Rock Identifier

Category

Mineral Specimen

Browse mineral specimen specimens identified by the Rock Identifier community.

Learn about Mineral Specimen in the encyclopedia

Emerald in Matrix

Emerald in Matrix

Aquamarine Matrix

Aquamarine Matrix

Morganite Crystal

Morganite Crystal

Emerald Crystal

Emerald Crystal

Aquamarine Crystal

Aquamarine Crystal

Mushroom Tourmaline

Mushroom Tourmaline

Glauconite

Hutcheonite

Halite

Sperrylite

Baddeleyite

Anatase

Botryoidal Agate / Chalcedony Geode (Silicon Dioxide (SiO2)) — mineral

Botryoidal Agate / Chalcedony Geode

Silicon Dioxide (SiO2)

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

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

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2) with Hematite/Limonite

Banded Sedimentary Rock (Wishbone Stone / Banded Quartzite or Limestone) (Silicified limestone or banded sedimentary rock with mineral veins) — sedimentary

Banded Sedimentary Rock (Wishbone Stone / Banded Quartzite or Limestone)

Silicified limestone or banded sedimentary rock with mineral veins

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

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Amygdaloidal Basalt with Quartz Veining (Basalt (Extrusive Igneous Rock) with Quartz (SiO2) veining) — igneous

Amygdaloidal Basalt with Quartz Veining

Basalt (Extrusive Igneous Rock) with Quartz (SiO2) veining

Schist (Mica Schist (Metamorphic Rock)) — metamorphic

Schist

Mica Schist (Metamorphic Rock)

Chalcedony Geode / Quartz Druzy (Silicon Dioxide (SiO2)) — mineral

Chalcedony Geode / Quartz Druzy

Silicon Dioxide (SiO2)

Chalcopyrite (CuFeS2 (Copper Iron Sulfide)) — mineral

Chalcopyrite

CuFeS2 (Copper Iron Sulfide)

Quartz (Bull Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Bull Quartz)

Silicon Dioxide (SiO2)

Pyrite in Quartz (Drill Core) (Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions) — igneous/metamorphic (hydrothermal)

Pyrite in Quartz (Drill Core)

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions

igneous/metamorphic (hydrothermal)

Geode / Fossilized Gastropod or Shell Cast (Silicon dioxide (Quartz) replacement / fossil mold) — sedimentary

Geode / Fossilized Gastropod or Shell Cast

Silicon dioxide (Quartz) replacement / fossil mold

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

Chalcedony (Agate) Pebble

Silicon Dioxide (SiO2)

Quartz with Iron Staining (Silicon Dioxide (SiO2) with Fe2O3 (Hematite/Limonite) inclusions) — mineral

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Fe2O3 (Hematite/Limonite) inclusions

Brecciated Red Jasper (Microcrystalline Quartz (Chalcedony), SiO2) — sedimentary

Brecciated Red Jasper

Microcrystalline Quartz (Chalcedony), SiO2

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

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Smoky quartz (likely) (Quartz, silicon dioxide (SiO₂)) — mineral

Smoky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Crystalline) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Crystalline)

Silicon Dioxide (SiO2)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Citrine variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Citrine variety)

Silicon Dioxide (SiO2)

Calcite specimen (Calcite (calcium carbonate, CaCO₃), likely crystalline limestone or cave-calcite aggregate) — mineral

Calcite specimen

Calcite (calcium carbonate, CaCO₃), likely crystalline limestone or cave-calcite aggregate

Bivalve Fossil (Shell-bearing Sedimentary Rock) (Class Bivalvia (Phylum Mollusca) within a Calcarenite/Sandstone matrix) — fossil

Bivalve Fossil (Shell-bearing Sedimentary Rock)

Class Bivalvia (Phylum Mollusca) within a Calcarenite/Sandstone matrix

Portable Ceramic Space Heater (Polished Acrylonitrile Butadiene Styrene (ABS) Plastic with Ceramic Heating Elements) — not a rock (synthetic/industrial object)

Portable Ceramic Space Heater

Polished Acrylonitrile Butadiene Styrene (ABS) Plastic with Ceramic Heating Elements

not a rock (synthetic/industrial object)

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

Jasper

Jasper (Silicon Dioxide, SiO2)

Granite or Pegmatite with Mica (Granitoid) — igneous

Granite or Pegmatite with Mica

Granitoid

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

Banded Agate (with Quartz Geode Center)

Silicon Dioxide (SiO2)

Common Opal / Chert (Hydrated silica (SiO2·nH2O) or Microcrystalline Quartz (SiO2)) — mineral

Common Opal / Chert

Hydrated silica (SiO2·nH2O) or Microcrystalline Quartz (SiO2)

Amethyst quartz crystal (Quartz, silicon dioxide (SiO₂), purple variety amethyst) — mineral

Amethyst quartz crystal

Quartz, silicon dioxide (SiO₂), purple variety amethyst

Quartz Vein in Sedimentary Rock (Silicon Dioxide (SiO2) with host Chert or Limestone) — mineral

Quartz Vein in Sedimentary Rock

Silicon Dioxide (SiO2) with host Chert or Limestone

Basalt with Olivine Phenocrysts (Aphanitic Mafic Volcanic Rock (Basalt)) — igneous

Basalt with Olivine Phenocrysts

Aphanitic Mafic Volcanic Rock (Basalt)

Calcite (Yellow/Orange variety - sometimes called Honey Calcite) (Calcite) — Mineral

Calcite (Yellow/Orange variety - sometimes called Honey Calcite)

Calcite

Jasper (Microcrystalline Quartz (SiO2)) — mineral

Jasper

Microcrystalline Quartz (SiO2)

Carnelian (SiO2 (Silicon dioxide)) — mineral

Carnelian

SiO2 (Silicon dioxide)

Iron-Stained Quartz (Silicon Dioxide with Iron Oxide (SiO2 with Fe2O3)) — mineral

Iron-Stained Quartz

Silicon Dioxide with Iron Oxide (SiO2 with Fe2O3)

Moss Agate (Silicon dioxide (SiO2) with inclusions) — Mineral

Moss Agate

Silicon dioxide (SiO2) with inclusions

Limonite (often after Hematite or Goethite) (Limonite (FeO(OH)·nH2O)) — mineral

Limonite (often after Hematite or Goethite)

Limonite (FeO(OH)·nH2O)

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

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2) with Hematite/Limonite

Quartz (specifically a water-worn Quartzite or Chalcedony pebble) (Silicon Dioxide (SiO2)) — mineral

Quartz (specifically a water-worn Quartzite or Chalcedony pebble)

Silicon Dioxide (SiO2)

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

Quartz (White/Milky with Iron Staining)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Sandstone (Clastic Sedimentary Rock) — sedimentary

Sandstone

Clastic Sedimentary Rock