Rock Identifier

Category

Mineral (Processed Alloy)

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

Tiger's Eye (SiO2 (Quartz pseudomorph after crocidolite)) — mineral

Tiger's Eye

SiO2 (Quartz pseudomorph after crocidolite)

Pink Feldspar / Rhodochrosite (Tumbled Pink Quartzite) (SiO2 (Quartz) / KAlSi3O8 (Potassium Feldspar)) — mineral

Pink Feldspar / Rhodochrosite (Tumbled Pink Quartzite)

SiO2 (Quartz) / KAlSi3O8 (Potassium Feldspar)

Green Aventurine (Quartz (SiO2) with fuchsite inclusions) — mineral

Green Aventurine

Quartz (SiO2) with fuchsite inclusions

Dyed Chalcedony (Agate) (Silicon Dioxide (SiO2)) — mineral

Dyed Chalcedony (Agate)

Silicon Dioxide (SiO2)

Yellow Quartz (Citrine/Yellow Jasper) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Citrine/Yellow Jasper)

Silicon Dioxide (SiO2)

Mica Schist (Schist (Crystalline metamorphic rock)) — metamorphic

Mica Schist

Schist (Crystalline metamorphic rock)

Granite (Phaneritic intrusive felsic igneous rock) — igneous

Granite

Phaneritic intrusive felsic igneous rock

Unidentified small stone fragments (Indeterminate; the image does not show enough detail to identify a mineral or rock species) — mineral

Unidentified small stone fragments

Indeterminate; the image does not show enough detail to identify a mineral or rock species

Possible polished or tumbled stone (Unidentified; the image does not show enough detail to determine its composition) — mineral

Possible polished or tumbled stone

Unidentified; the image does not show enough detail to determine its composition

Lapis Lazuli (Lapis Lazuli (Rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)) — metamorphic

Lapis Lazuli

Lapis Lazuli (Rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)

Fossilized Shark Tooth (Chondrichthyes (Class) fossil) — fossil

Fossilized Shark Tooth

Chondrichthyes (Class) fossil

Weathered basalt cobble (Basalt, a fine-grained mafic volcanic rock) — igneous

Weathered basalt cobble

Basalt, a fine-grained mafic volcanic rock

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood (Silicified wood (primarily SiO2)) — sedimentary

Petrified Wood

Silicified wood (primarily SiO2)

Gray rock (possibly basalt or fine-grained granite) (Undetermined; no diagnostic minerals are visible) — igneous

Gray rock (possibly basalt or fine-grained granite)

Undetermined; no diagnostic minerals are visible

Seashell Fragment (Aragonite/Calcite) (Calcium Carbonate (CaCO3) - Shell fragment) — sedimentary

Seashell Fragment (Aragonite/Calcite)

Calcium Carbonate (CaCO3) - Shell fragment

River Rock (Polished Siliceous Rock / Quartzite Pebble) — sedimentary

River Rock

Polished Siliceous Rock / Quartzite Pebble

Dendritic Agate (Silicon Dioxide with Manganese or Iron Oxide inclusions (SiO2)) — sedimentary

Dendritic Agate

Silicon Dioxide with Manganese or Iron Oxide inclusions (SiO2)

Ironstone Concretion (Moqui Marble type) (Ferruginous Concretion (Fe2O3 / FeO(OH))) — sedimentary

Ironstone Concretion (Moqui Marble type)

Ferruginous Concretion (Fe2O3 / FeO(OH))

Tiger's Eye (Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of Iron Oxide)) — mineral

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of Iron Oxide)

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Likely a small rough mineral specimen (Unidentifiable from the image; possibly a mica-bearing rock or green mineral) — mineral

Likely a small rough mineral specimen

Unidentifiable from the image; possibly a mica-bearing rock or green mineral

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Aquamarine (Beryl (Be3Al2(SiO3)6)) — gemstone

Aquamarine

Beryl (Be3Al2(SiO3)6)

Quartz with Pyrite inclusions (Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)) — mineral

Quartz with Pyrite inclusions

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)

Magnetite (Iron Ore) (Magnetite (Fe3O4)) — mineral

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Fossilized Shark Tooth (Chondrichthyes (Class)) — fossil

Fossilized Shark Tooth

Chondrichthyes (Class)

Fossil Shell (Bivalve) (Class Bivalvia (fossilized)) — fossil

Fossil Shell (Bivalve)

Class Bivalvia (fossilized)

Gold Ore (Gold-bearing Quartz (Native Gold, Au)) — mineral

Gold Ore

Gold-bearing Quartz (Native Gold, Au)

Jasper and Chalcedony (Silicon Dioxide (SiO2) microcrystalline quartz) — sedimentary

Jasper and Chalcedony

Silicon Dioxide (SiO2) microcrystalline quartz

Petrified Wood (Silicified Wood (SiO2)) — mineral

Petrified Wood

Silicified Wood (SiO2)

Jasper (Banded Jasper / Chert) (Silicon Dioxide (SiO2 with iron oxide inclusions)) — sedimentary

Jasper (Banded Jasper / Chert)

Silicon Dioxide (SiO2 with iron oxide inclusions)

Mixed polished/tumbled stones; likely blue calcite, red carnelian, and gray/blue quartz or agate (Probable calcite (CaCO₃), chalcedony/quartz (SiO₂), and iron-colored chalcedony) — mineral

Mixed polished/tumbled stones; likely blue calcite, red carnelian, and gray/blue quartz or agate

Probable calcite (CaCO₃), chalcedony/quartz (SiO₂), and iron-colored chalcedony

Tiger's Eye (Pseudomorph of Quartz after Crocidolite (SiO2)) — mineral

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Mica Schist (Mica Schist (contains Muscovite KAl2(AlSi3O10)(OH)2)) — metamorphic

Mica Schist

Mica Schist (contains Muscovite KAl2(AlSi3O10)(OH)2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Shark Tooth Fossil (Carcharocles megalodon or similar fossilized shark tooth) — fossil

Shark Tooth Fossil

Carcharocles megalodon or similar fossilized shark tooth

Pyrite (Fool's Gold) (Iron Disulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Tiger's Eye (Pseudomorph of Quartz after Crocidolite (SiO2)) — metamorphic

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Purple Aventurine (Quartzite with Lepidolite (SiO2 + K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)) — metamorphic

Purple Aventurine

Quartzite with Lepidolite (SiO2 + K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Specular Hematite (Specularite) (Iron(III) oxide (Fe2O3)) — mineral

Specular Hematite (Specularite)

Iron(III) oxide (Fe2O3)

Marble (Recrystallized Calcite (CaCO3) Rock) — metamorphic

Marble

Recrystallized Calcite (CaCO3) Rock