Vesicular Basalt / Scoria pebble
Extrusive igneous rock with amygdaloidal infilling
igneous
Category
Mineral
Browse mineral specimens identified by the Rock Identifier community.
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Potassium Feldspar
Orthoclase (KAlSi3O8)
mineral
Pink Feldspar (Orthoclase)
Orthoclase Feldspar (KAlSi3O8)
mineral
Geode half
Geode (often quartz/chalcedony based)
sedimentary or igneous
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Hemimorphite
Hemimorphite (Zn4Si2O7(OH)2·H2O)
mineral
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Blue Apatite
Ca5(PO4)3(F,Cl,OH)
mineral
Sedimentary Sandstone with Iron Oxide
Ferruginous Sandstone
sedimentary
Shark Tooth Fossil
Chondrichthyes (class) fossilized tooth
fossil
Pyrite
Iron Sulfide (FeS2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Chrysocolla on Matrix
Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)
mineral
Gneiss
Gneiss
metamorphic
Quartz Mineral
Silicon Dioxide (SiO2)
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
Amethyst
Quartz (Silicon Dioxide, SiO2)
gemstone
Satin Spar (Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Limonite / Ironstone
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Unidentified dark mineral/rock fragment
Indeterminate; appearance may fit a sulfide-bearing rock or iron-rich mineral
mineral
Rainbow Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Quartz–feldspar pegmatite mineral specimen
Quartz (SiO₂) with potassium feldspar, albite, mica, and likely garnet or tourmaline
igneous
Unknown Rock Fragment
Unknown
unknown
Fluorite and Mineral Collection
Calcium Fluoride (CaF2)
mineral
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Drill Core Samples (Varied Lithology)
Multi-lithological core samples (containing potential granite, marble, and phyllite/schist sequence)
igneous, sedimentary, and metamorphic
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Native Copper
Copper (Cu)
mineral
Yellow Ochre / Limonite
Hydrated ferric oxide (FeO(OH)·nH2O)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Sandstone
SiO2 (predominantly quartz sand)
sedimentary
Copper Ore Specimen
Cupriferous Rock / Malachite-bearing ore
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
Tumbled quartz-rich pebble (likely quartzite or vein quartz)
Quartz (SiO₂), possibly quartzite with minor iron-oxide staining
metamorphic
Unidentified dark metallic sulfide specimen
Possibly pyrite-, chalcopyrite-, or galena-bearing ore; exact identification requires testing
mineral
Quartz with Associated Minerals
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (Metamorphic Rock)
metamorphic