Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Category
Mineral (Biogenic)
Browse mineral (biogenic) specimens identified by the Rock Identifier community.
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Chrysocolla and Malachite Beads
Hydrated copper silicates (Chrysocolla) and Copper carbonate hydroxide (Malachite)
mineral
Yooperlite (Sodalite-bearing Syenite)
Sodalite-rich Syenite
igneous
Hemimorphite
Hemimorphite (Zn4Si2O7(OH)2·H2O)
mineral
Blue Apatite
Ca5(PO4)3(F,Cl,OH)
mineral
Unidentified dark mineral/rock fragment
Indeterminate; appearance may fit a sulfide-bearing rock or iron-rich mineral
mineral
Fossil bone, possibly a large mammal long-bone fragment
Fossilized cortical bone; taxon indeterminate from the photograph
fossil
Shark Tooth Fossil
Vertebrate fossilized tooth (various genera such as Carcharodon, Otodus, or Negaprion)
fossil
Granite
Phaneritic Plutonic Felsic Rock
igneous
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Fluorite and Mineral Collection
Calcium Fluoride (CaF2)
mineral
Quartz with Associated Minerals
Silicon Dioxide (SiO2)
mineral
Sedimentary Sandstone with Iron Oxide
Ferruginous Sandstone
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Chrysocolla on Matrix
Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)
mineral
Sandstone
SiO2 (predominantly quartz sand)
sedimentary
Gneiss
Gneiss
metamorphic
Quartz with Mineral Inclusions
Silicon Dioxide (SiO2)
mineral
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Copper Ore Specimen
Cupriferous Rock / Malachite-bearing ore
mineral
Schist
Schist (various mineralogical compositions including mica, chlorite, talc, etc.)
Metamorphic
Banded Gneiss (Variety of Gneiss)
Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)
Metamorphic Rock
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral
Orthoclase Feldspar (Potassium Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Fossilized Gastropod / Coral
Phylum Mollusca / Cnidaria (Silicified or Calcified)
fossil
Rainbow Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Unidentified dark metallic sulfide specimen
Possibly pyrite-, chalcopyrite-, or galena-bearing ore; exact identification requires testing
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Amethyst
Quartz (Silicon Dioxide, SiO2)
gemstone
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Satin Spar (Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Limonite / Ironstone
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Unknown Rock Fragment
Unknown
unknown
Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Magnetite
Fe3O4 (Iron(II,III) oxide)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Microcline Feldspar (Amazonite or White Feldspar)
KAlSi3O8
mineral
Native Copper
Copper (Cu)
mineral
Yellow Ochre / Limonite
Hydrated ferric oxide (FeO(OH)·nH2O)
mineral
Drill Core Samples (Varied Lithology)
Multi-lithological core samples (containing potential granite, marble, and phyllite/schist sequence)
igneous, sedimentary, and metamorphic
Granite
Granite (composed of Quartz, Feldspar, and Mica)
igneous