Rock Identifier

Category

Mineral And Sedimentary

Browse mineral and sedimentary specimens identified by the Rock Identifier community.

Blue Calcite (Calcium Carbonate (CaCO3)) — mineral

Blue Calcite

Calcium Carbonate (CaCO3)

Pyrite in Matrix (Quartz/Schist) (Iron Sulfide (FeS2)) — mineral

Pyrite in Matrix (Quartz/Schist)

Iron Sulfide (FeS2)

Garnet Schist (Garnet-bearing Mica Schist (variety of compositions, often Al2SiO5 with X3Y2(SiO4)3)) — metamorphic

Garnet Schist

Garnet-bearing Mica Schist (variety of compositions, often Al2SiO5 with X3Y2(SiO4)3)

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

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Shale (Fissile Clay-dominant Mudrock (SiO2, Al2O3, K2O, Na2O, CaO, MgO)) — sedimentary

Shale

Fissile Clay-dominant Mudrock (SiO2, Al2O3, K2O, Na2O, CaO, MgO)

Sandstone (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone

Arenite (composed primarily of SiO2)

Mica Schist (Crystalline Schist (often containing Muscovite, Biotite, and Quartz)) — metamorphic

Mica Schist

Crystalline Schist (often containing Muscovite, Biotite, and Quartz)

Fossilized Bone Fragment (Permineralized Skeletal Element (Likely Vertebrate)) — sedimentary

Fossilized Bone Fragment

Permineralized Skeletal Element (Likely Vertebrate)

Yellow Jasper (Silicon Dioxide (SiO2) with Goethite or Limonite inclusions) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite or Limonite inclusions

Banded Jasper (Carnelian Jasper) (Silicon Dioxide (SiO2) with Iron Oxide inclusions) — sedimentary

Banded Jasper (Carnelian Jasper)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Chert (Jasper/Flint variety) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Yellow Jasper (Silicon dioxide (SiO2)) — sedimentary

Yellow Jasper

Silicon dioxide (SiO2)

Concretion (Sandstone) (Carbonate-cemented Sandstone Concretion) — sedimentary

Concretion (Sandstone)

Carbonate-cemented Sandstone Concretion

Jasper (Tumbled) (Silicon Dioxide (SiO₂)) — sedimentary

Jasper (Tumbled)

Silicon Dioxide (SiO₂)

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

Yellow Jasper

Jasper (Silicon Dioxide, SiO2)

Opal (Precious Opal) (Hydrated Silica (SiO2·nH2O)) — mineral

Opal (Precious Opal)

Hydrated Silica (SiO2·nH2O)

Sandstone with Tafoni Weathering (Arenite (SiO2 based)) — sedimentary

Sandstone with Tafoni Weathering

Arenite (SiO2 based)

Chert (Septarian or Nodular variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Septarian or Nodular variety)

Microcrystalline Quartz (SiO2)

Calcite (Calcite (Mineral; CaCO₃)) — Mineral

Calcite

Calcite (Mineral; CaCO₃)

Druzy Quartz Geode (Vug) (Silicon Dioxide (SiO2)) — mineral

Druzy Quartz Geode (Vug)

Silicon Dioxide (SiO2)

Fossil Rugose Coral (Horn Coral) (Order Rugosa (likely Grewingkia or Heliophyllum species); Calcium Carbonate (CaCO3)) — sedimentary

Fossil Rugose Coral (Horn Coral)

Order Rugosa (likely Grewingkia or Heliophyllum species); Calcium Carbonate (CaCO3)

Chalcedony (Cryptocrystalline Quartz (SiO2)) — mineral

Chalcedony

Cryptocrystalline Quartz (SiO2)

Brown Agate (Silicon Dioxide (SiO2)) — mineral

Brown Agate

Silicon Dioxide (SiO2)

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Quartz (Microcrystalline/Chert) (Silicon Dioxide (SiO2)) — mineral

Quartz (Microcrystalline/Chert)

Silicon Dioxide (SiO2)

White Quartz (Silicon Dioxide (SiO2)) — mineral

White Quartz

Silicon Dioxide (SiO2)

Jasper River Pebble (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — mineral

Jasper River Pebble

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Carnelian (SiO2 (Microcrystalline Quartz / Chalcedony)) — mineral

Carnelian

SiO2 (Microcrystalline Quartz / Chalcedony)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Chalcedony in Host Rock (Silicon Dioxide (SiO2)) — mineral

Chalcedony in Host Rock

Silicon Dioxide (SiO2)

Carnelian (Carnelian (Microcrystalline Quartz, SiO2 with Fe2O3 impurities)) — Mineral

Carnelian

Carnelian (Microcrystalline Quartz, SiO2 with Fe2O3 impurities)

Carnelian (Carnelian (a variety of Chalcedony), SiO2 (Silicon Dioxide)) — mineral

Carnelian

Carnelian (a variety of Chalcedony), SiO2 (Silicon Dioxide)

Caribbean Calcite (Calcite and Aragonite (CaCO3)) — mineral

Caribbean Calcite

Calcite and Aragonite (CaCO3)

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

Carnelian (Agate/Chalcedony)

Silicon Dioxide (SiO2)

Blue Chalcedony (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — mineral

Blue Chalcedony

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

White Chalcedony (Agate)

Silicon Dioxide (SiO2)

Rough Quartz (likely Rose or Smoky variant) (Silicon Dioxide (SiO2)) — mineral

Rough Quartz (likely Rose or Smoky variant)

Silicon Dioxide (SiO2)

Green Calcite (Calcium Carbonate (CaCO3)) — mineral

Green Calcite

Calcium Carbonate (CaCO3)