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

Jasper (Silicon Dioxide (SiO2)) — sedimentary

Jasper

Silicon Dioxide (SiO2)

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

Chert (Arrowhead)

Chert (SiO2)

Silver (Native Silver Mineral) (Ag (Native Silver), Alloyed 90% Ag / 10% Cu) — mineral

Silver (Native Silver Mineral)

Ag (Native Silver), Alloyed 90% Ag / 10% Cu

Chalcedony (Common Opal or Agate variant) (Silicon dioxide (SiO2) with trace hydration) — mineral

Chalcedony (Common Opal or Agate variant)

Silicon dioxide (SiO2) with trace hydration

Common Opal in Host Rock (Hydrated Silica (SiO2·nH2O)) — mineraloid

Common Opal in Host Rock

Hydrated Silica (SiO2·nH2O)

Yellow Agate (Chalcedony) (Silicon Dioxide (SiO2)) — sedimentary

Yellow Agate (Chalcedony)

Silicon Dioxide (SiO2)

Limonite with Gold-bearing Quartz (Hydrated Iron Oxide Hydroxide, FeO(OH)·nH2O) — mineral

Limonite with Gold-bearing Quartz

Hydrated Iron Oxide Hydroxide, FeO(OH)·nH2O

Pyritic Gneiss (with Garnet) (Gneiss containing Pyrite (FeS2) and Almandine Garnet (Fe3Al2(SiO4)3)) — metamorphic

Pyritic Gneiss (with Garnet)

Gneiss containing Pyrite (FeS2) and Almandine Garnet (Fe3Al2(SiO4)3)

Desert Rose (Sand Barite/Gypsum Rose) (Barium Sulfate (BaSO4) or Hydrated Calcium Sulfate (CaSO4·2H2O)) — mineral

Desert Rose (Sand Barite/Gypsum Rose)

Barium Sulfate (BaSO4) or Hydrated Calcium Sulfate (CaSO4·2H2O)

Quartz / Common Agate (Silicon Dioxide (SiO2)) — mineral

Quartz / Common Agate

Silicon Dioxide (SiO2)

Amazonite (Microcline (Amazonstone), K(AlSi3O8)) — mineral

Amazonite

Microcline (Amazonstone), K(AlSi3O8)

Pegmatite with Smoky Quartz and Feldspar (Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8)) — igneous

Pegmatite with Smoky Quartz and Feldspar

Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8)

Ferruginous Sandstone (Ironstone) (Sedimentary rock with high iron oxide content (Fe2O3 / FeO(OH))) — sedimentary

Ferruginous Sandstone (Ironstone)

Sedimentary rock with high iron oxide content (Fe2O3 / FeO(OH))

Jasper (Petrified Wood variant) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Jasper (Petrified Wood variant)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Limonite/Goethite on Shale (Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock) — sedimentary

Limonite/Goethite on Shale

Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock

Citrine Quartz (Silicon Dioxide (SiO2)) — mineral

Citrine Quartz

Silicon Dioxide (SiO2)

Gold-bearing Quartz (Auriferous Quartz) (Quartz (SiO2) with native Gold (Au) inclusions) — mineral

Gold-bearing Quartz (Auriferous Quartz)

Quartz (SiO2) with native Gold (Au) inclusions

Pyrite or Chalcopyrite specimen (Gold-colored mineral coating) (Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)) — mineral

Pyrite or Chalcopyrite specimen (Gold-colored mineral coating)

Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)

Alexandrite (Chrysoberyl (BeAl2O4)) — mineral

Alexandrite

Chrysoberyl (BeAl2O4)

Riverstone (Sandstone or Quartzite) (Sedimentary Rock (likely Arenite)) — sedimentary

Riverstone (Sandstone or Quartzite)

Sedimentary Rock (likely Arenite)

Brecciated Jasper (Silicon Dioxide (SiO2) with Hematite impurities) — sedimentary

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Chert (including Common Opal and Chalcedony) (Silicon Dioxide (SiO2 · nH2O)) — sedimentary

Chert (including Common Opal and Chalcedony)

Silicon Dioxide (SiO2 · nH2O)

Herkimer Diamond (Quartz (Silicon Dioxide) - SiO2) — mineral

Herkimer Diamond

Quartz (Silicon Dioxide) - SiO2

Desert Rose (Gypsum (CaSO4·2H2O) or Barite (BaSO4) inclusions in sand) — mineral

Desert Rose

Gypsum (CaSO4·2H2O) or Barite (BaSO4) inclusions in sand

River Pebble (Gneiss or Quartzite) (Metamorphic rock specimen (likely Gneiss or impure Quartzite)) — metamorphic

River Pebble (Gneiss or Quartzite)

Metamorphic rock specimen (likely Gneiss or impure Quartzite)

Chalcedony Geode Fragment (Cryptocrystalline Quartz (SiO2)) — mineral

Chalcedony Geode Fragment

Cryptocrystalline Quartz (SiO2)

Agate Geode (Silicon Dioxide (SiO2) - Banded Chalcedony with Quartz) — mineral

Agate Geode

Silicon Dioxide (SiO2) - Banded Chalcedony with Quartz

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

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Quartzite (Ferruginous) (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Quartzite (Ferruginous)

Metamorphosed Quartz Sandstone (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Malachite (Copper carbonate hydroxide [Cu2CO3(OH)2]) — mineral

Malachite

Copper carbonate hydroxide [Cu2CO3(OH)2]

Amethyst (Rose Quartz type) (SiO2 (Silicon Dioxide)) — mineral

Amethyst (Rose Quartz type)

SiO2 (Silicon Dioxide)

Tumbled or rough turquoise-like specimen (Turquoise, hydrated copper aluminum phosphate — CuAl₆(PO₄)₄(OH)₈·4H₂O; identification is uncertain from the image) — mineral

Tumbled or rough turquoise-like specimen

Turquoise, hydrated copper aluminum phosphate — CuAl₆(PO₄)₄(OH)₈·4H₂O; identification is uncertain from the image

Quartzite (River Cobble) (Recrystallized Quartz (SiO2)) — metamorphic

Quartzite (River Cobble)

Recrystallized Quartz (SiO2)

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

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Heliodor (Yellow Beryl) / Greenish-Yellow Beryl (Beryl (Be3Al2Si6O18)) — mineral

Heliodor (Yellow Beryl) / Greenish-Yellow Beryl

Beryl (Be3Al2Si6O18)

Petrified Wood (Silicified wood (primarily quartz, SiO2)) — fossil

Petrified Wood

Silicified wood (primarily quartz, SiO2)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Sandstone Pebble (Sedimentary Rock (Quartzose Sandstone)) — sedimentary

Sandstone Pebble

Sedimentary Rock (Quartzose Sandstone)

Vein-filled Basalt or Diabase Pebble (Mafic igneous rock with quartz/calcite veins) — igneous

Vein-filled Basalt or Diabase Pebble

Mafic igneous rock with quartz/calcite veins

Amygdaloidal Basalt (Extrusive Igneous Rock with Secondary Mineral Fillings) — igneous

Amygdaloidal Basalt

Extrusive Igneous Rock with Secondary Mineral Fillings

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)