Banded Gneiss
Gneiss (Felsic to Mafic Metamorphic Rock)
metamorphic
Category
Mineral Variant
Browse mineral variant specimens identified by the Rock Identifier community.
Learn about Mineral Variant in the encyclopedia
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Quartz with Sericite and Cinnabar
Silicon Dioxide (SiO2) with muscovite/sericite and mercury sulfide (HgS)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Orthoclase Feldspar with Quartz
Orthoclase (KAlSi3O8)
mineral
Vesicular Basalt / Scoria pebble
Extrusive igneous rock with amygdaloidal infilling
igneous
Synthetic Resin (Artificial Specimen)
Polyurethane or Polyester Resin
mineraloid (man-made)
Unidentified dark mineral/rock fragment
Indeterminate; appearance may fit a sulfide-bearing rock or iron-rich mineral
mineral
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Rainbow Fluorite
Calcium Fluoride (CaF2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Apatite
Fluorapatite, Chlorapatite, and Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Fluorite and Mineral Collection
Calcium Fluoride (CaF2)
mineral
Shark Tooth Fossil
Chondrichthyes (class) fossilized tooth
fossil
Apatite
Ca5(PO4)3(F,Cl,OH)
mineral
Quartz with Associated Minerals
Silicon Dioxide (SiO2)
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Geode half
Geode (often quartz/chalcedony based)
sedimentary or igneous
Granitic Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss with Quartz Veining
Gneiss (High-grade Metamorphic Rock)
metamorphic
Carved Sea Turtle Figurine (Aventurine / Quartz / Jasper)
Quartz variety (SiO2) / Polycrystalline Quartz Aggregate
mineral
Yooperlite (Sodalite-bearing Syenite)
Sodalite-rich Syenite
igneous
Blue Apatite
Ca5(PO4)3(F,Cl,OH)
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
Granite
Intrusive igneous rock
igneous
Gneiss
Gneiss
metamorphic
Hemimorphite
Hemimorphite (Zn4Si2O7(OH)2·H2O)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Chrysocolla and Malachite Beads
Hydrated copper silicates (Chrysocolla) and Copper carbonate hydroxide (Malachite)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Quartz with Mineral Inclusions
Silicon Dioxide (SiO2)
mineral
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Sandstone
SiO2 (predominantly quartz sand)
sedimentary
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
Copper Ore Specimen
Cupriferous Rock / Malachite-bearing ore
mineral
Chrysocolla on Matrix
Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)
mineral
Sedimentary Sandstone with Iron Oxide
Ferruginous Sandstone
sedimentary