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

Blue Goldstone (Aventurine Glass) — Man-made glass (often grouped with minerals in lapidary)

Blue Goldstone

Aventurine Glass

Man-made glass (often grouped with minerals in lapidary)

Obsidian (Obsidian (principally SiO2)) — igneous

Obsidian

Obsidian (principally SiO2)

Dendritic Limestone (Calcite with Manganese Oxide (Manganese Dendrites)) — sedimentary

Dendritic Limestone

Calcite with Manganese Oxide (Manganese Dendrites)

Obsidian (Volcanic glass (high silica content, usually >70% SiO2)) — igneous

Obsidian

Volcanic glass (high silica content, usually >70% SiO2)

Pumice (Pumice (a highly vesicular volcanic glass)) — igneous

Pumice

Pumice (a highly vesicular volcanic glass)

Opalite (Man-made Glass (SiO2 + additives)) — mineraloid (synthetic)

Opalite

Man-made Glass (SiO2 + additives)

mineraloid (synthetic)

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

Apache Tear

Obsidian (Hydrated Volcanic Glass - SiO2)

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

Snowflake Obsidian

Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)

Pink Opal (Hydrated Silica (SiO2·nH2O) with Palygorskite inclusions) — Mineraloid

Pink Opal

Hydrated Silica (SiO2·nH2O) with Palygorskite inclusions

Obsidian (Obsidian (principally SiO2 - Silicon Dioxide)) — igneous

Obsidian

Obsidian (principally SiO2 - Silicon Dioxide)

Iron Slag (Vitreous glassy waste (Fe-Si-Al-Ca compounds)) — Mineral byproduct (anthropogenic / techno-fossil)

Iron Slag

Vitreous glassy waste (Fe-Si-Al-Ca compounds)

Mineral byproduct (anthropogenic / techno-fossil)

Conglomerate (Conglomerate (Clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (Clastic sedimentary rock)

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

Obsidian

Obsidian (Volcanic Glass, SiO2 dominated)

Tumbled amber (Amber (fossilized plant resin), chiefly polymerized diterpenoid resin) — gemstone

Tumbled amber

Amber (fossilized plant resin), chiefly polymerized diterpenoid resin

Pumice (Pumice (Vesicular Felsic Igneous Rock)) — igneous

Pumice

Pumice (Vesicular Felsic Igneous Rock)

Limonite (FeO(OH)•nH2O) — mineral

Limonite

FeO(OH)•nH2O

Quartz with Iron Oxide Inclusions (Silicon dioxide with limonite/hematite (SiO2)) — mineral

Quartz with Iron Oxide Inclusions

Silicon dioxide with limonite/hematite (SiO2)

Pumice (Pumice (Felsic vesicular volcanic glass)) — igneous

Pumice

Pumice (Felsic vesicular volcanic glass)

Amber (Fossilized Tree Resin (C10H16O)) — gemstone

Amber

Fossilized Tree Resin (C10H16O)

Chrysocolla (with Quartz and Malachite) (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O) — mineral

Chrysocolla (with Quartz and Malachite)

Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O

Anthracite Coal (Anthracite (Metamorphic/High-grade Sedimentary Coal)) — sedimentary

Anthracite Coal

Anthracite (Metamorphic/High-grade Sedimentary Coal)

Green Opal (Prase Opal) (SiO2 · nH2O (Hydrated Silicon Dioxide)) — mineral

Green Opal (Prase Opal)

SiO2 · nH2O (Hydrated Silicon Dioxide)

Limonite Nodule (FeO(OH)·nH2O (Hydrated iron oxide-hydroxide)) — mineral

Limonite Nodule

FeO(OH)·nH2O (Hydrated iron oxide-hydroxide)

Pumice (Pumice (Vesicular Felsic Igneous Rock)) — igneous

Pumice

Pumice (Vesicular Felsic Igneous Rock)

Pumice (Pumice (Glassy Volcanic Rock)) — igneous

Pumice

Pumice (Glassy Volcanic Rock)

Jasper Pebble (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper Pebble

Microcrystalline Quartz (SiO2)

Coal (Biogenic sedimentary rock (Carbon)) — sedimentary

Coal

Biogenic sedimentary rock (Carbon)

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Fossilized Shark Tooth (Chondrichthyes (class) fossilized tooth) — fossil

Fossilized Shark Tooth

Chondrichthyes (class) fossilized tooth

Chrysocolla ((Cu,Al)2H2Si2O5(OH)4·nH2O) — mineral

Chrysocolla

(Cu,Al)2H2Si2O5(OH)4·nH2O

Obsidian (Volcanic Glass (Silica / SiO2)) — igneous

Obsidian

Volcanic Glass (Silica / SiO2)

Ironstone Concretion (Ferruginous Concretion) — sedimentary

Ironstone Concretion

Ferruginous Concretion

Slag (Industrial Glassy Byproduct) (Ferro-silicate Slag) — Anthropogenic / Non-Natural

Slag (Industrial Glassy Byproduct)

Ferro-silicate Slag

Anthropogenic / Non-Natural

Chrysocolla Chalcedony (Hydrated Copper Phyllosilicate (Cu,Al)2H2Si2O5(OH)4 + SiO2) — mineral

Chrysocolla Chalcedony

Hydrated Copper Phyllosilicate (Cu,Al)2H2Si2O5(OH)4 + SiO2

Obsidian (Obsidian (Volcanic Glass; SiO2 content > 70%)) — igneous

Obsidian

Obsidian (Volcanic Glass; SiO2 content > 70%)

Snowflake Obsidian (Volcanic glass with Cristobalite inclusions (70–75% SiO2)) — igneous

Snowflake Obsidian

Volcanic glass with Cristobalite inclusions (70–75% SiO2)

Obsidian (Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)) — igneous

Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)

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

Rough Precious Opal

Hydrated Silica (SiO2·nH2O)

Ironstone Concretion (Siderite or Hematite-bonded Concretion) — sedimentary

Ironstone Concretion

Siderite or Hematite-bonded Concretion

Tufa (Calcareous Tufa) (Calcareous Tufa (CaCO3)) — sedimentary

Tufa (Calcareous Tufa)

Calcareous Tufa (CaCO3)

Blue Opal in Matrix (Hydrated Silica (SiO2·nH2O)) — mineral

Blue Opal in Matrix

Hydrated Silica (SiO2·nH2O)

Desert Varnish (on Sandstone) (Rock Varnish (composed of Manganese oxides, Iron oxides, and Clay minerals)) — sedimentary

Desert Varnish (on Sandstone)

Rock Varnish (composed of Manganese oxides, Iron oxides, and Clay minerals)