Rock Identifier

Category

Mineral (Processed Alloy)

Browse mineral (processed alloy) specimens identified by the Rock Identifier community.

Milky Quartz with Chlorite/Mica inclusions (Silicon Dioxide (SiO2) with inclusions) — mineral

Milky Quartz with Chlorite/Mica inclusions

Silicon Dioxide (SiO2) with inclusions

Cubic Zirconia (Diamond Simulant) (Zirconium Dioxide (ZrO2)) — mineral

Cubic Zirconia (Diamond Simulant)

Zirconium Dioxide (ZrO2)

Banded Agate (specifically Moss or River Agate variety) (Cryptocrystalline Quartz (SiO2)) — mineral

Banded Agate (specifically Moss or River Agate variety)

Cryptocrystalline Quartz (SiO2)

Quartz (Iron-stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Ferruginous Quartz (Iron-stained Quartz) (Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions) — mineral

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Specular Hematite (Specularite) (Hematite (Alpha-Fe2O3)) — mineral

Specular Hematite (Specularite)

Hematite (Alpha-Fe2O3)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Green Calcite (Calcium Carbonate (CaCO3)) — mineral

Green Calcite

Calcium Carbonate (CaCO3)

Silicon Carbide (Carborundum) (Silicon Carbide (SiC)) — mineral

Silicon Carbide (Carborundum)

Silicon Carbide (SiC)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Anthracite Coal (Anthracite (Carbon-rich metamorphic coal)) — sedimentary

Anthracite Coal

Anthracite (Carbon-rich metamorphic coal)

River Pebble (Polished Rock Fragment) — sedimentary

River Pebble

Polished Rock Fragment

Likely slag or metallic industrial byproduct (Unidentified iron-rich ferrous slag; possibly magnetite-bearing slag) — mineral

Likely slag or metallic industrial byproduct

Unidentified iron-rich ferrous slag; possibly magnetite-bearing slag

Milky Quartz with Iron Staining (Silicon Dioxide (SiO2)) — mineral

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Calcite (Calcite (Mineral; CaCO₃)) — Mineral

Calcite

Calcite (Mineral; CaCO₃)

Lapis Lazuli (Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)) — metamorphic

Lapis Lazuli

Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Prehnite (Prehnite - Ca2Al(AlSi3O10)(OH)2) — mineral

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2

Quartz Vein in Host Rock (Silicon Dioxide (SiO2) within Sedimentary or Igneous Matrix) — igneous

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Sedimentary or Igneous Matrix

Tiger's Eye (Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)) — metamorphic

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)

Peridot (Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4) — mineral

Peridot

Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4

Porphyritic Basalt with K-Feldspar Phenocryst (Porphyritic Basic Igneous Rock (with Potassium Feldspar)) — igneous

Porphyritic Basalt with K-Feldspar Phenocryst

Porphyritic Basic Igneous Rock (with Potassium Feldspar)

White Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

White Quartz Pebble

Silicon Dioxide (SiO2)

Megalodon Shark Tooth (Otodus megalodon) — fossil

Megalodon Shark Tooth

Otodus megalodon

Quartz Vein in Basalt or Mafic Rock (Silicon Dioxide (SiO2) vein in volcanic/mafic matrix) — igneous

Quartz Vein in Basalt or Mafic Rock

Silicon Dioxide (SiO2) vein in volcanic/mafic matrix

Opalite crescent pendant (Opalite (man-made opalescent glass; not a natural mineral)) — gemstone

Opalite crescent pendant

Opalite (man-made opalescent glass; not a natural mineral)

Chert Nodule / Flint (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Nodule / Flint

Microcrystalline Quartz (SiO2)

Petrified Wood (Silicified Wood (SiO2 permineralization)) — fossil

Petrified Wood

Silicified Wood (SiO2 permineralization)

Bivalve Fossil (Clam) (Class Bivalvia (Mollusca)) — fossil

Bivalve Fossil (Clam)

Class Bivalvia (Mollusca)

Hag Stone (Natural Perforated Flint or Chert (SiO2)) — sedimentary

Hag Stone

Natural Perforated Flint or Chert (SiO2)

Sandstone (River Cobble) (Clastic Sandstone (SiO2 with accessory minerals)) — sedimentary

Sandstone (River Cobble)

Clastic Sandstone (SiO2 with accessory minerals)

Fossil Shark Tooth (Lamniform (Mackerel Shark) fossil tooth, likely Otodus or Cretalamna) — fossil

Fossil Shark Tooth

Lamniform (Mackerel Shark) fossil tooth, likely Otodus or Cretalamna

Red Sandstone (Ferruginous Sandstone (formula varies, primarily SiO2 with Fe2O3)) — sedimentary

Red Sandstone

Ferruginous Sandstone (formula varies, primarily SiO2 with Fe2O3)

Asphalt (Road Aggregate) (Bituminous Conglomerate / Asphalt Concrete) — Anthropogenic (Man-made)

Asphalt (Road Aggregate)

Bituminous Conglomerate / Asphalt Concrete

Anthropogenic (Man-made)

Ferruginous Quartz (River Pebble) (Silicon Dioxide (SiO2) with Iron Oxide inclusions) — sedimentary (secondary classification for a weathered mineral specimen)

Ferruginous Quartz (River Pebble)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

sedimentary (secondary classification for a weathered mineral specimen)

Sandstone (Clastic Sedimentary Rock (composed mostly of SiO2)) — sedimentary

Sandstone

Clastic Sedimentary Rock (composed mostly of SiO2)

Red Sandstone (Arenite (primarily Quartz with Iron Oxide)) — sedimentary

Red Sandstone

Arenite (primarily Quartz with Iron Oxide)

Red Jasper (Silicon Dioxide (SiO2) with Iron inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Iron inclusions

Tree Agate (Silicon Dioxide (SiO2) - Dendritic Agate/Chalcedony) — sedimentary

Tree Agate

Silicon Dioxide (SiO2) - Dendritic Agate/Chalcedony

Blue Aventurine (Silicon Dioxide (SiO2) with inclusions of Dumortierite) — Mineral (silicate variety)

Blue Aventurine

Silicon Dioxide (SiO2) with inclusions of Dumortierite

Mineral (silicate variety)

Yellow Jasper (Jasper (Silicon Dioxide, SiO2)) — sedimentary

Yellow Jasper

Jasper (Silicon Dioxide, SiO2)

Biotite Schist (Schist (Biotite-dominated)) — metamorphic

Biotite Schist

Schist (Biotite-dominated)