Pyrite
Pyrite (Iron Disulfide), FeS2
Mineral
Category
Anthropogenic (Man Made Industrial Deposit)
Browse anthropogenic (man made industrial deposit) specimens identified by the Rock Identifier community.
Diamond
Diamond (Carbon, C)
mineral
Garnet (Red Garnet)
Garnet Group. The red varieties seen in jewelry are typically Almandine (Fe3Al2(SiO4)3), Pyrope (Mg3Al2(SiO4)3), or a mix of the two (pyrope-almandine series).
Mineral (specifically, a variety of the mineral species Pyrope-Almandine Garnet)
Agate
Chalcedony (cryptocrystalline quartz)
Mineral
Citrine
Quartz (SiO₂)
mineral
Jasper (yellow/cream variety)
SiO₂ (Cryptocrystalline Quartz)
Sedimentary
Anthracite Coal
Anthracite (a form of coal, primarily carbon)
sedimentary
Diamond
Diamond (a metastable allotrope of carbon, C)
Mineral
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
Mineral
Agate
Agate (a cryptocrystalline variety of Quartz, SiO₂)
Mineral
Fluorite (likely)
Calcium Fluoride (CaF2)
Mineral
Chert
Chert (microcrystalline quartz, SiO2)
Sedimentary
Pegmatite (likely Granitic Pegmatite)
Pegmatite (a coarse-grained igneous rock, often with granitic composition)
igneous
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(OH)₄(BO₃)₃Si₆O₁₈)
mineral
Biotite Mica
K(Mg,Fe)3AlSi3O10(OH)2
Mineral in a matrix (likely quartz or feldspar)
Black Tourmaline (Schorl)
Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
mineral
Marble
Marble (primarily Calcite, CaCO3 or Dolomite, CaMg(CO3)2)
Metamorphic Rock
Chert (or possibly Flint)
SiO2 (Silicon Dioxide)
Sedimentary Rock
Peridot (Olivine)
Olivine ((Mg,Fe)2SiO4)
Mineral
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
River Pebble (Likely Chert or Fine-Grained Sandstone/Quartzite)
Siliciclastic clast (likely Chert or Quartzarenite/Quartzite pebble)
Sedimentary
Chert (Jasper-like)
SiO2 (Cryptocrystalline Quartz)
Sedimentary
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
Banded Iron Formation
Banded Iron Formation (BIF)
Sedimentary
Banded Agate (likely Carnelian Agate or Sardonyx)
Agate is a common name for a microcrystalline variety of Quartz (SiO₂), specifically a form of Chalcedony.
Sedimentary Rock (technically a variety of Chalcedony)
Aragonite (variety 'Flos Ferri')
Aragonite (CaCO3)
Mineral
Black Tourmaline
Schorl (Na(Fe2+)_{3}Al_{6} (BO_{3})_{3} (Si_{6}O_{18})(OH)_{4})
Mineral
Chalcedony
Chalcedony (SiO₂)
Mineral
Quartz with Iron Stains
Quartz (SiO2) with iron oxide/hydroxide staining
Mineral
Apatite
Apatite Group (e.g., Fluorapatite Ca5(PO4)3F, Chlorapatite Ca5(PO4)3Cl, Hydroxylapatite Ca5(PO4)3(OH))
mineral
Diamond (Rough)
Diamond (C)
Mineral
Soapstone
Steatite (primarily composed of Talc, Mg₃Si₄O₁₀(OH)₂)
Metamorphic Rock
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
Mineral
Peridot (likely, given the color and bead form)
Olivine, variety Peridot (Mg,Fe)2SiO4
Mineral
Sodalite
Sodalite (Sodium Aluminum Silicate Chloride), Na8(Al6Si6O24)Cl2
Mineral
Pyrite
Pyrite (Iron sulfide, FeS₂)
mineral
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
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.
Industrial Diamond (Bort or Boart)
Diamond (pure Carbon, C)
mineral
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
Mineral
Pink Quartz (Inclusion-filled)
Silicon Dioxide (SiO2)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral