Rock Identifier

Category

Synthetic (Not A Natural Rock)

Browse synthetic (not a natural rock) specimens identified by the Rock Identifier community.

Learn about Synthetic (Not A Natural Rock) in the encyclopedia

Asphalt Rock

Yttrium Aluminum Garnet

Yttrium Aluminum Garnet

Chalk

Zircon

Obsidian

Kimberlite

Emerald in Matrix

Emerald in Matrix

Tripolite

Guano

Halite

Aquamarine Matrix

Aquamarine Matrix

Rock Salt

Diamond (Carbon (C)) — gemstone

Diamond

Carbon (C)

Polymictic conglomerate or breccia (possibly concrete-like aggregate) (Lithified polymictic gravel; clasts may include basalt, granite, quartzite, and other silicates) — sedimentary

Polymictic conglomerate or breccia (possibly concrete-like aggregate)

Lithified polymictic gravel; clasts may include basalt, granite, quartzite, and other silicates

Sandstone (likely Arkosic) (Clastic Sedimentary Rock (primarily SiO2 with Feldspar)) — sedimentary

Sandstone (likely Arkosic)

Clastic Sedimentary Rock (primarily SiO2 with Feldspar)

Brecciated Jasper (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Brecciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Smoky Quartz and Chalcedony Geode Fragment (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz and Chalcedony Geode Fragment

Silicon Dioxide (SiO2)

Sandstone (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Ruby (Corundum (Al2O3 with Chromium traces)) — mineral

Ruby

Corundum (Al2O3 with Chromium traces)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Concrete / Anthropogenic Conglomerate (Man-made composite material (Portland cement, aggregate, and water)) — not a natural rock

Concrete / Anthropogenic Conglomerate

Man-made composite material (Portland cement, aggregate, and water)

not a natural rock

Granite Pebble (Phaneritic intrusive igneous rock) — igneous

Granite Pebble

Phaneritic intrusive igneous rock

Sandstone (Arenite (Siliclastic sedimentary rock)) — sedimentary

Sandstone

Arenite (Siliclastic sedimentary rock)

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

Yellow Quartz (Citrine Quartz Pebble)

Silicon Dioxide (SiO2)

Painted Garden Rock (Coated Siltstone or Mudstone) — sedimentary

Painted Garden Rock

Coated Siltstone or Mudstone

Limonite (Iron Ore) (Hydrous ferric oxides (FeO(OH)·nH2O)) — mineral

Limonite (Iron Ore)

Hydrous ferric oxides (FeO(OH)·nH2O)

Sandstone (Arenite (primarily Quartz-rich)) — sedimentary

Sandstone

Arenite (primarily Quartz-rich)

Agate (Silicon dioxide (Chalcedony), SiO2) — sedimentary

Agate

Silicon dioxide (Chalcedony), SiO2

Polished amber (Amber (fossilized plant resin; commonly succinite, not a mineral)) — gemstone

Polished amber

Amber (fossilized plant resin; commonly succinite, not a mineral)

Granite (Granite) — igneous

Granite

Granite

Green glassy mineral specimen, likely rough emerald or green fluorite (Tentatively beryl (Be₃Al₂Si₆O₁₈), emerald variety; synthetic/man-made glass cannot be excluded from the photograph) — mineral

Green glassy mineral specimen, likely rough emerald or green fluorite

Tentatively beryl (Be₃Al₂Si₆O₁₈), emerald variety; synthetic/man-made glass cannot be excluded from the photograph

Vesicular Basalt (or Scoria) (Vesicular Basalt) — igneous

Vesicular Basalt (or Scoria)

Vesicular Basalt

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Earth (Terra / Earth) — igneous, sedimentary, and metamorphic

Earth

Terra / Earth

igneous, sedimentary, and metamorphic

Dyed Agate (Tumbled) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — mineral

Dyed Agate (Tumbled)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Weathered stone nodule or concretion (Unidentified lithic concretion; composition cannot be determined from the image) — sedimentary

Weathered stone nodule or concretion

Unidentified lithic concretion; composition cannot be determined from the image

Blue Chalcedony (likely dyed Agate) (Silicon Dioxide (SiO₂)) — mineral

Blue Chalcedony (likely dyed Agate)

Silicon Dioxide (SiO₂)

Shale (Clastic sedimentary rock (primarily clay and silt minerals)) — sedimentary

Shale

Clastic sedimentary rock (primarily clay and silt minerals)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Agate (Water-Worn) (Cryptocrystalline quartz (SiO2)) — sedimentary

Agate (Water-Worn)

Cryptocrystalline quartz (SiO2)

Amethyst (Silicon dioxide (SiO2)) — mineral

Amethyst

Silicon dioxide (SiO2)

Light-gray river pebble (Indeterminate; likely fine-grained quartz-rich rock such as quartzite or pale granite) — igneous

Light-gray river pebble

Indeterminate; likely fine-grained quartz-rich rock such as quartzite or pale granite

Dyed Agate (Agate (Silicon dioxide)) — Mineral

Dyed Agate

Agate (Silicon dioxide)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Opalite (Man-made Glass) (Fused glass (typically made of dolomite and metal opacifiers)) — Man-made Material / Glass

Opalite (Man-made Glass)

Fused glass (typically made of dolomite and metal opacifiers)

Man-made Material / Glass

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

River Cobble (Quartzite) (Meta-orthoquartzite) — metamorphic

River Cobble (Quartzite)

Meta-orthoquartzite

Sandstone (Quartzose) (Sandstone (clastic sedimentary rock, primarily SiO2)) — sedimentary

Sandstone (Quartzose)

Sandstone (clastic sedimentary rock, primarily SiO2)

Sandstone (Clastic Sedimentary Rock) — sedimentary

Sandstone

Clastic Sedimentary Rock

Uncertain fine-grained rock or mineral-bearing specimen (Indeterminate; possible quartz- or feldspar-bearing matrix with reflective grains) — mineral

Uncertain fine-grained rock or mineral-bearing specimen

Indeterminate; possible quartz- or feldspar-bearing matrix with reflective grains

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)