Shark Tooth Fossil
Chondrichthyes (class) fossilized tooth
fossil
Category
Mineral Health
Browse mineral health specimens identified by the Rock Identifier community.
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Chrysocolla on Matrix
Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)
mineral
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Gneiss
Gneiss
metamorphic
Rainbow Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Native Copper
Copper (Cu)
mineral
Yellow Ochre / Limonite
Hydrated ferric oxide (FeO(OH)·nH2O)
mineral
Likely garnet-bearing rock (possibly almandine garnet in matrix)
Garnet, likely almandine (Fe₃Al₂Si₃O₁₂); host rock cannot be determined from the image
metamorphic
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Gypsum (Selenite sand)
Calcium sulfate dihydrate (CaSO4·2H2O)
mineral
Unknown Rock Fragment
Unknown
unknown
Banded gneiss pebble
Feldspar–quartz gneiss; exact mineral composition cannot be confirmed from the image
metamorphic
Drill Core Samples (Varied Lithology)
Multi-lithological core samples (containing potential granite, marble, and phyllite/schist sequence)
igneous, sedimentary, and metamorphic
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Rainbow Fluorite
Calcium Fluoride (CaF2)
mineral
Chlorite-rich schist (probable greenschist)
Greenschist-facies metabasalt or chlorite–actinolite schist
metamorphic
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
Green-and-white rough mineral specimen, possibly amazonite
Unconfirmed; possible amazonite, a green variety of microcline feldspar (KAlSi₃O₈)
mineral
Pink-orange mineral fragment, likely feldspar (possibly potassium feldspar)
Likely orthoclase or microcline, KAlSi₃O₈; identification from the image is uncertain
mineral
Green serpentine (likely serpentinite)
Serpentine-group minerals, commonly antigorite, lizardite, and/or chrysotile; rock name: serpentinite
metamorphic
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Iron-rich rock fragment (possibly ironstone or limonite/goethite)
Likely ironstone composed largely of goethite/limonite; image alone cannot confirm
sedimentary
Granite
Granite
Igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Unidentified dark metallic sulfide specimen
Possibly pyrite-, chalcopyrite-, or galena-bearing ore; exact identification requires testing
mineral
Copper Ore Specimen
Cupriferous Rock / Malachite-bearing ore
mineral
Fluorite and Mineral Collection
Calcium Fluoride (CaF2)
mineral
Likely serpentine-rich rock (serpentinite)
Serpentinite, composed mainly of serpentine-group minerals (e.g., lizardite, antigorite, or chrysotile); exact identification is uncertain from the image alone
metamorphic
Unidentified dark mineral/rock fragment
Indeterminate; appearance may fit a sulfide-bearing rock or iron-rich mineral
mineral
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Tumbled quartz-rich pebble (likely quartzite or vein quartz)
Quartz (SiO₂), possibly quartzite with minor iron-oxide staining
metamorphic
Granite
Granite (composed of Quartz, Feldspar, and Mica)
igneous
Magnetite (Lodestone)
Iron(II,III) oxide (Fe3O4)
mineral
Carved serpentine pendant
Serpentine-group minerals, commonly antigorite/lizardite (Mg₃Si₂O₅(OH)₄), possibly mixed with chlorite or other inclusions
mineral
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral
Orthoclase Feldspar (Potassium Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Iron-oxide-stained rock with a pale mineral vein
Likely limonite/goethite-stained quartz-bearing rock; exact identification is uncertain from the image
sedimentary
Sandstone
SiO2 (predominantly quartz sand)
sedimentary
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Ruby (Raw Corundum)
Al2O3 (Aluminum Oxide)
mineral