Rock Identifier

Category

Mineralological Specimen

Browse mineralological specimen specimens identified by the Rock Identifier community.

Learn about Mineralological 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

Smoky Quartz

Clear Obsidian

Goshenite Crystal

Goshenite Crystal

Magnetite

Crocoite

Elbaite

Galena with Pyrite (Lead Sulfide (PbS) associated with Iron Sulfide (FeS2)) — mineral

Galena with Pyrite

Lead Sulfide (PbS) associated with Iron Sulfide (FeS2)

Tumbled metallic sulfide mineral, likely pyrite (Pyrite (FeS₂), tentatively; possibly marcasite or a pyrite-rich nodule) — mineral

Tumbled metallic sulfide mineral, likely pyrite

Pyrite (FeS₂), tentatively; possibly marcasite or a pyrite-rich nodule

Polished banded agate (Microcrystalline quartz (chalcedony), SiO₂) — mineral

Polished banded agate

Microcrystalline quartz (chalcedony), SiO₂

Botryoidal Quartz or Chalcedony (Silicon Dioxide (SiO2)) — mineral

Botryoidal Quartz or Chalcedony

Silicon Dioxide (SiO2)

Quartz Druzy (Silicon Dioxide (SiO2)) — mineral

Quartz Druzy

Silicon Dioxide (SiO2)

Aquamarine (Beryl (Be3Al2(SiO3)6)) — gemstone

Aquamarine

Beryl (Be3Al2(SiO3)6)

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

Agate (or Chalcedony)

Silicon Dioxide (SiO2)

Unidentified Dark Mineral or Rock (Indeterminate (Likely Silicon Dioxide or Carbon-based)) — mineral

Unidentified Dark Mineral or Rock

Indeterminate (Likely Silicon Dioxide or Carbon-based)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Jasper or Agate Nodule (SiO2) — mineral

Jasper or Agate Nodule

SiO2

Tumbled carnelian (Carnelian, orange-red chalcedony (microcrystalline quartz, SiO₂)) — gemstone

Tumbled carnelian

Carnelian, orange-red chalcedony (microcrystalline quartz, SiO₂)

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

Red Jasper

Silicon Dioxide (SiO2) with hematite impurities

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Quartz (Citrine or Iron-Stained) (SiO2) — mineral

Quartz (Citrine or Iron-Stained)

SiO2

Porphyritic Basalt or Andesite (Porphyritic Basalt or Porphyritic Andesite) — igneous

Porphyritic Basalt or Andesite

Porphyritic Basalt or Porphyritic Andesite

Quartzite with Epidote (Quartzite with Epidote inclusions) — metamorphic

Quartzite with Epidote

Quartzite with Epidote inclusions

Yellow Quartzite (Silicon Dioxide (SiO2)) — metamorphic

Yellow Quartzite

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Dyed Fuchsia Tiger’s Eye (Pseudomorph of Quartz after Crocidolite (SiO2)) — metamorphic

Dyed Fuchsia Tiger’s Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Dyed Agate (Silicon Dioxide (SiO2) - Chalcedony variety) — sedimentary

Dyed Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Schist (Mica Schist) — metamorphic

Schist

Mica Schist

Sandstone (Limonitic/Arkose) (Sandstone (primarily SiO2 with FeO(OH)·nH2O)) — sedimentary

Sandstone (Limonitic/Arkose)

Sandstone (primarily SiO2 with FeO(OH)·nH2O)

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

Jasper

Silicon Dioxide (SiO2) with impurities

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

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

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Limestone with Fossil Fragments (Bioclastic Limestone (CaCO3)) — sedimentary

Limestone with Fossil Fragments

Bioclastic Limestone (CaCO3)

Chert (Chert (SiO2)) — sedimentary

Chert

Chert (SiO2)

Druzy Quartz on Matrix (Silicon Dioxide (SiO2) on host rock) — mineral

Druzy Quartz on Matrix

Silicon Dioxide (SiO2) on host rock

Sandstone (Ferruginous) (Arenite with Iron-Oxide Cement) — sedimentary

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Quartzite (SiO2 (Silicon Dioxide)) — metamorphic

Quartzite

SiO2 (Silicon Dioxide)

Chert (Flint/Jasper variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Flint/Jasper variety)

Microcrystalline Quartz (SiO2)

Red Sandstone (Ferruginous Sandstone (SiO2 dominated with Fe2O3)) — sedimentary

Red Sandstone

Ferruginous Sandstone (SiO2 dominated with Fe2O3)

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

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

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

Satin Spar Selenite

Gypsum (CaSO4·2H2O)

Carnelian Agate (Silicon Dioxide (SiO2)) — mineral

Carnelian Agate

Silicon Dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Gabbro or Diorite with Felsic intrusion (Mafic to intermediate intrusive igneous rock with felsic vein/inclusion) — igneous

Gabbro or Diorite with Felsic intrusion

Mafic to intermediate intrusive igneous rock with felsic vein/inclusion

Quartzite with Quartz Veins (Quartzite) — Metamorphic

Quartzite with Quartz Veins

Quartzite

Red Jasper or Iron-stained Quartz (SiO2 with Fe impurities) — mineral

Red Jasper or Iron-stained Quartz

SiO2 with Fe impurities

Sardonyx or Carnelian Agate (Silicon Dioxide (SiO2) with iron impurities) — mineral

Sardonyx or Carnelian Agate

Silicon Dioxide (SiO2) with iron impurities

Sandstone (Arenite) — sedimentary

Sandstone

Arenite