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

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

Citrine Quartz Crystal Cluster

Silicon Dioxide (SiO2) with iron impurities

Ruby (Raw Corundum) (Corundum (Al2O3 with Chromium impurities)) — mineral

Ruby (Raw Corundum)

Corundum (Al2O3 with Chromium impurities)

Green Aventurine (Quartz (SiO2) with fuchsite inclusions) — mineral

Green Aventurine

Quartz (SiO2) with fuchsite inclusions

Green Aventurine (Quartzite with Fuchsite inclusions (SiO2 with K(Al,Cr)2AlSi3O10(OH)2)) — metamorphic

Green Aventurine

Quartzite with Fuchsite inclusions (SiO2 with K(Al,Cr)2AlSi3O10(OH)2)

Peacock ore (bornite/chalcopyrite specimen) (Bornite, Cu₅FeS₄, commonly with chalcopyrite (CuFeS₂)) — mineral

Peacock ore (bornite/chalcopyrite specimen)

Bornite, Cu₅FeS₄, commonly with chalcopyrite (CuFeS₂)

Rounded granitic gneiss pebble (Felsic orthogneiss, composed mainly of quartz, feldspar, and mica) — metamorphic

Rounded granitic gneiss pebble

Felsic orthogneiss, composed mainly of quartz, feldspar, and mica

Quartz Pebble (Silica (SiO2)) — mineral

Quartz Pebble

Silica (SiO2)

Yellow Quartz (Golden Quartz) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Golden Quartz)

Silicon Dioxide (SiO2)

Fossilized Shark Tooth (Otodus obliquus (Mackerel Shark)) — sedimentary

Fossilized Shark Tooth

Otodus obliquus (Mackerel Shark)

Blue lace agate (tumbled) (Microcrystalline quartz, SiO₂ (chalcedony variety)) — mineral

Blue lace agate (tumbled)

Microcrystalline quartz, SiO₂ (chalcedony variety)

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

Gemstones (Emerald and Yellow Topaz or Citrine) (Beryl (Be3Al2Si6O18) and Quartz (SiO2) or Topaz (Al2SiO4(F,OH)2)) — mineral

Gemstones (Emerald and Yellow Topaz or Citrine)

Beryl (Be3Al2Si6O18) and Quartz (SiO2) or Topaz (Al2SiO4(F,OH)2)

Diamond (Faceted) (Diamond (Carbon, C)) — mineral

Diamond (Faceted)

Diamond (Carbon, C)

Diamond (faceted) (Carbon (C)) — gemstone

Diamond (faceted)

Carbon (C)

Dyed blue quartz or druzy geode (likely) (Quartz, silicon dioxide (SiO₂), probably artificially colored) — mineral

Dyed blue quartz or druzy geode (likely)

Quartz, silicon dioxide (SiO₂), probably artificially colored

Polished blue banded agate slice (Chalcedony (microcrystalline quartz), SiO₂, commonly with trace iron and other coloring elements) — mineral

Polished blue banded agate slice

Chalcedony (microcrystalline quartz), SiO₂, commonly with trace iron and other coloring elements

Rough Black Diamond (Bort / Carbonado) (Diamond (C)) — mineral

Rough Black Diamond (Bort / Carbonado)

Diamond (C)

Diamond (Carbon (C)) — gemstone

Diamond

Carbon (C)

Magnetite (Magnetite (Fe3O4)) — mineral

Magnetite

Magnetite (Fe3O4)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Rough Sapphire (Corundum (Al2O3)) — mineral

Rough Sapphire

Corundum (Al2O3)

Turquoise (CuAl6(PO4)4(OH)8·4H2O) — mineral

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Hag Stone (Flint with natural hole) (Silicon Dioxide (SiO2) - Nodular Chert / Flint) — sedimentary

Hag Stone (Flint with natural hole)

Silicon Dioxide (SiO2) - Nodular Chert / Flint

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Tumbled jasper pebble (Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities) — mineral

Tumbled jasper pebble

Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities

Rough Diamond (Diamond (Native Carbon, C)) — mineral

Rough Diamond

Diamond (Native Carbon, C)

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

Smoky Quartz with Milky Quartz

Silicon Dioxide (SiO2)

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

Amethyst Quartz

Silicon Dioxide (SiO2) with iron impurities

Weathered, porous limestone (probable fossiliferous limestone) (Calcite-rich limestone; predominantly CaCO₃) — sedimentary

Weathered, porous limestone (probable fossiliferous limestone)

Calcite-rich limestone; predominantly CaCO₃

Amethyst (Silicon Dioxide (SiO2) with trace Iron (Fe3+)) — mineral

Amethyst

Silicon Dioxide (SiO2) with trace Iron (Fe3+)

Amethyst (Polished/Carved Crystal) (Silicon Dioxide (SiO2) with trace Iron (Fe)) — mineral

Amethyst (Polished/Carved Crystal)

Silicon Dioxide (SiO2) with trace Iron (Fe)

Sand (Siliciclastic sediment / Quartz sand (SiO2)) — sedimentary

Sand

Siliciclastic sediment / Quartz sand (SiO2)

Lepidolite (K(Li,Al)3(Si,Al)4O10(F,OH)2) — mineral

Lepidolite

K(Li,Al)3(Si,Al)4O10(F,OH)2

Carnelian and Dyed Agate (Chalcedony (Silicon Dioxide, SiO2)) — mineral

Carnelian and Dyed Agate

Chalcedony (Silicon Dioxide, SiO2)

Chert or heavily weathered flint (Microcrystalline quartz (SiO₂), likely chert/flint) — sedimentary

Chert or heavily weathered flint

Microcrystalline quartz (SiO₂), likely chert/flint

Amethyst (Quartz (SiO2) with iron impurities) — mineral

Amethyst

Quartz (SiO2) with iron impurities

Green Aventurine (Quartzite with Fuchsite (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)) — metamorphic

Green Aventurine

Quartzite with Fuchsite (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Fulgurite (Sand-tube) (Fulgurite (Lechatelierite-rich fused sand)) — metamorphic

Fulgurite (Sand-tube)

Fulgurite (Lechatelierite-rich fused sand)

Red Jasper (Jasper (Silicon Dioxide, SiO2)) — sedimentary

Red Jasper

Jasper (Silicon Dioxide, SiO2)

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

Rose Quartz and Milky Quartz

Silicon Dioxide (SiO2)

Coquina (Limestone) (Bioclastic Limestone (CaCO3)) — sedimentary

Coquina (Limestone)

Bioclastic Limestone (CaCO3)

Tumbled smoky quartz with iron-stained inclusions (Quartz (SiO₂), likely smoky quartz variety) — mineral

Tumbled smoky quartz with iron-stained inclusions

Quartz (SiO₂), likely smoky quartz variety