Not A Rock (Man Made Origin)

Browse not a rock (man made origin) specimens identified by the Rock Identifier community.

Chert

Silicon dioxide (SiO2)

Sedimentary

Bauxite (Pisolitic Bauxite)

Bauxite (mixture of Hydrous Aluminum Oxides)

sedimentary

Chert (Flint)

Silicon Dioxide (SiO2)

sedimentary

Artificial Rock Face (Faux Rock)

Glass Fiber Reinforced Concrete (GFRC)

man-made/construction material

Slag (Industrial Glass/Metal)

Ferrous slag or Glassy silicate byproduct

Antropogenic rock (Man-made)

Sandstone

Clastic sedimentary rock (primarily SiO2)

sedimentary

Sandstone

Arenite (variable SiO2 composition)

sedimentary

Chalk

Carbonate rock (mainly CaCO3)

sedimentary

Blue Sapphire

Corundum (Al2O3 - Aluminum Oxide)

mineral

Asphalt Chunk (with aggregate)

Bituminous concrete / Anthropogenic conglomerate

sedimentary (anthropogenic/man-made conglomerate)

Bivalve Fossil (Shell Fragment)

Class Bivalvia (Calcium Carbonate - CaCO3)

sedimentary

Chalk

Calcium Carbonate (CaCO3)

sedimentary

Lapis Lazuli (polished cabochon)

Lazurite-rich metamorphic rock (approx. Na6Ca2Al6Si6O24(SO4,S,Cl)2)

metamorphic

Granite

Phaneritic Felsic Igneous Rock

igneous

Turquoise

Turquoise (Hydrated phosphate of copper and aluminium) - CuAl6(PO4)4(OH)8·4H2O

mineral

Ferruginous Sandstone with Quartz Inclusions

Clastic Sedimentary Rock (Iron-rich Sandstone)

sedimentary

Blue Sapphire

Corundum (Al2O3) with traces of Iron and Titanium

mineral

Chondrite Meteorite

Stony Meteorite (Chondrite)

igneous

Lapis Lazuli (Raw Ore)

Na8[Al6Si6O24]n(S,Cl,SO4,OH)2 (Lazurite component)

metamorphic

Nuummite

Nuummite (Ortho-amphibole rock, primarily Anthophyllite and Gedrite)

metamorphic

Clay Brick

Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)

metamorphic (man-made/anthropogenic)

Lapis Lazuli

Na8(Al6Si6O24)S2 (composed primarily of Lazurite, Calcite, and Pyrite)

metamorphic

Fluorite

Calcium Fluoride (CaF2)

mineral

Fluorite

Calcium Fluoride (CaF2)

mineral

Fluorite

Calcium Fluoride (CaF2)

mineral

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

mineral

Fluorite

Calcium Fluoride (CaF2)

mineral

Druzy Quartz (on Geode Fragment)

Silicon Dioxide (SiO2)

mineral

Pearl

Calcium Carbonate (CaCO3) - mainly Aragonite and Calcite

mineral

Bauxite

Bauxite (Mixture including Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))

sedimentary

Lapis Lazuli

Lapis Lazuli (Primary mineral: Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)

metamorphic

Cullet Glass (Strawberry Glass)

Amorphous Silicon Dioxide (SiO2) with metallic dopants

Mineraloid (Synthetic/Man-made)

Nickel coin (U.S. currency)

Cupronickel (75% Copper, 25% Nickel alloy)

man-made alloy (metallic)

Sandstone

Arenite (primarily SiO2)

sedimentary

Sandstone (likely Quartzose)

Clastic sedimentary rock (SiO2 primary)

sedimentary

Granodiorite with Quartz Veining

Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins

igneous

Pink Sapphire

Corundum (Al2O3 with trace Chromium and Iron)

mineral

Chondrite Meteorite

L or H type Ordinary Chondrite

igneous

Snowflake Obsidian

Volcanic glass with Cristobalite inclusions (70–75% SiO2)

igneous

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Sedimentary rock

Sandstone

Arenite (SiO2 based typically)

sedimentary

Sandstone (specifically Arkose or Quartz Arenite)

Arenite (primarily SiO2 with possible Feldspar)

sedimentary