Rock Identifier

Category

Amorphous Solid

Browse amorphous solid specimens identified by the Rock Identifier community.

Obsidian (Obsidian (Volcanic Glass)) — igneous

Obsidian

Obsidian (Volcanic Glass)

igneous
Obsidian (Volcanic Glass (predominantly SiO2)) — igneous

Obsidian

Volcanic Glass (predominantly SiO2)

igneous
Amber (Resinite / Fossilized Tree Resin) — mineral

Amber

Resinite / Fossilized Tree Resin

mineral
Limonite (Iron Ore) (FeO(OH)·nH2O (Hydrous ferric oxide)) — mineral

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)

mineral
Opalite (Synthetic Moonstone/Opal) (Synthetic Silica Glass) — mineraloid (synthetic)

Opalite (Synthetic Moonstone/Opal)

Synthetic Silica Glass

mineraloid (synthetic)
Fulgurite (Fulgurite (Lechatelierite-rich variety)) — metamorphic

Fulgurite

Fulgurite (Lechatelierite-rich variety)

metamorphic
Limonite/Goethite Nodule (Iron Oxyhydroxide (primarily FeO(OH)·nH2O)) — mineral

Limonite/Goethite Nodule

Iron Oxyhydroxide (primarily FeO(OH)·nH2O)

mineral
Coquina (Bioclastic Limestone) — sedimentary

Coquina

Bioclastic Limestone

sedimentary
Common Opal in Host Rock (Hydrated Silica (SiO2·nH2O)) — mineraloid

Common Opal in Host Rock

Hydrated Silica (SiO2·nH2O)

mineraloid
Amber (Succinite (fossilized resin)) — mineral

Amber

Succinite (fossilized resin)

mineral
Amber (with potentially inclusions) (Succinite (Fossilized Tree Resin)) — Mineraloid

Amber (with potentially inclusions)

Succinite (Fossilized Tree Resin)

Mineraloid
Amber (Succinite (specifically for Baltic amber); Fossilized Tree Resin (C10H16O)) — Organic Mineraloid

Amber

Succinite (specifically for Baltic amber); Fossilized Tree Resin (C10H16O)

Organic Mineraloid
Amber (Succinite (Fossilized Tree Resin)) — mineraloid

Amber

Succinite (Fossilized Tree Resin)

mineraloid
Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

sedimentary
Obsidian (Volcanic glass (primary composition: SiO2)) — igneous

Obsidian

Volcanic glass (primary composition: SiO2)

igneous
Amber (Succinite (specifically for Baltic amber); approximate formula C10H16O) — Mineraloid

Amber

Succinite (specifically for Baltic amber); approximate formula C10H16O

Mineraloid
Amber (specifically Cherry Amber) (Succinite (with the chemical formula C10H16O)) — Organic Gemstone (not a mineral)

Amber (specifically Cherry Amber)

Succinite (with the chemical formula C10H16O)

Organic Gemstone (not a mineral)
Limonite (Limonite (Hydrous iron oxides, predominantly Goethite FeO(OH)·nH2O)) — mineral

Limonite

Limonite (Hydrous iron oxides, predominantly Goethite FeO(OH)·nH2O)

mineral
Anthracite Coal (Anthracite (Carbon-rich metamorphic sedimentary rock)) — sedimentary

Anthracite Coal

Anthracite (Carbon-rich metamorphic sedimentary rock)

sedimentary
Amber (Succinite (fossilized resin); C10H16O) — mineraloid

Amber

Succinite (fossilized resin); C10H16O

mineraloid
Coquina (Bioclastic Limestone (CaCO3)) — sedimentary

Coquina

Bioclastic Limestone (CaCO3)

sedimentary
Obsidian (Obsidian (Volcanic Glass)) — igneous

Obsidian

Obsidian (Volcanic Glass)

igneous
Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

sedimentary
Amber (Succinicum (Organic compound, primarily C10H16O)) — Organic Gemstone (Mineraloid)

Amber

Succinicum (Organic compound, primarily C10H16O)

Organic Gemstone (Mineraloid)
Anthracite Coal (Anthracite (Carbon C)) — metamorphic

Anthracite Coal

Anthracite (Carbon C)

metamorphic
Obsidian (Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)) — igneous

Obsidian

Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)

igneous
Anthracite Coal (Anthracite (Carbon)) — sedimentary

Anthracite Coal

Anthracite (Carbon)

sedimentary
Limonite (Limonite (FeOO·nH2O)) — mineral

Limonite

Limonite (FeOO·nH2O)

mineral
Obsidian (Black) (Obsidian (approx. 70–75% SiO2)) — igneous

Obsidian (Black)

Obsidian (approx. 70–75% SiO2)

igneous
Anthracite Coal (Anthracite) — metamorphic

Anthracite Coal

Anthracite

metamorphic
Coal (likely Anthracite) (Anthracite coal) — sedimentary

Coal (likely Anthracite)

Anthracite coal

sedimentary
Copper Ore with Malachite and Chrysocolla (Cu2CO3(OH)2 (Malachite) with Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla)) — mineral

Copper Ore with Malachite and Chrysocolla

Cu2CO3(OH)2 (Malachite) with Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla)

mineral
Limonite (Iron Stone/Goethite) (Limonite (mixture of hydrated iron oxides, primarily Goethite: α-FeO(OH))) — mineral

Limonite (Iron Stone/Goethite)

Limonite (mixture of hydrated iron oxides, primarily Goethite: α-FeO(OH))

mineral
Obsidian (Volcanic glass (SiO2 - Silicon Dioxide with impurities)) — Igneous

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide with impurities)

Igneous
Yellow Ochre / Limonite (Limonite (FeO(OH)·nH2O)) — Mineral

Yellow Ochre / Limonite

Limonite (FeO(OH)·nH2O)

Mineral
Limonite (Iron Ore) (Limonite (FeO(OH)·nH2O)) — mineral

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

mineral
Limonite (Yellow Ochre) (Hydrated iron(III) oxide-hydroxides (FeO(OH)·nH2O)) — mineral

Limonite (Yellow Ochre)

Hydrated iron(III) oxide-hydroxides (FeO(OH)·nH2O)

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

Chrysocolla

Hydrated copper silicates (Cu, Al)2H2Si2O5(OH)4·nH2O

mineral
Black Obsidian (Volcanic Glass (SiO2 + impurities)) — igneous

Black Obsidian

Volcanic Glass (SiO2 + impurities)

igneous
Apache Tear (Obsidian) (Volcanic glass (SiO2 - Silicon Dioxide)) — igneous

Apache Tear (Obsidian)

Volcanic glass (SiO2 - Silicon Dioxide)

igneous
Fossilized Crab Carapace (Concretion) (Decapoda (fossil), typically preserved in calcite or siderite concretion) — sedimentary

Fossilized Crab Carapace (Concretion)

Decapoda (fossil), typically preserved in calcite or siderite concretion

sedimentary
Amber (Succinite (fossilized resin)) — mineral

Amber

Succinite (fossilized resin)

mineral