Rock Identifier

Category

Not A Natural Rock (Man Made Composite)

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

Learn about Not A Natural Rock (Man Made Composite) in the encyclopedia

Asphalt Rock

Rock Gypsum

Talc-carbonate Rock

Talc-carbonate Rock

Opalite

Chalk

Goldstone

Anorthosite

Albitite

Dunite

Gondite

Limestone

Coquina

Citrine (Heat-treated Amethyst) (Quartz (Silicon Dioxide, SiO2)) — mineral

Citrine (Heat-treated Amethyst)

Quartz (Silicon Dioxide, SiO2)

Chert (Black Chert or Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Black Chert or Flint)

Silicon Dioxide (SiO2)

Pebble (likely Limestone or Siltstone) (Lithic fragment (calcareous or siliciclastic)) — sedimentary

Pebble (likely Limestone or Siltstone)

Lithic fragment (calcareous or siliciclastic)

Citrine (Silicon Dioxide (SiO2)) — mineral

Citrine

Silicon Dioxide (SiO2)

Amethyst Cluster (Silicon Dioxide (Quartz variety), SiO2) — mineral

Amethyst Cluster

Silicon Dioxide (Quartz variety), SiO2

Smoky Quartz (Silicon Dioxide (SiO2) with natural radiation induced color centers) — mineral

Smoky Quartz

Silicon Dioxide (SiO2) with natural radiation induced color centers

Red jasper (likely iron-rich chalcedony/jasper) (Jasper, microcrystalline quartz (SiO₂), colored mainly by hematite/goethite) — mineral

Red jasper (likely iron-rich chalcedony/jasper)

Jasper, microcrystalline quartz (SiO₂), colored mainly by hematite/goethite

Smoky quartz (likely) (Quartz, silicon dioxide (SiO₂), naturally irradiated variety) — mineral

Smoky quartz (likely)

Quartz, silicon dioxide (SiO₂), naturally irradiated variety

Tumbled blue stone, likely blue aventurine or dyed quartz (Quartz (SiO₂), possibly with fuchsite inclusions; exact identification requires testing) — mineral

Tumbled blue stone, likely blue aventurine or dyed quartz

Quartz (SiO₂), possibly with fuchsite inclusions; exact identification requires testing

Diamond inlaid in Jewelry (Carbon (C)) — mineral

Diamond inlaid in Jewelry

Carbon (C)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Citrine Quartz (Silicon Dioxide (SiO2) with iron impurities) — mineral

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Flint / Chert (Microcrystalline quartz (SiO2)) — sedimentary

Flint / Chert

Microcrystalline quartz (SiO2)

Black Chert River Stone (Cryptocrystalline Quartz (SiO2)) — sedimentary

Black Chert River Stone

Cryptocrystalline Quartz (SiO2)

White Marble (Recrystallized Calcite (CaCO3)) — metamorphic

White Marble

Recrystallized Calcite (CaCO3)

Diamond (Diamond (C)) — mineral

Diamond

Diamond (C)

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

Citrine Quartz (Tumbled)

Silicon Dioxide (SiO2)

Amethyst (Silicon dioxide (variant with ferric iron impurities), SiO2) — mineral

Amethyst

Silicon dioxide (variant with ferric iron impurities), SiO2

Citrine Quartz (Silicon Dioxide (SiO2) with iron impurities) — mineral

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Smoky Quartz (Silicon Dioxide (SiO2)) — gemstone

Smoky Quartz

Silicon Dioxide (SiO2)

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

Citrine

Silicon Dioxide with iron impurities (SiO2)

Citrine (SiO2 (Silicon Dioxide)) — mineral

Citrine

SiO2 (Silicon Dioxide)

Granite Pebble (Granite) — igneous

Granite Pebble

Granite

Polished white agate or chalcedony bead (Microcrystalline quartz (SiO₂), likely chalcedony/agate with iron-oxide staining or a brown mineral inclusion) — gemstone

Polished white agate or chalcedony bead

Microcrystalline quartz (SiO₂), likely chalcedony/agate with iron-oxide staining or a brown mineral inclusion

Citrine (Silicon dioxide (SiO2)) — mineral

Citrine

Silicon dioxide (SiO2)

Tumbled blue-gray stone, likely quartzite or fine-grained basalt (Provisional identification: quartzite (mostly quartz, SiO₂) or basalt (plagioclase–pyroxene); image alone cannot distinguish reliably) — igneous

Tumbled blue-gray stone, likely quartzite or fine-grained basalt

Provisional identification: quartzite (mostly quartz, SiO₂) or basalt (plagioclase–pyroxene); image alone cannot distinguish reliably

Smoky quartz (Quartz (SiO₂), brown-to-gray smoky variety) — mineral

Smoky quartz

Quartz (SiO₂), brown-to-gray smoky variety

Quartz (clear quartz/crystal quartz) (Quartz, silicon dioxide (SiO₂), trigonal crystal system) — mineral

Quartz (clear quartz/crystal quartz)

Quartz, silicon dioxide (SiO₂), trigonal crystal system

Yellow Quartz (Polished) (Silicon Dioxide (SiO2) with iron inclusions) — mineral

Yellow Quartz (Polished)

Silicon Dioxide (SiO2) with iron inclusions

Black Onyx (Cryptocrystalline Quartz (SiO2) with carbon/iron impurities) — mineral/sedimentary

Black Onyx

Cryptocrystalline Quartz (SiO2) with carbon/iron impurities

mineral/sedimentary

Tumbled chalcedony or agate pebble (Microcrystalline quartz (SiO₂), likely chalcedony with possible iron-oxide inclusions) — mineral

Tumbled chalcedony or agate pebble

Microcrystalline quartz (SiO₂), likely chalcedony with possible iron-oxide inclusions

Citrine (Citrine (Silicon Dioxide - SiO2)) — mineral

Citrine

Citrine (Silicon Dioxide - SiO2)

Polished blue sodalite cabochons (Sodalite, Na₈Al₆Si₆O₂₄Cl₂) — mineral

Polished blue sodalite cabochons

Sodalite, Na₈Al₆Si₆O₂₄Cl₂

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

Quartz (Citrine)

Silicon Dioxide (SiO2)

Diamond (Natural Diamond (Carbon, C)) — gemstone

Diamond

Natural Diamond (Carbon, C)

Amethyst on Matrix (Amethyst (Silicon Dioxide, SiO2) with impurities of iron and irradiation) — mineral

Amethyst on Matrix

Amethyst (Silicon Dioxide, SiO2) with impurities of iron and irradiation

Chert (Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (Hagstone / Lucky Stone) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Hagstone / Lucky Stone)

Microcrystalline Quartz (SiO2)

Nephrite Jade (Ca2(Mg,Fe)5Si8O22(OH)2 (Tremolite-Actinolite series)) — metamorphic

Nephrite Jade

Ca2(Mg,Fe)5Si8O22(OH)2 (Tremolite-Actinolite series)

Tektite (Natural impact glass) — meteorite

Tektite

Natural impact glass

Slate (Foliated Metamorphic Slate) — metamorphic

Slate

Foliated Metamorphic Slate

Tumbled pink granite or feldspar-rich granitic pebble (Granite, composed mainly of quartz, potassium feldspar, and plagioclase; exact identification is uncertain from the image) — igneous

Tumbled pink granite or feldspar-rich granitic pebble

Granite, composed mainly of quartz, potassium feldspar, and plagioclase; exact identification is uncertain from the image