Rock Identifier

Category

Mineralogical Specimen

Browse mineralogical specimen specimens identified by the Rock Identifier community.

Learn about Mineralogical 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

White Beryl

Smoky Quartz

Clear Obsidian

Goshenite Crystal

Goshenite Crystal

Magnetite

Crocoite

Mica Schist (Mica Schist) — metamorphic

Mica Schist

Mica Schist

Basalt (Beach Pebble) (Basalt (Aphanitic Mafic Igneous Rock)) — igneous

Basalt (Beach Pebble)

Basalt (Aphanitic Mafic Igneous Rock)

River Cobble (likely Quartzite or Sandstone) (Silicon dioxide (SiO2)) — sedimentary

River Cobble (likely Quartzite or Sandstone)

Silicon dioxide (SiO2)

Chondrite Meteorite (L or H Ordinary Chondrite) — meteorite

Chondrite Meteorite

L or H Ordinary Chondrite

Agate Geode (Chalcedony (cryptocrystalline SiO2)) — mineral

Agate Geode

Chalcedony (cryptocrystalline SiO2)

Amber / Copal (Succinite (fossilized resin)) — mineraloid

Amber / Copal

Succinite (fossilized resin)

Jasper and Chalcedony Nodule (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Jasper and Chalcedony Nodule

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Native Silver Nugget (Silver (Ag)) — mineral

Native Silver Nugget

Silver (Ag)

Quartz (Iron-Stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Beryl (likely Aquamarine or Green Beryl) (Beryllium aluminum silicate (Be3Al2Si6O18)) — mineral

Beryl (likely Aquamarine or Green Beryl)

Beryllium aluminum silicate (Be3Al2Si6O18)

Yellow Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Greasy Quartz (likely carved Milky Quartz or Aventurine) (Silicon Dioxide (SiO2)) — mineral

Greasy Quartz (likely carved Milky Quartz or Aventurine)

Silicon Dioxide (SiO2)

Dendritic Chalcedony (Agate) (Cryptocrystalline Quartz (SiO2)) — mineral

Dendritic Chalcedony (Agate)

Cryptocrystalline Quartz (SiO2)

Massive Quartz with Host Rock (Silicon Dioxide (SiO2)) — mineral

Massive Quartz with Host Rock

Silicon Dioxide (SiO2)

Specular Hematite (Specularite) (Hematite (Fe2O3)) — mineral

Specular Hematite (Specularite)

Hematite (Fe2O3)

Amethyst (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Silver (Jewelry Specimen) (Native Silver (Ag)) — Mineral (Native Element)

Silver (Jewelry Specimen)

Native Silver (Ag)

Mineral (Native Element)

Unknown Rock Specimen — igneous

Unknown Rock Specimen

Chert (Gravel specimen) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Gravel specimen)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz Druze (Silicon Dioxide (SiO2)) — mineral

Quartz Druze

Silicon Dioxide (SiO2)

Agate (Silicon Dioxide / Cryptocrystalline Quartz (SiO2)) — mineral

Agate

Silicon Dioxide / Cryptocrystalline Quartz (SiO2)

Chert (Yellow Jasper variant) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Yellow Jasper variant)

Silicon Dioxide (SiO2)

Polished fossilized ammonite or nautiloid shell (Ammonoidea or Nautiloidea; originally aragonitic shell, commonly replaced by calcite or chalcedony) — fossil

Polished fossilized ammonite or nautiloid shell

Ammonoidea or Nautiloidea; originally aragonitic shell, commonly replaced by calcite or chalcedony

Agate (Polished Slice) (Banded Chalcedony (SiO2)) — mineral

Agate (Polished Slice)

Banded Chalcedony (SiO2)

Sandstone (Weathered Pebble) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Weathered Pebble)

Arenite (primarily SiO2)

Citrine Quartz (Silicon Dioxide (SiO2)) — mineral

Citrine Quartz

Silicon Dioxide (SiO2)

Polished green stone, likely serpentine or altered basalt (Serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄; exact identification requires testing) — metamorphic

Polished green stone, likely serpentine or altered basalt

Serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄; exact identification requires testing

Rose quartz (Quartz (silicon dioxide, SiO₂), pink massive variety) — mineral

Rose quartz

Quartz (silicon dioxide, SiO₂), pink massive variety

Howlite (Howlite, Ca₂B₅SiO₉(OH)₅) — mineral

Howlite

Howlite, Ca₂B₅SiO₉(OH)₅

Tumbled dark stone, possibly chert or basalt (Indeterminate; likely fine-grained basalt (plagioclase–pyroxene) or microcrystalline chert (quartz, SiO₂)) — igneous

Tumbled dark stone, possibly chert or basalt

Indeterminate; likely fine-grained basalt (plagioclase–pyroxene) or microcrystalline chert (quartz, SiO₂)

Milky quartz (Quartz (silicon dioxide, SiO₂)) — mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

Weathered granitic rock (Granitoid, likely biotite granite or granodiorite) — igneous

Weathered granitic rock

Granitoid, likely biotite granite or granodiorite

Tumbled brown stone, likely smoky quartz or brown jasper (Probable smoky quartz (SiO₂) or iron-rich jasper (microcrystalline SiO₂); image alone is insufficient for certainty) — mineral

Tumbled brown stone, likely smoky quartz or brown jasper

Probable smoky quartz (SiO₂) or iron-rich jasper (microcrystalline SiO₂); image alone is insufficient for certainty

Polished amethyst pyramid (Amethyst, purple quartz (SiO₂)) — mineral

Polished amethyst pyramid

Amethyst, purple quartz (SiO₂)

Chalk (Calcite (CaCO3)) — sedimentary

Chalk

Calcite (CaCO3)

Hag Stone (Perforated Sedimentary Rock (typically Sandstone or Siltstone)) — sedimentary

Hag Stone

Perforated Sedimentary Rock (typically Sandstone or Siltstone)

Chert (specifically var. Flint or Jasper-rich Breccia) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (specifically var. Flint or Jasper-rich Breccia)

Microcrystalline Quartz (SiO2)

Quartz (Raw Chunk) (Silicon Dioxide (SiO2)) — mineral

Quartz (Raw Chunk)

Silicon Dioxide (SiO2)

Chert (Commonly known as Flint or Jasper when pigmented) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Commonly known as Flint or Jasper when pigmented)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

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

Agate (Common Chalcedony)

Silicon Dioxide (SiO2)

Limestone Pebble (Calcium Carbonate (CaCO3)) — sedimentary

Limestone Pebble

Calcium Carbonate (CaCO3)

Diamond (as featured in jewelry) (Diamond (C - pure carbon)) — mineral

Diamond (as featured in jewelry)

Diamond (C - pure carbon)