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

Quartzite Pebble (Quartzite (primarily SiO2)) — metamorphic

Quartzite Pebble

Quartzite (primarily SiO2)

Agate (Carnelian type) (Silicon Dioxide (SiO2)) — mineral

Agate (Carnelian type)

Silicon Dioxide (SiO2)

Vesicular volcanic rock, possibly weathered basalt or scoria (Basaltic scoria/vesicular basalt; predominantly plagioclase, pyroxene, and iron-titanium oxides) — igneous

Vesicular volcanic rock, possibly weathered basalt or scoria

Basaltic scoria/vesicular basalt; predominantly plagioclase, pyroxene, and iron-titanium oxides

Quartz Druze on Matrix (Silicon Dioxide (SiO2)) — mineral

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

River Stone (likely Mudstone or Siltstone) (Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)) — sedimentary

River Stone (likely Mudstone or Siltstone)

Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)

Polished tiger’s-eye (likely brecciated or iron-stained) (Quartz, SiO₂, with crocidolite pseudomorphs and iron oxides) — gemstone

Polished tiger’s-eye (likely brecciated or iron-stained)

Quartz, SiO₂, with crocidolite pseudomorphs and iron oxides

Feldspar (likely Amazonite or Plagioclase) (Potassium Aluminum Silicate (KAlSi3O8) or Sodium/Calcium Aluminum Silicate) — mineral

Feldspar (likely Amazonite or Plagioclase)

Potassium Aluminum Silicate (KAlSi3O8) or Sodium/Calcium Aluminum Silicate

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

Chert Breccia

Brecciated Chert (Microcrystalline SiO2)

Conglomerate (Clastic Sedimentary Rock (Conglomerate)) — sedimentary

Conglomerate

Clastic Sedimentary Rock (Conglomerate)

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

Quartz (Milky/Crystalline)

Silicon Dioxide (SiO2)

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

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Jasper Agate (Silicon dioxide (SiO2)) — mineral

Jasper Agate

Silicon dioxide (SiO2)

Carnelian (SiO2 (Silicon Dioxide)) — gemstone

Carnelian

SiO2 (Silicon Dioxide)

Weathered gray metamorphic rock, likely phyllite or slate (Micaceous quartz–phyllosilicate rock; commonly quartz + muscovite/illite ± chlorite) — metamorphic

Weathered gray metamorphic rock, likely phyllite or slate

Micaceous quartz–phyllosilicate rock; commonly quartz + muscovite/illite ± chlorite

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)

Zoisite with Rubellite (Ruby in Zoisite) (Zoisite with inclusions of Hornblende (Anyolite)) — metamorphic

Zoisite with Rubellite (Ruby in Zoisite)

Zoisite with inclusions of Hornblende (Anyolite)

Vesicular quartz-rich rock, possibly weathered rhyolite or silicified volcanic breccia (Silica-rich volcanic rock; likely microcrystalline quartz (SiO₂) with altered feldspar and iron-oxide staining) — igneous

Vesicular quartz-rich rock, possibly weathered rhyolite or silicified volcanic breccia

Silica-rich volcanic rock; likely microcrystalline quartz (SiO₂) with altered feldspar and iron-oxide staining

Yellow Quartz or Citrine Quartz (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz or Citrine Quartz

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — Mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Flint (or Chert) (Microcrystalline quartz (SiO2)) — sedimentary

Flint (or Chert)

Microcrystalline quartz (SiO2)

Raw Quartz (Silicon Dioxide (SiO2)) — mineral

Raw Quartz

Silicon Dioxide (SiO2)

Limonite (FeO(OH)•nH2O) — mineral

Limonite

FeO(OH)•nH2O

Quartz Mineral (Silicon Dioxide (SiO2)) — mineral

Quartz Mineral

Silicon Dioxide (SiO2)

Agate Geode Slice (with Druzy Quartz) (Silicon Dioxide (SiO2)) — mineral

Agate Geode Slice (with Druzy Quartz)

Silicon Dioxide (SiO2)

Chert (Polished Gemstone / River Stone) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Polished Gemstone / River Stone)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

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

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Quartz (Milky or Smoky Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky or Smoky Quartz)

Silicon Dioxide (SiO2)

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

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Brecciated Jasper (SiO2 (Silicon Dioxide)) — sedimentary

Brecciated Jasper

SiO2 (Silicon Dioxide)

Granite (Granite (Phaneritic Quartz-Feldspar rock)) — igneous

Granite

Granite (Phaneritic Quartz-Feldspar rock)

Quartz Geode in Sedimentary Host Rock (Silicon Dioxide (SiO2) in Carbonate Matrix) — sedimentary

Quartz Geode in Sedimentary Host Rock

Silicon Dioxide (SiO2) in Carbonate Matrix

Limonite (FeO(OH)·nH2O) — mineral

Limonite

FeO(OH)·nH2O

Yellow Quartz (Polished) (Silicon Dioxide (SiO2) with iron inclusions) — mineral

Yellow Quartz (Polished)

Silicon Dioxide (SiO2) with iron inclusions

Chalcedony (Desert Rose or Botryoidal Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Desert Rose or Botryoidal Chalcedony)

Silicon Dioxide (SiO2)

Pyrite with Vesicular Matrix (Iron Disulfide (FeS2)) — mineral

Pyrite with Vesicular Matrix

Iron Disulfide (FeS2)

Chert (Banded) (Cryptocrystalline Silica (SiO2)) — sedimentary

Chert (Banded)

Cryptocrystalline Silica (SiO2)

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)

Gold-bearing Quartz / Auriferous River Rock (Lode Gold in Quartz Matrix (SiO2 + Au)) — sedimentary

Gold-bearing Quartz / Auriferous River Rock

Lode Gold in Quartz Matrix (SiO2 + Au)

Labradorite ((Ca, Na)(Al, Si)4O8) — mineral

Labradorite

(Ca, Na)(Al, Si)4O8