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

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

Dyed Howlite (Turquenite)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Blue Onyx (Dyed Agate) (Cryptocrystalline Quartz (SiO2) with artificial pigment) — mineral

Blue Onyx (Dyed Agate)

Cryptocrystalline Quartz (SiO2) with artificial pigment

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Peacock Ore (Bornite (Cu5FeS4)) — mineral

Peacock Ore

Bornite (Cu5FeS4)

Venetian Gold Granite (Phaneritic Felsic Igneous Rock (Granite)) — igneous

Venetian Gold Granite

Phaneritic Felsic Igneous Rock (Granite)

Bornite (Bornite (Cu5FeS4)) — mineral

Bornite

Bornite (Cu5FeS4)

Bornite (Bornite (Cu5FeS4)) — mineral

Bornite

Bornite (Cu5FeS4)

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

Satin Spar (Selenite)

Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)

Polished orbicular ocean jasper (Silicified volcanic rock; chiefly microcrystalline quartz (SiO₂) with feldspar, chlorite, and iron-oxide inclusions) — mineral

Polished orbicular ocean jasper

Silicified volcanic rock; chiefly microcrystalline quartz (SiO₂) with feldspar, chlorite, and iron-oxide inclusions

Pea Gravel / River Gravel (Unconsolidated Clastic Sedimentary Aggregate) — sedimentary

Pea Gravel / River Gravel

Unconsolidated Clastic Sedimentary Aggregate

Polished green aventurine (likely) (Quartzite dominated by quartz (SiO₂), commonly containing fuchsite mica) — mineral

Polished green aventurine (likely)

Quartzite dominated by quartz (SiO₂), commonly containing fuchsite mica

Soapstone (Steatite (Hydrated magnesium silicate)) — metamorphic

Soapstone

Steatite (Hydrated magnesium silicate)

Yellow Quartz (Citrine or Iron-stained Quartz) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Basalt Pebble (Basaltic Igneous Rock) — igneous

Basalt Pebble

Basaltic Igneous Rock

Glauconitic Sandstone (Glauconitic Sandstone (Greensand)) — sedimentary

Glauconitic Sandstone

Glauconitic Sandstone (Greensand)

River Pebble (likely Quartzite or Diorite) (Metamorphosed Quartz-rich Rock / Intermediate Igneous Rock) — metamorphic

River Pebble (likely Quartzite or Diorite)

Metamorphosed Quartz-rich Rock / Intermediate Igneous Rock

River Pebble (Quartz/Sandstone) (Silicon Dioxide (SiO2) Mix) — sedimentary

River Pebble (Quartz/Sandstone)

Silicon Dioxide (SiO2) Mix

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Brown Pebble (River Rock) (Indeterminate (Likely Silicon Dioxide / Quartz-rich)) — sedimentary

Brown Pebble (River Rock)

Indeterminate (Likely Silicon Dioxide / Quartz-rich)

River Pebble (Greywacke or Siltstone) (Clastic Sedimentary Rock) — sedimentary

River Pebble (Greywacke or Siltstone)

Clastic Sedimentary Rock

River Cobble (likely Quartzite or Limestone) (SiO2 (Quartzite dominant) or CaCO3 (Limestone dominant)) — metamorphic or sedimentary

River Cobble (likely Quartzite or Limestone)

SiO2 (Quartzite dominant) or CaCO3 (Limestone dominant)

metamorphic or sedimentary

Citrine Quartz (Silicon Dioxide (SiO2) with trace Iron) — mineral

Citrine Quartz

Silicon Dioxide (SiO2) with trace Iron

Chalcanthite (Hydrated copper(II) sulfate (CuSO4·5H2O)) — mineral

Chalcanthite

Hydrated copper(II) sulfate (CuSO4·5H2O)

Satin Spar (commonly sold as Selenite) (Hydrous Calcium Sulfate (CaSO4·2H2O)) — mineral

Satin Spar (commonly sold as Selenite)

Hydrous Calcium Sulfate (CaSO4·2H2O)

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

Howlite (Dyed to resemble Turquoise)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

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

Howlite

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

White Moonstone (Feldspar (Orthoclase or Albite), (K,Na)AlSi3O8) — gemstone

White Moonstone

Feldspar (Orthoclase or Albite), (K,Na)AlSi3O8

Yellow Jasper (Limonite-stained Chert) (Silicon Dioxide (SiO2) with Limonite/Goethite inclusions) — sedimentary

Yellow Jasper (Limonite-stained Chert)

Silicon Dioxide (SiO2) with Limonite/Goethite inclusions

Yellow Agate (Agate (Microcrystalline Silicon Dioxide, SiO2)) — mineral

Yellow Agate

Agate (Microcrystalline Silicon Dioxide, SiO2)

Banded Sandstone (Liesegang Rings) (Sedimentary Arenite (SiO2 with FeO/Fe2O3 impurities)) — sedimentary

Banded Sandstone (Liesegang Rings)

Sedimentary Arenite (SiO2 with FeO/Fe2O3 impurities)

Botryoidal hematite (speculative) (Hematite, iron(III) oxide (Fe₂O₃), possibly mixed with goethite or magnetite) — mineral

Botryoidal hematite (speculative)

Hematite, iron(III) oxide (Fe₂O₃), possibly mixed with goethite or magnetite

Tumbled yellow jasper or serpentine (Jasper: microcrystalline quartz (SiO₂); possible serpentine: Mg₃Si₂O₅(OH)₄) — mineral

Tumbled yellow jasper or serpentine

Jasper: microcrystalline quartz (SiO₂); possible serpentine: Mg₃Si₂O₅(OH)₄

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

Green Aventurine

Aventurine Quartz (SiO2 with inclusions)

Green aventurine (likely) (Quartz variety; silicon dioxide (SiO₂) with green fuchsite mica inclusions) — mineral

Green aventurine (likely)

Quartz variety; silicon dioxide (SiO₂) with green fuchsite mica inclusions

Mixed Mineral Collection (with Titanium Aura Quartz) (Silicon Dioxide (SiO2) with metallic coatings and various silicates) — mineral

Mixed Mineral Collection (with Titanium Aura Quartz)

Silicon Dioxide (SiO2) with metallic coatings and various silicates

Crackled Quartz (Blue Dyed) (Silicon Dioxide (SiO2) with anthropogenic dye) — mineral

Crackled Quartz (Blue Dyed)

Silicon Dioxide (SiO2) with anthropogenic dye

Tumbled black-and-white stone, likely dalmatian jasper (Quartz-rich porphyritic rhyolite (commercially called dalmatian jasper), with black aegirine/arfvedsonite-like inclusions) — igneous

Tumbled black-and-white stone, likely dalmatian jasper

Quartz-rich porphyritic rhyolite (commercially called dalmatian jasper), with black aegirine/arfvedsonite-like inclusions

Tumbled blue-gray chalcedony (likely blue agate) (Chalcedony, microcrystalline quartz (SiO₂)) — mineral

Tumbled blue-gray chalcedony (likely blue agate)

Chalcedony, microcrystalline quartz (SiO₂)

Chalcopyrite (Peacock Ore) (Chalcopyrite (CuFeS2)) — mineral

Chalcopyrite (Peacock Ore)

Chalcopyrite (CuFeS2)

Labradorite-bearing anorthosite (Anorthosite, chiefly plagioclase feldspar (labradorite; approximately (Ca,Na)(Al,Si)₄O₈)) — igneous

Labradorite-bearing anorthosite

Anorthosite, chiefly plagioclase feldspar (labradorite; approximately (Ca,Na)(Al,Si)₄O₈)

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

Citrine and Quartz

Silicon Dioxide (SiO2)

Tiger Carving (Banded Onyx or Calcite) (Banded Calcite (CaCO3)) — sedimentary

Tiger Carving (Banded Onyx or Calcite)

Banded Calcite (CaCO3)