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

Cobalt Glass Slug (Cullet) (Man-made Silicate Glass with Cobalt Oxide (CoO)) — mineraloid

Cobalt Glass Slug (Cullet)

Man-made Silicate Glass with Cobalt Oxide (CoO)

Crackle Glass (Simulated Gemstone) (Amorphous Solid (SiO2)) — man-made glass

Crackle Glass (Simulated Gemstone)

Amorphous Solid (SiO2)

Glass / Silicon Dioxide (Man-made) (SiO2 (Amorphous Silicon Dioxide)) — Amorphous Solid

Glass / Silicon Dioxide (Man-made)

SiO2 (Amorphous Silicon Dioxide)

Amorphous Solid

Obsidian (Volcanic Glass (predominantly SiO2)) — igneous

Obsidian

Volcanic Glass (predominantly SiO2)

Man-made Jewelry (Metal and Glass/Plastic) (Synthetic Alloy and Amorphous Solid (SiO2/Polymer)) — not a rock

Man-made Jewelry (Metal and Glass/Plastic)

Synthetic Alloy and Amorphous Solid (SiO2/Polymer)

Borosilicate Glass (Manufactured) (SiO2 + B2O3 (Silicon dioxide and Boron trioxide)) — Synthetic/Amorphous Solid

Borosilicate Glass (Manufactured)

SiO2 + B2O3 (Silicon dioxide and Boron trioxide)

Synthetic/Amorphous Solid

Sea Glass (Man-made vitreous material) — mineral

Sea Glass

Man-made vitreous material

Ambergris (Ambra grisea (Metabolic byproduct)) — Organic (Geological relative)

Ambergris

Ambra grisea (Metabolic byproduct)

Organic (Geological relative)

Cultured Marble (Synthetic) (Polymer-matrix composite (typically calcium carbonate in polyester resin)) — Synthetic / Composite Material

Cultured Marble (Synthetic)

Polymer-matrix composite (typically calcium carbonate in polyester resin)

Synthetic / Composite Material

Sea Glass (Man-made vitreous material (silica-based glass)) — mineral

Sea Glass

Man-made vitreous material (silica-based glass)

Black Obsidian (Volcanic Glass (SiO2 with impurities)) — igneous

Black Obsidian

Volcanic Glass (SiO2 with impurities)

Anthracite Coal (Anthracite (Carbon-based solid)) — metamorphic

Anthracite Coal

Anthracite (Carbon-based solid)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Obsidian (Volcanic glass) — igneous

Obsidian

Volcanic glass

Copper-bearing Quartz (likely Chrysocolla or Malachite staining) (Cuprite, Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O) or Malachite staining on Quartz/Host Rock) — mineral

Copper-bearing Quartz (likely Chrysocolla or Malachite staining)

Cuprite, Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O) or Malachite staining on Quartz/Host Rock

Yellow Ochre (Limonite) (Limonite (FeO(OH)·nH2O)) — mineral

Yellow Ochre (Limonite)

Limonite (FeO(OH)·nH2O)

Apache Tear (Hydrated Obsidian (Natural Volcanic Glass)) — igneous

Apache Tear

Hydrated Obsidian (Natural Volcanic Glass)

Fossiliferous Limestone (Coquina) (Biogenic Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Fossiliferous Limestone (Coquina)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Blue Slag Glass (Amorphous Silica (Industrial byproduct)) — Antropogenic (Man-made glass byproduct)

Blue Slag Glass

Amorphous Silica (Industrial byproduct)

Antropogenic (Man-made glass byproduct)

Coal (Anthracite or Bituminous) (Lithified plant matter (Carbon)) — sedimentary

Coal (Anthracite or Bituminous)

Lithified plant matter (Carbon)

Coal (Coal (Combustible sedimentary rock)) — sedimentary

Coal

Coal (Combustible sedimentary rock)

Black Obsidian (Volcanic Glass (Amorphous Silicon Dioxide, SiO2)) — igneous

Black Obsidian

Volcanic Glass (Amorphous Silicon Dioxide, SiO2)

Opal (Hydrated Silica (SiO2·nH2O)) — mineral

Opal

Hydrated Silica (SiO2·nH2O)

Obsidian (Volcanic Glass (SiO2)) — igneous

Obsidian

Volcanic Glass (SiO2)

Sodium Polyacrylate (Superabsorbent Polymer) (Sodium Polyacrylate [-CH2-CH(COONa)-]n) — mineral (synthetic)

Sodium Polyacrylate (Superabsorbent Polymer)

Sodium Polyacrylate [-CH2-CH(COONa)-]n

mineral (synthetic)

Opal (Hydrated silica (SiO2 "NH2O)) — mineraloid

Opal

Hydrated silica (SiO2 "NH2O)

Snowflake Obsidian (Spherulitic Obsidian (SiO2 + impurities)) — igneous

Snowflake Obsidian

Spherulitic Obsidian (SiO2 + impurities)

Geode (Unopened) (Silicon Dioxide (SiO2) in sedimentary vugs) — sedimentary

Geode (Unopened)

Silicon Dioxide (SiO2) in sedimentary vugs

Boulder Opal (Amorphous Hydrous Silica (SiO2·nH2O)) — mineral

Boulder Opal

Amorphous Hydrous Silica (SiO2·nH2O)

Obsidian (Obsidian (Amorphous Volcanic Glass, SiO2)) — igneous

Obsidian

Obsidian (Amorphous Volcanic Glass, SiO2)

Obsidian (Volcanic Glass (70-75% SiO2)) — igneous

Obsidian

Volcanic Glass (70-75% SiO2)

Cullet Glass (Industrial Slag Glass) (Amorphous Silica (SiO2) with metallic oxide impurities) — Man-made byproduct (often mistaken for Obsidian or Emerald)

Cullet Glass (Industrial Slag Glass)

Amorphous Silica (SiO2) with metallic oxide impurities

Man-made byproduct (often mistaken for Obsidian or Emerald)

Snowflake Obsidian (Obsidian with Cristobalite inclusions (mostly amorphous SiO2)) — igneous

Snowflake Obsidian

Obsidian with Cristobalite inclusions (mostly amorphous SiO2)

Chondrite Meteorite (Stony Meteorite (L, H, or LL Chondrite)) — igneous

Chondrite Meteorite

Stony Meteorite (L, H, or LL Chondrite)

Amber (Fossilized Tree Resin) — gemstone

Amber

Fossilized Tree Resin

Ambergris (Physeter macrocephalus excreta (Ambergris)) — mineraloid / organic geological find

Ambergris

Physeter macrocephalus excreta (Ambergris)

mineraloid / organic geological find

Ceramic or Polished Stone Heart (Anthropogenic Material) (Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)) — Synthetic/Anthropogenic Mineraloid

Ceramic or Polished Stone Heart (Anthropogenic Material)

Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)

Synthetic/Anthropogenic Mineraloid

Apache Tear (Hydrated Obsidian (Volcanic Glass)) — igneous

Apache Tear

Hydrated Obsidian (Volcanic Glass)

Snowflake Obsidian (Volcanic Glass with Spherulite inclusions (SiO2)) — igneous

Snowflake Obsidian

Volcanic Glass with Spherulite inclusions (SiO2)

Snowflake Obsidian (Volcanic Glass (SiO2) with Cristobalite inclusions) — igneous

Snowflake Obsidian

Volcanic Glass (SiO2) with Cristobalite inclusions

Apache Tear (Obsidian (Hydrated Volcanic Glass) - SiO2 (with impurities)) — igneous

Apache Tear

Obsidian (Hydrated Volcanic Glass) - SiO2 (with impurities)

Limonite/Goethite Concretion (Hydrated Iron(III) Oxide-hydroxide (FeO(OH)·nH2O)) — sedimentary

Limonite/Goethite Concretion

Hydrated Iron(III) Oxide-hydroxide (FeO(OH)·nH2O)