Rock Identifier

Category

Mineralogical Specimen

Browse mineralogical specimen specimens identified by the Rock Identifier community.

Learn about Mineralogical Specimen in the encyclopedia

Emerald in Matrix

Emerald in Matrix

Morganite Crystal

Morganite Crystal

Aquamarine Matrix

Aquamarine Matrix

Emerald Crystal

Emerald Crystal

Aquamarine Crystal

Aquamarine Crystal

Mushroom Tourmaline

Mushroom Tourmaline

White Beryl

Smoky Quartz

Clear Obsidian

Goshenite Crystal

Goshenite Crystal

Magnetite

Crocoite

Quartz with Mica Schist (Pegmatite Specimen) (SiO2 (Silicon Dioxide) and Phyllosilicates (Biotite/Muscovite)) — Igneous/Metamorphic Hybrid

Quartz with Mica Schist (Pegmatite Specimen)

SiO2 (Silicon Dioxide) and Phyllosilicates (Biotite/Muscovite)

Igneous/Metamorphic Hybrid

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Amethyst Geode (polished heart-cut) (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst Geode (polished heart-cut)

Silicon Dioxide (SiO2) with iron impurities

Jasper and Quartz Breccia (Silicified Breccia / Microcrystalline Quartz with Iron Oxide) — sedimentary

Jasper and Quartz Breccia

Silicified Breccia / Microcrystalline Quartz with Iron Oxide

Quartz (specifically Citrine or Yellow Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (specifically Citrine or Yellow Quartz)

Silicon Dioxide (SiO2)

Blue Apatite (Fluorapatite / Apatite group (Ca5(PO4)3(F,Cl,OH))) — mineral

Blue Apatite

Fluorapatite / Apatite group (Ca5(PO4)3(F,Cl,OH))

Garnet Schist (Almandine Garnet in Micaceous Schist) — metamorphic

Garnet Schist

Almandine Garnet in Micaceous Schist

Jasper with Hematite (Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)) — sedimentary

Jasper with Hematite

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Kyanite in Quartz (Al2SiO5 in SiO2) — metamorphic

Kyanite in Quartz

Al2SiO5 in SiO2

Chert / Jasper Cobble (Microcrystalline Quartz (SiO2)) — sedimentary

Chert / Jasper Cobble

Microcrystalline Quartz (SiO2)

Green Fluorite (Calcium Fluoride (CaF2)) — mineral

Green Fluorite

Calcium Fluoride (CaF2)

Peacock Ore (Bornite (Cu5FeS4) or Chalcopyrite treated with acid) — mineral

Peacock Ore

Bornite (Cu5FeS4) or Chalcopyrite treated with acid

Tektite (Indochinite) (Tektite (Amorphous Meteoritic Glass)) — igneous

Tektite (Indochinite)

Tektite (Amorphous Meteoritic Glass)

Quartzite pebble with Quartz Vein (Metamorphic Quartzite (SiO2) with Quartz Veining) — metamorphic

Quartzite pebble with Quartz Vein

Metamorphic Quartzite (SiO2) with Quartz Veining

Quartzite Pebble (Metamorphic Quartzite (predominantly SiO2)) — metamorphic

Quartzite Pebble

Metamorphic Quartzite (predominantly SiO2)

Chert (Jasper variation) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper variation)

Microcrystalline Quartz (SiO2)

Blue-green chrysocolla rough specimen (Chrysocolla, hydrated copper aluminosilicate; commonly associated with malachite, quartz, and limonite) — mineral

Blue-green chrysocolla rough specimen

Chrysocolla, hydrated copper aluminosilicate; commonly associated with malachite, quartz, and limonite

Limonite/Goethite Iron Concretion (Hydrated iron oxide-hydroxide mixture (FeO(OH)·nH2O)) — mineral

Limonite/Goethite Iron Concretion

Hydrated iron oxide-hydroxide mixture (FeO(OH)·nH2O)

Banded Quartz (Silicon Dioxide (SiO2)) — mineral

Banded Quartz

Silicon Dioxide (SiO2)

Copper Ore with Malachite and Chrysocolla (Cu2CO3(OH)2 (Malachite) with Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla)) — mineral

Copper Ore with Malachite and Chrysocolla

Cu2CO3(OH)2 (Malachite) with Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla)

Black Obsidian (Volcanic Glass (SiO2 + impurities)) — Igneous

Black Obsidian

Volcanic Glass (SiO2 + impurities)

Yellow Agate (Silicon Dioxide (SiO2)) — mineral

Yellow Agate

Silicon Dioxide (SiO2)

Quartz pebble in concrete (Quartz (SiO₂), embedded in Portland-cement concrete) — mineral

Quartz pebble in concrete

Quartz (SiO₂), embedded in Portland-cement concrete

Fossiliferous Limestone (Crinoidal Limestone) (Biogenic Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Fossiliferous Limestone (Crinoidal Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Tumbled unakite (Unakite (epidote + pink K-feldspar + quartz)) — metamorphic

Tumbled unakite

Unakite (epidote + pink K-feldspar + quartz)

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

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

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

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Chalcedony (Agate) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chalcedony (Agate)

Cryptocrystalline Quartz (SiO2)

Granite Pebble (Phaneritic intrusive igneous rock) — igneous

Granite Pebble

Phaneritic intrusive igneous rock

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Yellow Quartz (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz

Silicon Dioxide (SiO2)

Chert (Iron-stained) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Green Onyx (Banded Calcite) (Banded Calcite / Aragonite (CaCO3)) — mineral

Green Onyx (Banded Calcite)

Banded Calcite / Aragonite (CaCO3)

Quartz (Smoky/Milky variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Dyed Agate (SiO2) — mineral

Dyed Agate

SiO2

Granite Pebble (Granite (composed primarily of Quartz, Feldspar, and Mica)) — igneous

Granite Pebble

Granite (composed primarily of Quartz, Feldspar, and Mica)

Chalcedony (Agate/Carnelian variant) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Agate/Carnelian variant)

Silicon Dioxide (SiO2)

Chert (Arrowhead Artifact) (Chert (SiO2)) — sedimentary

Chert (Arrowhead Artifact)

Chert (SiO2)

Agate (Chert/Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Agate (Chert/Chalcedony)

Silicon Dioxide (SiO2)

Chert (Arrowhead/Projectile Point) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Arrowhead/Projectile Point)

Microcrystalline quartz (SiO2)