Rock Identifier

Category

Not A Natural Rock

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

Learn about Not A Natural Rock in the encyclopedia

Asphalt Rock

Rock Gypsum

Coral Rock

Rock Salt

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Chalk

Obsidian

Baddeleyite

Cataclasite

Anorthosite

Kimberlite

Diamond (Carbon (C)) — mineral

Diamond

Carbon (C)

Diamond (Cubic Carbon (C)) — mineral

Diamond

Cubic Carbon (C)

Pearl (Aragonite / Calcium Carbonate (CaCO3)) — mineral

Pearl

Aragonite / Calcium Carbonate (CaCO3)

Diamond (in jewelry) (Carbon (C)) — mineral

Diamond (in jewelry)

Carbon (C)

Pearl (nacre) (Calcium Carbonate (mostly CaCO3 as Aragonite) and Conchiolin) — Organic Mineraloid

Pearl (nacre)

Calcium Carbonate (mostly CaCO3 as Aragonite) and Conchiolin

Organic Mineraloid

Garnet (Garnet (X3Y2(SiO4)3)) — mineral

Garnet

Garnet (X3Y2(SiO4)3)

Diamond in Kimberlite (Diamond (C in Kimberlite)) — igneous

Diamond in Kimberlite

Diamond (C in Kimberlite)

Diamond (Carbon (C) - Native Element) — mineral

Diamond

Carbon (C) - Native Element

Diamond (Carbon (C)) — mineral

Diamond

Carbon (C)

Orange Quartzite (Quartzite (primarily SiO2 with Hematite impurities)) — metamorphic

Orange Quartzite

Quartzite (primarily SiO2 with Hematite impurities)

Tumbled banded calcite (often sold as “onyx” or green onyx) (Calcite, CaCO₃; commonly banded cave/travertine calcite) — mineral

Tumbled banded calcite (often sold as “onyx” or green onyx)

Calcite, CaCO₃; commonly banded cave/travertine calcite

Limonitic Scoria (Vesicular Basalt with Iron Staining) (Highly vesicular basalt heavily stained by Limonite [FeO(OH)·nH2O]) — igneous

Limonitic Scoria (Vesicular Basalt with Iron Staining)

Highly vesicular basalt heavily stained by Limonite [FeO(OH)·nH2O]

Blue Goldstone (Aventurine Glass (SiO2 with Cobalt/Copper inclusions)) — man-made glass

Blue Goldstone

Aventurine Glass (SiO2 with Cobalt/Copper inclusions)

Quartzite (Quartzite) — Metamorphic

Quartzite

Quartzite

Blue chalcedony cabochon (probable) (Chalcedony, cryptocrystalline quartz; silicon dioxide (SiO₂)) — gemstone

Blue chalcedony cabochon (probable)

Chalcedony, cryptocrystalline quartz; silicon dioxide (SiO₂)

Strawberry Quartz (or Rose Quartz / Cherry Quartz) (Silicon Dioxide (SiO2) with Lepidocrocite, Hematite, or Goethite inclusions) — mineral

Strawberry Quartz (or Rose Quartz / Cherry Quartz)

Silicon Dioxide (SiO2) with Lepidocrocite, Hematite, or Goethite inclusions

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Citrine Quartz (Silicon dioxide (SiO2)) — mineral

Citrine Quartz

Silicon dioxide (SiO2)

Aura Quartz (Titanium/Bismuth Coated) (Silicon Dioxide (SiO2) with metallic vapor coating) — mineral

Aura Quartz (Titanium/Bismuth Coated)

Silicon Dioxide (SiO2) with metallic vapor coating

Dyed Agate (Chalcedony (SiO2)) — mineral

Dyed Agate

Chalcedony (SiO2)

Dyed Purple Agate Sliced Tablet (Silicon Dioxide (SiO2), variety Chalcedony) — gemstone

Dyed Purple Agate Sliced Tablet

Silicon Dioxide (SiO2), variety Chalcedony

Turquoise (Blue Howlite / Magnesite imitation) (CuAl6(PO4)4(OH)8·4H2O (for natural Turquoise); Ca2B5SiO9(OH)5 (for Howlite)) — mineral

Turquoise (Blue Howlite / Magnesite imitation)

CuAl6(PO4)4(OH)8·4H2O (for natural Turquoise); Ca2B5SiO9(OH)5 (for Howlite)

Hematite (Iron(III) oxide (Fe2O3)) — mineral

Hematite

Iron(III) oxide (Fe2O3)

Citrine (Silicon dioxide (SiO2)) — mineral

Citrine

Silicon dioxide (SiO2)

Pink Stained Rock (Likely Quartzite or Sandstone with Iron Oxide Staining) (Quartzite (metamorphic) or Sandstone (sedimentary); coloration likely due to hematite or other iron oxides.) — Metamorphic or Sedimentary (with staining)

Pink Stained Rock (Likely Quartzite or Sandstone with Iron Oxide Staining)

Quartzite (metamorphic) or Sandstone (sedimentary); coloration likely due to hematite or other iron oxides.

Metamorphic or Sedimentary (with staining)

Snowflake Obsidian (Vitreous volcanic silicate (SiO2 with Cristobalite inclusions)) — Igneous

Snowflake Obsidian

Vitreous volcanic silicate (SiO2 with Cristobalite inclusions)

Asphalt (Bituminous Concrete) (Bituminous Concrete / Pavement) — man-made (synthetic rock)

Asphalt (Bituminous Concrete)

Bituminous Concrete / Pavement

man-made (synthetic rock)

Citrine Quartz (Silicon Dioxide (SiO2)) — mineral

Citrine Quartz

Silicon Dioxide (SiO2)

Banded metamorphic rock, likely mica schist or gneiss (Quartz–feldspar–mica schist/gneiss; exact identification requires a fresh surface and mineral tests) — metamorphic

Banded metamorphic rock, likely mica schist or gneiss

Quartz–feldspar–mica schist/gneiss; exact identification requires a fresh surface and mineral tests

Citrine (Silicon Dioxide (SiO2)) — mineral

Citrine

Silicon Dioxide (SiO2)

Magnetic Hematite (Man-made) (Iron Oxide (Fe2O3) with Barium-Strontium Ferrite) — mineral

Magnetic Hematite (Man-made)

Iron Oxide (Fe2O3) with Barium-Strontium Ferrite

K2 Stone (or K2 Jasper) (Azurite-in-Granite (Potassium Feldspar, Quartz, Plagioclase, Muscovite, and Azurite)) — igneous

K2 Stone (or K2 Jasper)

Azurite-in-Granite (Potassium Feldspar, Quartz, Plagioclase, Muscovite, and Azurite)

Diamond (or Diamond Simulant) (Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia - ZrO2, Moissanite - SiC)) — gemstone

Diamond (or Diamond Simulant)

Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia - ZrO2, Moissanite - SiC)

Dyed Quartzite (Tumbled Metamorphosed Quartz (SiO2) with artificial pigment) — metamorphic

Dyed Quartzite

Tumbled Metamorphosed Quartz (SiO2) with artificial pigment

Gold (Elemental Metal) (Gold (Au)) — Mineral

Gold (Elemental Metal)

Gold (Au)

Limonite and Goethite Iron Ore (Hydrated Iron Oxide Hydroxide (FeO(OH)·nH2O)) — mineral

Limonite and Goethite Iron Ore

Hydrated Iron Oxide Hydroxide (FeO(OH)·nH2O)

Limonite (FeO(OH)•nH2O) — mineral

Limonite

FeO(OH)•nH2O

Obsidian (Obsidian (Volcanic Glass, SiO2 + impurity)) — igneous

Obsidian

Obsidian (Volcanic Glass, SiO2 + impurity)

Blue Howlite (Dyed Howlite (Ca2B5SiO9(OH)5)) — mineral

Blue Howlite

Dyed Howlite (Ca2B5SiO9(OH)5)

Citrine Quartz (Silicon Dioxide (SiO2)) — mineral

Citrine Quartz

Silicon Dioxide (SiO2)

Quartz (Citrine variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Citrine variety)

Silicon Dioxide (SiO2)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities