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

Grape Agate (Botryoidal Amethystine Chalcedony (SiO2)) — mineral

Grape Agate

Botryoidal Amethystine Chalcedony (SiO2)

Lepidodendron Fossil (Scale Tree) (Lepidodendron) — fossil

Lepidodendron Fossil (Scale Tree)

Lepidodendron

Chalcedony (Agate/Chert variety) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Agate/Chert variety)

Silicon Dioxide (SiO2)

Basalt (River Cobble) (Basalt) — igneous

Basalt (River Cobble)

Basalt

Quartzite Pebble (Meta-quartzite) — metamorphic

Quartzite Pebble

Meta-quartzite

Quartz pebble (Silicon dioxide (SiO2)) — mineral

Quartz pebble

Silicon dioxide (SiO2)

Quartz-bearing rock fragment (Likely quartz (SiO₂) with iron-oxide staining and possible host-rock grains) — mineral

Quartz-bearing rock fragment

Likely quartz (SiO₂) with iron-oxide staining and possible host-rock grains

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

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Banded gneiss (weathered glacial erratic) (Gneiss; typically quartz–feldspar–biotite ± hornblende) — metamorphic

Banded gneiss (weathered glacial erratic)

Gneiss; typically quartz–feldspar–biotite ± hornblende

Botryoidal Chalcedony (Quartz Var.) (Silicon Dioxide (SiO2)) — mineral

Botryoidal Chalcedony (Quartz Var.)

Silicon Dioxide (SiO2)

Gold in Quartz (Hydrothermal Quartz with Native Gold (SiO2 with Au)) — mineral

Gold in Quartz

Hydrothermal Quartz with Native Gold (SiO2 with Au)

Chalcedony (River Stone) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (River Stone)

Silicon Dioxide (SiO2)

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

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Siltstone or Mudstone (Siltstone (composed primarily of silt-sized particles)) — sedimentary

Siltstone or Mudstone

Siltstone (composed primarily of silt-sized particles)

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Rose Quartz (Silicon dioxide (SiO2)) — mineral

Rose Quartz

Silicon dioxide (SiO2)

Blue Dyed Agate (Silicon Dioxide (SiO2) with artificial pigment) — mineral

Blue Dyed Agate

Silicon Dioxide (SiO2) with artificial pigment

Dyed Blue Agate Geode Slice (Chalcedony (Silicon Dioxide, SiO2)) — mineral

Dyed Blue Agate Geode Slice

Chalcedony (Silicon Dioxide, SiO2)

Concrete with Aggregate (Composite construction material; primary matrix is Calcium Silicate Hydrate (C-S-H)) — anthropogenic (human-made) sedimentary-like material

Concrete with Aggregate

Composite construction material; primary matrix is Calcium Silicate Hydrate (C-S-H)

anthropogenic (human-made) sedimentary-like material

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Sandstone (with man-made markings) (Arenite (composed primarily of Quartz, SiO2)) — sedimentary

Sandstone (with man-made markings)

Arenite (composed primarily of Quartz, SiO2)

Chalcopyrite in Gossan (Chalcopyrite (CuFeS2) in a Limonite-rich Gossan matrix) — mineral

Chalcopyrite in Gossan

Chalcopyrite (CuFeS2) in a Limonite-rich Gossan matrix

Quartz (Milky/Iron-stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Iron-stained)

Silicon Dioxide (SiO2)

Chert with Asphaltum (or Tar) (Silica (SiO2) with natural Bitumen/Asphaltum) — sedimentary

Chert with Asphaltum (or Tar)

Silica (SiO2) with natural Bitumen/Asphaltum

Likely schist, possibly serpentinite (Mica schist; potential chlorite–serpentine-rich metamorphic rock) — metamorphic

Likely schist, possibly serpentinite

Mica schist; potential chlorite–serpentine-rich metamorphic rock

Citrine Geode Fragment (Silicon Dioxide (SiO2) with iron impurities) — mineral

Citrine Geode Fragment

Silicon Dioxide (SiO2) with iron impurities

Jasper Agate (Chalcedony) (Silicon Dioxide (SiO2)) — sedimentary

Jasper Agate (Chalcedony)

Silicon Dioxide (SiO2)

Agate (Crazy Lace or Eye Agate) (Silicon Dioxide (SiO2)) — mineral

Agate (Crazy Lace or Eye Agate)

Silicon Dioxide (SiO2)

Rose Quartz with Girasol Effect (Silicon Dioxide (SiO2)) — mineral

Rose Quartz with Girasol Effect

Silicon Dioxide (SiO2)

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

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

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

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Agate (Silicon dioxide (SiO2) - variety of chalcedony) — sedimentary

Agate

Silicon dioxide (SiO2) - variety of chalcedony

Ocean Jasper (SiO2 (Silicon Dioxide with impurities)) — mineral

Ocean Jasper

SiO2 (Silicon Dioxide with impurities)

Diamond (Carbon (C)) — gemstone

Diamond

Carbon (C)

Cubic Zirconia (Faceted) (Zirconium dioxide (ZrO2)) — gemstone

Cubic Zirconia (Faceted)

Zirconium dioxide (ZrO2)

Quartz Pebble (Water-Worn) (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble (Water-Worn)

Silicon Dioxide (SiO2)

Agate (SiO2 (Silicon Dioxide - Chalcedony)) — Mineral / Sedimentary

Agate

SiO2 (Silicon Dioxide - Chalcedony)

Mineral / Sedimentary

Diamond (Emerald Cut) (Carbon (C)) — mineral

Diamond (Emerald Cut)

Carbon (C)

Diamond (as set in a gold ring) (Carbon (C)) — mineral

Diamond (as set in a gold ring)

Carbon (C)

Diamond (Native Carbon (C)) — mineral

Diamond

Native Carbon (C)

Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Chert

Microcrystalline Quartz (SiO2)

Quartz with impurities or Host Rock (SiO2 (Silicon Dioxide) with mixed silicates) — mineral

Quartz with impurities or Host Rock

SiO2 (Silicon Dioxide) with mixed silicates