Native Copper
Copper (Cu)
mineral
Category
Sedimentary (Secondary Mineral Formation)
Browse sedimentary (secondary mineral formation) specimens identified by the Rock Identifier community.
Learn about Sedimentary (Secondary Mineral Formation) in the encyclopedia
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Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Limonite
FeO(OH)·nH2O
mineral
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Fossil Shell
Invertebrate fossil (Mollusca)
fossil
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Dendritic Agate (Blue Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chrysocolla on Quartz
Chrysocolla (Cu2−xAlx(H2−xSi2O5)(OH)4·nH2O) often associated with Quartz (SiO2)
mineral
Lepidolite (likely)
K(Li,Al)3(Al,Si)4O10(F,OH)2 (Phyllosilicate mineral, part of the mica group)
Mineral
White Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Unidentified small rounded mineral/rock fragment
Indeterminate from image; possibly quartz or chalcedony with iron-oxide staining
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Earthy Hematite (Iron Ore)
Iron(III) oxide (Fe2O3)
mineral
Turquoise ring (likely stabilized or imitation turquoise)
Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; exact material is uncertain from the image
gemstone
Specular Hematite with Quartz and Limonite
Hematite (Fe2O3) with Quartz (SiO2) and Limonite (FeO(OH)·nH2O)
Mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble with Chert
Silicon Dioxide (SiO2)
mineral
Quartz on Sandstone
Silicon Dioxide (SiO2) in Lithic Sandstone
sedimentary
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Banded Sedimentary Rock
Sedimentary rock with Liesegang banding
sedimentary
Quartz Veined Mudstone
Metasedimentary rock with Quartz (SiO2) veins
metamorphic
Vesicular Basalt
Basalt (Mafic Extrusive Volcanic Rock)
igneous
Limonite with Pyrite
Hydrated Iron Oxide Hydroxide, FeO(OH)·nH2O
mineral
Polished black stone, likely hematite or black jasper
Hematite (Fe₂O₃) or opaque chalcedony/jasper (SiO₂); image-only identification is uncertain
mineral
Pink Granite
Plagioclase-Quartz-K-Feldspar Granite
igneous
Limonite
Limonite (FeOO·nH2O)
mineral
Sandstone with Liesegang Rings
Arenite with secondary Iron oxide (Limonite/Goethite) precipitation
sedimentary
Limonite (Iron Ore Congcretion)
Limonite (a mixture of hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)
mineral
Botryoidal Hematite (included in Quartz/Limonite matrix)
Fe2O3 (Hematite) on Quartz (SiO2) / Limonite
mineral
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Agate (Banded Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite inclusions
mineral
Golden Calcite
Calcium Carbonate (CaCO3)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz Geode in Sedimentary Host Rock
Silicon Dioxide (SiO2) in Carbonate Matrix
sedimentary