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

Quartz with Spessartine Garnet and Biotite (SiO2 (Quartz) with Mn3Al2(SiO4)3 (Spessartine)) — mineral

Quartz with Spessartine Garnet and Biotite

SiO2 (Quartz) with Mn3Al2(SiO4)3 (Spessartine)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

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

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Diamond (Native Carbon (C)) — gemstone

Diamond

Native Carbon (C)

Diamond (Natural Diamond (Carbon, C)) — gemstone

Diamond

Natural Diamond (Carbon, C)

Diamond (Carbon (C)) — gemstone

Diamond

Carbon (C)

Diamond (or Diamond Simulant) (Carbon (C)) — gemstone

Diamond (or Diamond Simulant)

Carbon (C)

Diamond (or Simulant) (Carbon (C)) — gemstone

Diamond (or Simulant)

Carbon (C)

Diamond (Diamond (Pure Carbon - C)) — mineral

Diamond

Diamond (Pure Carbon - C)

Diamond (Diamond (C)) — mineral

Diamond

Diamond (C)

Diamond (C (Native Carbon)) — mineral

Diamond

C (Native Carbon)

Diamond (Carbon (C)) — mineral

Diamond

Carbon (C)

Diamond (in a gold setting) (Carbon (C)) — mineral

Diamond (in a gold setting)

Carbon (C)

Chert Nodule (Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert Nodule (Flint)

Silicon Dioxide (SiO2)

Quartzite Pebble (Quartzite (SiO2)) — metamorphic

Quartzite Pebble

Quartzite (SiO2)

Quartz (Chert/Chalcedony variety) (Silicon Dioxide (SiO2)) — sedimentary

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Polished Agate Geode (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — mineral

Polished Agate Geode

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Limonite-stained Chert/Jasper (Microcrystalline Quartz (SiO2) with Iron Oxides (FeO(OH)·nH2O)) — sedimentary

Limonite-stained Chert/Jasper

Microcrystalline Quartz (SiO2) with Iron Oxides (FeO(OH)·nH2O)

Jasper (Green Jasper/Heliotropic Chert) (Silicon Dioxide (SiO₂)) — sedimentary

Jasper (Green Jasper/Heliotropic Chert)

Silicon Dioxide (SiO₂)

Chert Breccia (Brecciated Chert (Microcrystalline SiO2)) — sedimentary

Chert Breccia

Brecciated Chert (Microcrystalline SiO2)

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

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Granite (with Beryl/Aquamarine) (Granite (Feldspar, Quartz, Mica, and Beryl Be3Al2Si6O18)) — igneous

Granite (with Beryl/Aquamarine)

Granite (Feldspar, Quartz, Mica, and Beryl Be3Al2Si6O18)

Iron-stained quartz-rich rock, possibly goethite-bearing quartz (Quartz (SiO₂) with iron oxides/hydroxides, likely goethite or limonite) — mineral

Iron-stained quartz-rich rock, possibly goethite-bearing quartz

Quartz (SiO₂) with iron oxides/hydroxides, likely goethite or limonite

N/A (Non-Geological Specimen) — N/A

N/A (Non-Geological Specimen)

Granite Pebble with Quartz/Feldspar Vein (Intrusive Felsic Igneous Rock (Granite)) — igneous

Granite Pebble with Quartz/Feldspar Vein

Intrusive Felsic Igneous Rock (Granite)

Quartz geode with iron-oxide matrix (Quartz (SiO₂), likely with limonite/goethite and possibly calcite) — mineral

Quartz geode with iron-oxide matrix

Quartz (SiO₂), likely with limonite/goethite and possibly calcite

Granite (Granite (composed mainly of Quartz, Potassium Feldspar, Plagioclase, and Biotite/Mica)) — igneous

Granite

Granite (composed mainly of Quartz, Potassium Feldspar, Plagioclase, and Biotite/Mica)

Chalcedony with Quartz (Silicon Dioxide (SiO2)) — mineral

Chalcedony with Quartz

Silicon Dioxide (SiO2)

Quartz with Mica (likely Muscovite) (Silicon Dioxide (SiO2) with Potassium Aluminum Silicate Hydroxide Fluoride) — igneous/metamorphic

Quartz with Mica (likely Muscovite)

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate Hydroxide Fluoride

igneous/metamorphic

Tiger's Eye (Tumbled Blue/Black-Golden variety) (Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)) — metamorphic

Tiger's Eye (Tumbled Blue/Black-Golden variety)

Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)

Citrine (Heat-treated Amethyst) (Silicon Dioxide (SiO2) with iron impurities) — mineral

Citrine (Heat-treated Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Septarian Nodule Geode (Septarian concretions (composed of Calcite, Aragonite, and Limestone)) — sedimentary

Septarian Nodule Geode

Septarian concretions (composed of Calcite, Aragonite, and Limestone)

Basalt River Cobble (Basalt (Aphanitic Mafic Volcanic Rock)) — igneous

Basalt River Cobble

Basalt (Aphanitic Mafic Volcanic Rock)

Granite (Granite; primarily quartz, alkali feldspar, plagioclase, and biotite/hornblende) — igneous

Granite

Granite; primarily quartz, alkali feldspar, plagioclase, and biotite/hornblende

Quartz-bearing conglomeratic rock with orange feldspar/calcite inclusion (Probably porphyritic granite or granitic pegmatite; exact identification requires a thin section or tests) — igneous

Quartz-bearing conglomeratic rock with orange feldspar/calcite inclusion

Probably porphyritic granite or granitic pegmatite; exact identification requires a thin section or tests

Blue-gray quartz-bearing metamorphic rock (likely gneiss or schist) (Quartz–feldspar–mica rock; exact identification requires testing) — metamorphic

Blue-gray quartz-bearing metamorphic rock (likely gneiss or schist)

Quartz–feldspar–mica rock; exact identification requires testing

Druzy Quartz on Matrix (Chert/Limestone) (Silicon Dioxide (SiO2) with Carbonate host rock) — sedimentary

Druzy Quartz on Matrix (Chert/Limestone)

Silicon Dioxide (SiO2) with Carbonate host rock

Druzy Quartz on Matrix (likely Limestone or Sandstone) (Silicon Dioxide (SiO2) with various trace impurities) — Mineral on Sedimentary Rock

Druzy Quartz on Matrix (likely Limestone or Sandstone)

Silicon Dioxide (SiO2) with various trace impurities

Mineral on Sedimentary Rock

Agate (Silicon dioxide (SiO2) - variety Chalcedony) — mineral

Agate

Silicon dioxide (SiO2) - variety Chalcedony

Tumbled Carnelian (Silicon Dioxide (Variety of Chalcedony), SiO2) — gemstone

Tumbled Carnelian

Silicon Dioxide (Variety of Chalcedony), SiO2

Quartz Vein in Host Rock (Silicon dioxide (SiO2) veins in metamorphic/igneous host rock) — igneous

Quartz Vein in Host Rock

Silicon dioxide (SiO2) veins in metamorphic/igneous host rock

Garnet Schist (Almandine-bearing Mica Schist) — metamorphic

Garnet Schist

Almandine-bearing Mica Schist