Quartz Geode
Crystalline Silver Oxide (SiO2) in Calcareous Host
mineral
Category
Mineral (Evaporite)
Browse mineral (evaporite) specimens identified by the Rock Identifier community.
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Peacock Ore (Bornite or Chalcopyrite)
Bornite (Cu₅FeS₄) or iridescent Chalcopyrite (CuFeS₂)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Chlorite/Epidote inclusions
Silicon Dioxide (SiO2) with phyllosilicate/sorosilicate inclusions
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
River/Stream Pebble
Clast / Detrital Grain / Rounded Sedimentary Particle (Compositionally variable, commonly Quartz, Feldspar, Chert, or other resistant rock fragments)
Mineral, specifically a rock fragment
Schist
Schist (various compositions)
metamorphic
Sandstone (likely Quartzose Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Andesite Porphyry (Geological Drill Core)
Andesite Porphyry
igneous
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Quartz-bearing Ore (likely Gold-bearing Quartz)
Quartz (SiO2) with potential sulfide mineralization (Pyrite/Arsenopyrite)
mineral/hydrothermal
Garnet (Almandine/Pyrope series)
Silicate mineral (Almandine: Fe3Al2Si3O12; Pyrope: Mg3Al2Si3O12)
mineral
Sandstone
Sandstone (Silicon Dioxide, SiO2)
sedimentary
Gabbro (likely with Pyrite/Sulfide mineralization)
Mafic Intrusive Igneous Rock
igneous
Vesicular Basalt with Calcification
Vesicular Basalt (Aphanitic extrusive igneous rock)
igneous
Metallic Ornament / Jewelry
N/A - This is an artificial object, not a geological specimen.
This appears to be a man-made metallic object, likely jewelry, not a natural rock, mineral, or geological specimen.
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossilized Dinosaur Skull (Tyrannosaurus rex)
Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica
sedimentary
Dinosaur Fossil (Tyrannosaurus rex skull replica/specimen)
Tyrannosaurus rex (fossilized in permineralized sedimentary matrix)
sedimentary
Fossilized Shark Tooth
Fossilized elasmobranch tooth (Apatite/Calcium Phosphate)
sedimentary
Dendritic Limestone
Calcite with Manganese Oxide (Manganese Dendrites)
sedimentary
Opalite
Synthetic Opalite Glass (Silicon Dioxide)
mineraloid (man-made)
Conglomerate
Conglomerate (a clastic sedimentary rock)
Sedimentary Rock
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Chrysocolla in Matrix
Hydrated copper silicate - (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Fossil Coral
Fossilized Scleractinia or Tabulata (various genera/species)
Sedimentary
Greenschist
Greenschist (containing Chlorite, Epidote, and Actinolite)
metamorphic
Fossil Shark Tooth
Otodus sp. or Carcharocles sp. (likely fossilized Chondrichthyes)
fossil
Quartz with Chalcopyrite
Silicon Dioxide (SiO2) with Copper Iron Sulfide (CuFeS2)
mineral
Sandstone (likely Arkosic or Quartzose)
Arenite (SiO2 based with mineral inclusions)
sedimentary
Schist
Schist
Metamorphic
Quartz with mica and feldspar (Pegmatite fragment)
Granitic Pegmatite (composed mainly of SiO2 with KAlSi3O8)
igneous
Fossilized Shark Tooth
Carcharocles sp. or similar (Fossilized Fluorapatite)
sedimentary
Olivine (Peridot when gem-quality)
Olivine Group (Magnesium Iron Silicate, (Mg,Fe)2SiO4)
mineral
Schist
Schist
metamorphic
Fossilized Shark Tooth (Otodus)
Otodus obliquus
fossil
Halite
Sodium Chloride (NaCl)
Mineral
Precious Opal in Matrix
Hydrated Silica (SiO2·nH2O)
mineral
Milky Quartz with inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Garnet
Almandine Garnet (Fe3Al2(SiO4)3)
mineral
Granite
Granite (Phaneritic igneous rock)
igneous
Blue Kyanite
Kyanite (Al2SiO5)
metamorphic