Rock Identifier

Category

Mineral, Sediment

Browse mineral, sediment specimens identified by the Rock Identifier community.

Quartz (Riverstone / Cobble) (Silicon Dioxide (SiO2)) — mineral

Quartz (Riverstone / Cobble)

Silicon Dioxide (SiO2)

mineral
Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

metamorphic
Schist (Mica Schist) — metamorphic

Schist

Mica Schist

metamorphic
Aventurine (likely Green Aventurine) (Quartz (SiO2) with included minerals (Fuchsite or Chlorite for green color)) — Mineral

Aventurine (likely Green Aventurine)

Quartz (SiO2) with included minerals (Fuchsite or Chlorite for green color)

Mineral
Chakra Stone Bracelet (mixed gemstones) (Multi-mineral/Gemstone assembly (primarily Quartz variety beads)) — mineral

Chakra Stone Bracelet (mixed gemstones)

Multi-mineral/Gemstone assembly (primarily Quartz variety beads)

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

Ferruginous Quartz

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

mineral
Limonite (Iron Ore) (Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O)) — Mineral

Limonite (Iron Ore)

Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O)

Mineral
Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

metamorphic
Serpentinite (often containing Jadeite/Nephrite) (Antigorite-rich Serpentine Rock, (Mg, Fe)3Si2O5(OH)4) — metamorphic

Serpentinite (often containing Jadeite/Nephrite)

Antigorite-rich Serpentine Rock, (Mg, Fe)3Si2O5(OH)4

metamorphic
Chert Pebble (Jasper/Quartz variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Pebble (Jasper/Quartz variety)

Microcrystalline Quartz (SiO2)

sedimentary
Granite (Phaneritic Felsic Igneous Rock) — igneous

Granite

Phaneritic Felsic Igneous Rock

igneous
Schist (Mica Schist) — metamorphic

Schist

Mica Schist

metamorphic
Basalt (Amygdaloidal) (Amygdaloidal Basalt) — igneous

Basalt (Amygdaloidal)

Amygdaloidal Basalt

igneous
Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Moonstone (bead form) (Potassium Aluminum Silicate (KAlSi3O8) - a variety of Orthoclase Feldspar) — Mineral

Moonstone (bead form)

Potassium Aluminum Silicate (KAlSi3O8) - a variety of Orthoclase Feldspar

Mineral
Fluorite in Matrix (Fluorite (CaF2) within a host rock matrix) — Mineral

Fluorite in Matrix

Fluorite (CaF2) within a host rock matrix

Mineral
Vesicular Basalt (Amygdaloidal) (Amygdaloidal Basalt (Mafic volcanic rock)) — igneous

Vesicular Basalt (Amygdaloidal)

Amygdaloidal Basalt (Mafic volcanic rock)

igneous
Sandstone (with Liesegang rings or joints) (Clastic Sedimentary Rock (primarily Quartz with Iron Oxide cement)) — sedimentary

Sandstone (with Liesegang rings or joints)

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide cement)

sedimentary
Rugose Coral (Horn Coral) (Order Rugosa (extinct fossilized coral)) — sedimentary

Rugose Coral (Horn Coral)

Order Rugosa (extinct fossilized coral)

sedimentary
Piddock bored rock (likely Mudstone or Shale) (Ichnofossil (Gastrochaenolites borings) in Fine-grained Sedimentary Rock) — sedimentary

Piddock bored rock (likely Mudstone or Shale)

Ichnofossil (Gastrochaenolites borings) in Fine-grained Sedimentary Rock

sedimentary
Sandstone (Arenite (SiO2 predominantly)) — sedimentary

Sandstone

Arenite (SiO2 predominantly)

sedimentary
Pink Satin Spar (Satin Spar Selenite Dyed) (Gypsum (CaSO4·2H2O)) — mineral

Pink Satin Spar (Satin Spar Selenite Dyed)

Gypsum (CaSO4·2H2O)

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

Hematite

Iron(III) oxide (Fe2O3)

mineral
Banded Gneiss (Gneiss (pronounced "nice")) — metamorphic

Banded Gneiss

Gneiss (pronounced "nice")

metamorphic
Selenite (Satin Spar) (Gypsum (CaSO4·2H2O)) — mineral

Selenite (Satin Spar)

Gypsum (CaSO4·2H2O)

mineral
Pyrite (Iron Pyrite (FeS2)) — mineral

Pyrite

Iron Pyrite (FeS2)

mineral
Moonstone (Feldspar) (Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8)) — mineral

Moonstone (Feldspar)

Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8)

mineral
Pink Granite (Phaneritic Felsic Igneous Rock) — igneous

Pink Granite

Phaneritic Felsic Igneous Rock

igneous
Greenschist (Greenstone) (Chlorite schist (primarily Chlorite-Epidote-Actinolite-Albite)) — metamorphic

Greenschist (Greenstone)

Chlorite schist (primarily Chlorite-Epidote-Actinolite-Albite)

metamorphic
Granite / Gneiss Complex (Felsic Plutonic Rock (Granite) or High-grade Metamorphic Rock (Gneiss)) — igneous/metamorphic

Granite / Gneiss Complex

Felsic Plutonic Rock (Granite) or High-grade Metamorphic Rock (Gneiss)

igneous/metamorphic
Rutilated Quartz (Silicon Dioxide with Titanium Dioxide (SiO2 with TiO2 inclusions)) — mineral

Rutilated Quartz

Silicon Dioxide with Titanium Dioxide (SiO2 with TiO2 inclusions)

mineral
Basalt (Basalt (extrusive igneous rock)) — Igneous

Basalt

Basalt (extrusive igneous rock)

Igneous
Peach Aventurine (Quartz variety (SiO2 + Hematite/Goethite inclusions)) — mineral

Peach Aventurine

Quartz variety (SiO2 + Hematite/Goethite inclusions)

mineral
Pyromorphite on Epidote (Pyromorphite [Pb5(PO4)3Cl] and Epidote [Ca2(Al2,Fe3+)(SiO4)3(OH)]) — mineral

Pyromorphite on Epidote

Pyromorphite [Pb5(PO4)3Cl] and Epidote [Ca2(Al2,Fe3+)(SiO4)3(OH)]

mineral
Schist (Mica Schist) — metamorphic

Schist

Mica Schist

metamorphic
Granite (Granite (silica-rich intrusive igneous rock)) — igneous

Granite

Granite (silica-rich intrusive igneous rock)

igneous
Magnetite with Pyrite or Chalcopyrite inclusions (Magnetite (Fe3O4) with Pyrite (FeS2)) — mineral

Magnetite with Pyrite or Chalcopyrite inclusions

Magnetite (Fe3O4) with Pyrite (FeS2)

mineral
Chalcedony or Chert/Jasper with secondary mineral staining (SiO2 (for chalcedony/quartz) with possible secondary copper minerals (e.g., CuSiO3·nH2O for chrysocolla, Cu2(CO3)(OH)2 for malachite) or iron oxides/hydroxides.) — Mineral, potentially a rock with chalcedony/jasper.

Chalcedony or Chert/Jasper with secondary mineral staining

SiO2 (for chalcedony/quartz) with possible secondary copper minerals (e.g., CuSiO3·nH2O for chrysocolla, Cu2(CO3)(OH)2 for malachite) or iron oxides/hydroxides.

Mineral, potentially a rock with chalcedony/jasper.
Milky Quartz (Water-Worn Pebble) (Silicon Dioxide (SiO2)) — mineral

Milky Quartz (Water-Worn Pebble)

Silicon Dioxide (SiO2)

mineral
Greenschist (Greenschist (Chlorite Schist)) — metamorphic

Greenschist

Greenschist (Chlorite Schist)

metamorphic
Granite (Phaneritic plutonic rock (Quartz, Feldspar, Mica)) — igneous

Granite

Phaneritic plutonic rock (Quartz, Feldspar, Mica)

igneous
Granite (Granite (compositional mixture of Quartz, Feldspar, and Mica)) — igneous

Granite

Granite (compositional mixture of Quartz, Feldspar, and Mica)

igneous