно CaCO3)
sedimentary
Crushed Stone (Gravel/Aggregates)
Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)
sedimentary and igneous (mixed)
Celestite (Celectine)
Strontium sulfate (SrSO4)
mineral
Schist/Phyllite
Metamorphic Schist (Chlorite Schist variety)
metamorphic
Vanadinite
Vanadinite (Pb5(VO4)3Cl)
mineral
Celestine (or Celestite)
Celestine (Strontium Sulfate, SrSO4)
mineral
Banded Flint / Chert
Silicon Dioxide (SiO2)
sedimentary
Chert (Arrowhead Fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (specifically Black Chert or Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Limonite and Goethite (Ironstone)
Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)
sedimentary
Red Sandstone (Siltstone/Mudstone variety)
Ferruginous Sandstone (composed primarily of Quartz with Hematite cementation)
sedimentary
Sandstone
Arenite (SiO2 based with primary clasts 0.0625 to 2 mm)
sedimentary