Rock Identifier

Category

Amorphous Solid

Browse amorphous solid specimens identified by the Rock Identifier community.

Learn about Amorphous Solid in the encyclopedia

Tripolite

Rainbow Obsidian

Rainbow Obsidian

Oil Shale

Apache Tears

Grandite Garnet

Geyserite

Gold Sheen Obsidian

Black Obsidian

Diatomaceous Earth

Shungite

Flame Obsidian

Smoky Obsidian

Rose quartz (Quartz (silicon dioxide, SiO₂), pink massive variety) — mineral

Rose quartz

Quartz (silicon dioxide, SiO₂), pink massive variety

Polished green aventurine (probable) (Quartz, SiO₂, with green fuchsite or chlorite inclusions) — mineral

Polished green aventurine (probable)

Quartz, SiO₂, with green fuchsite or chlorite inclusions

Milky quartz (Quartz, silicon dioxide (SiO₂)) — mineral

Milky quartz

Quartz, silicon dioxide (SiO₂)

Polished fossilized ammonite or nautiloid shell (Ammonoidea or Nautiloidea; originally aragonitic shell, commonly replaced by calcite or chalcedony) — fossil

Polished fossilized ammonite or nautiloid shell

Ammonoidea or Nautiloidea; originally aragonitic shell, commonly replaced by calcite or chalcedony

Tumbled milky quartz (likely) (Quartz, silicon dioxide (SiO₂)) — mineral

Tumbled milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Orbicular/porphyritic granite or granitic pegmatite (Quartz–feldspar–mica granitic rock, possibly orbicular granite) — igneous

Orbicular/porphyritic granite or granitic pegmatite

Quartz–feldspar–mica granitic rock, possibly orbicular granite

Fossil shark teeth (Probably fossilized shark teeth, possibly *Otodus* or *Carcharhinus* species) — fossil

Fossil shark teeth

Probably fossilized shark teeth, possibly *Otodus* or *Carcharhinus* species

Milky quartz (likely) (Quartz, silicon dioxide (SiO₂)) — mineral

Milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Tumbled jasper, likely ocean jasper (Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and other mineral inclusions) — mineral

Tumbled jasper, likely ocean jasper

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and other mineral inclusions

White quartz pebble (Quartz (silicon dioxide, SiO₂)) — mineral

White quartz pebble

Quartz (silicon dioxide, SiO₂)

Peacock Ore (Bornite (Cu5FeS4) with surface tarnish) — mineral

Peacock Ore

Bornite (Cu5FeS4) with surface tarnish

Diorite (Dalmatian Stone) (Diorite (Intermediate Plutonic Rock)) — igneous

Diorite (Dalmatian Stone)

Diorite (Intermediate Plutonic Rock)

Selenite (Satin Spar Variety) (Gypsum (CaSO4·2H2O)) — mineral

Selenite (Satin Spar Variety)

Gypsum (CaSO4·2H2O)

Rose Quartz (Silicon Dioxide (SiO2)) — mineral

Rose Quartz

Silicon Dioxide (SiO2)

Banded Gneiss (Gneiss (High-grade Metamorphic Rock)) — metamorphic

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Green Quartzite (with Fuchsite) (Quartzite with Muscovite variety Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)) — metamorphic

Green Quartzite (with Fuchsite)

Quartzite with Muscovite variety Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)

Diorite (Polished River Pebble) (Diorite (Intermediate intrusive igneous rock)) — igneous

Diorite (Polished River Pebble)

Diorite (Intermediate intrusive igneous rock)

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

Red Jasper (Tumbled)

Silicon Dioxide (SiO2) with iron oxide inclusions

Satin Spar Selenite (Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O) — mineral

Satin Spar Selenite

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Yellow Aventurine (Silica (SiO2) with inclusions) — mineral

Yellow Aventurine

Silica (SiO2) with inclusions

Tiger’s eye (Chatoyant quartz (fibrous quartz pseudomorph after crocidolite), SiO₂) — gemstone

Tiger’s eye

Chatoyant quartz (fibrous quartz pseudomorph after crocidolite), SiO₂

Unakite-like jasper / epidote–feldspar rock (Epidote–feldspar–quartz aggregate; commonly marketed as unakite or brecciated jasper) — metamorphic

Unakite-like jasper / epidote–feldspar rock

Epidote–feldspar–quartz aggregate; commonly marketed as unakite or brecciated jasper

Dyed Tumbled Quartz (Dragon's Vein Agate/Quartz) (Silicon Dioxide (SiO2) with artificial dye) — mineral

Dyed Tumbled Quartz (Dragon's Vein Agate/Quartz)

Silicon Dioxide (SiO2) with artificial dye

Green Granite / Verd Antique (Serpentinite / Metasomatized Peridotite) — metamorphic

Green Granite / Verd Antique

Serpentinite / Metasomatized Peridotite

Peacock Ore (Bornite (Cu5FeS4)) — mineral

Peacock Ore

Bornite (Cu5FeS4)

Quartz (Orangey-Yellow variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Orangey-Yellow variety)

Silicon Dioxide (SiO2)

Strawberry Quartz (Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)) — mineral

Strawberry Quartz

Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)

Howlite (Dyed Turquoise) (Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)) — mineral

Howlite (Dyed Turquoise)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Peacock Ore (Bornite/Chalcopyrite) (Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2)) — mineral

Peacock Ore (Bornite/Chalcopyrite)

Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2)

Peacock Ore (Bornite (Cu5FeS4) or iridescent Chalcopyrite (CuFeS2)) — mineral

Peacock Ore

Bornite (Cu5FeS4) or iridescent Chalcopyrite (CuFeS2)

Howlite (Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)) — mineral

Howlite

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Satin Spar (Selenite) (Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O) — mineral

Satin Spar (Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Turquenite (Dyed Howlite) (Dyed Ca2B5SiO9(OH)5 (Calcium Borosilicate Hydroxide)) — mineral

Turquenite (Dyed Howlite)

Dyed Ca2B5SiO9(OH)5 (Calcium Borosilicate Hydroxide)

Vesicular Basalt / Scoria (Stream-rounded Cobble) (Mafic extrusive igneous rock) — igneous

Vesicular Basalt / Scoria (Stream-rounded Cobble)

Mafic extrusive igneous rock

Moonstone (Feldspar) (Orthoclase/Albite ((K,Na)AlSi3O8)) — mineral

Moonstone (Feldspar)

Orthoclase/Albite ((K,Na)AlSi3O8)

Banded Calcite (often sold as 'Mexican Onyx' or 'Calcite Onyx') (Calcite (Calcium Carbonate, CaCO3)) — sedimentary

Banded Calcite (often sold as 'Mexican Onyx' or 'Calcite Onyx')

Calcite (Calcium Carbonate, CaCO3)

Banded Calcite (often sold as Mexican Onyx) (Calcium Carbonate (CaCO3)) — sedimentary

Banded Calcite (often sold as Mexican Onyx)

Calcium Carbonate (CaCO3)

Banded Calcite (often sold as 'Mexican Onyx') (Calcite (Calcium Carbonate - CaCO3)) — sedimentary

Banded Calcite (often sold as 'Mexican Onyx')

Calcite (Calcium Carbonate - CaCO3)

Blue Calcite (commonly sold as Caribbean Calcite) (Calcium Carbonate (CaCO3)) — mineral

Blue Calcite (commonly sold as Caribbean Calcite)

Calcium Carbonate (CaCO3)

Ruby in Fuchsite (often sold as Ruby in Zoisite) (Corundum (Al2O3) in Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)) — metamorphic

Ruby in Fuchsite (often sold as Ruby in Zoisite)

Corundum (Al2O3) in Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Banded Calcite (often sold as Orange Onyx or Mexican Onyx) (Calcium Carbonate (CaCO3)) — sedimentary

Banded Calcite (often sold as Orange Onyx or Mexican Onyx)

Calcium Carbonate (CaCO3)

Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx') (Calcite (Calcium Carbonate, CaCO3)) — sedimentary

Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')

Calcite (Calcium Carbonate, CaCO3)