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

Nephrite Jade (Tremolite-Actinolite solid solution Ca2(Mg,Fe)5Si8O22(OH)2) — metamorphic

Nephrite Jade

Tremolite-Actinolite solid solution Ca2(Mg,Fe)5Si8O22(OH)2

Nephrite Jade (Tremolite-Actinolite solid solution Ca2(Mg,Fe)5Si8O22(OH)2) — metamorphic

Nephrite Jade

Tremolite-Actinolite solid solution Ca2(Mg,Fe)5Si8O22(OH)2

Iron-stained quartzite or quartz-rich breccia (Quartz (SiO₂), likely with iron oxides/hydroxides such as hematite and limonite) — metamorphic

Iron-stained quartzite or quartz-rich breccia

Quartz (SiO₂), likely with iron oxides/hydroxides such as hematite and limonite

Likely smoky quartz cabochon ring (Quartz, silicon dioxide (SiO₂), brown variety colored by irradiation and trace aluminum) — gemstone

Likely smoky quartz cabochon ring

Quartz, silicon dioxide (SiO₂), brown variety colored by irradiation and trace aluminum

Lapis Lazuli (Lazurite-dominated contact metamorphic rock) — metamorphic

Lapis Lazuli

Lazurite-dominated contact metamorphic rock

Perlite (Unexpanded) (Amorphous volcanic glass) — igneous

Perlite (Unexpanded)

Amorphous volcanic glass

Black Obsidian (Obsidian, SiO2 (amorphous)) — Igneous rock (Volcanic glass)

Black Obsidian

Obsidian, SiO2 (amorphous)

Igneous rock (Volcanic glass)

Mookaite Jasper (Siliceous (chert) sedimentary rock, a form of Jasper) — Sedimentary

Mookaite Jasper

Siliceous (chert) sedimentary rock, a form of Jasper

Sandstone (Quartz Sandstone (predominantly)) — Sedimentary

Sandstone

Quartz Sandstone (predominantly)

Olivine (peridot) grain (Olivine-group silicate, typically forsterite–fayalite solid solution: (Mg,Fe)₂SiO₄) — mineral

Olivine (peridot) grain

Olivine-group silicate, typically forsterite–fayalite solid solution: (Mg,Fe)₂SiO₄

Faceted red gemstone, likely garnet (Garnet group; probably almandine-pyrope solid solution, (Fe,Mg)₃Al₂(SiO₄)₃) — gemstone

Faceted red gemstone, likely garnet

Garnet group; probably almandine-pyrope solid solution, (Fe,Mg)₃Al₂(SiO₄)₃

Nephrite Jade / Greenstone (Tremolite-Actinolite solid solution series [Ca2(Mg,Fe)5Si8O22(OH)2]) — metamorphic

Nephrite Jade / Greenstone

Tremolite-Actinolite solid solution series [Ca2(Mg,Fe)5Si8O22(OH)2]

Red garnet cabochon ring (Garnet-group silicate, likely almandine–pyrope solid solution (X₃Y₂(SiO₄)₃)) — gemstone

Red garnet cabochon ring

Garnet-group silicate, likely almandine–pyrope solid solution (X₃Y₂(SiO₄)₃)

Nephrite Jade (Tremolite-Actinolite solid solution series (Ca2(Mg,Fe)5Si8O22(OH)2)) — metamorphic

Nephrite Jade

Tremolite-Actinolite solid solution series (Ca2(Mg,Fe)5Si8O22(OH)2)

Blue Obsidian (Obsidian) — igneous

Blue Obsidian

Obsidian

Cullet Glass / Slag Glass (Amorphous silica glass) — man-made glass / industrial byproduct

Cullet Glass / Slag Glass

Amorphous silica glass

man-made glass / industrial byproduct

Sea Glass (Silica (SiO2) - Amorphous) — Mineral

Sea Glass

Silica (SiO2) - Amorphous

Shungite (Shungite (Amorphous Carbon)) — mineral

Shungite

Shungite (Amorphous Carbon)

Moldavite (Tektite) — meteorite

Moldavite

Tektite

Nephrite Jade (Tremolite-Actinolite solid solution series, Ca2(Mg,Fe)5Si8O22(OH)2) — metamorphic

Nephrite Jade

Tremolite-Actinolite solid solution series, Ca2(Mg,Fe)5Si8O22(OH)2

Nephrite Jade (Tremolite-Actinolite solid solution series, Ca2(Mg,Fe)5Si8O22(OH)2) — metamorphic

Nephrite Jade

Tremolite-Actinolite solid solution series, Ca2(Mg,Fe)5Si8O22(OH)2

Nephrite Jade (Tremolite-Actinolite solid solution series [Ca2(Mg,Fe)5Si8O22(OH)2]) — metamorphic

Nephrite Jade

Tremolite-Actinolite solid solution series [Ca2(Mg,Fe)5Si8O22(OH)2]

Nephrite Jade (Tremolite-Actinolite solid solution series [Ca2(Mg,Fe)5Si8O22(OH)2]) — metamorphic

Nephrite Jade

Tremolite-Actinolite solid solution series [Ca2(Mg,Fe)5Si8O22(OH)2]

Gold and Silver (in jewelry form) (Gold (Au) and Silver (Ag)) — mineral

Gold and Silver (in jewelry form)

Gold (Au) and Silver (Ag)

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

Obsidian

Volcanic Glass (Amorphous Silica, SiO2)

Green Opal (Hydrated amorphous silica (SiO2·nH2O)) — mineraloid

Green Opal

Hydrated amorphous silica (SiO2·nH2O)

Fulgurite (Fulgurite (Lechatelierite)) — metamorphic

Fulgurite

Fulgurite (Lechatelierite)

Sea Glass (Frosted Glass Fragment) (Amorphous Silica (Anthropogenic Sediment)) — sedimentary

Sea Glass (Frosted Glass Fragment)

Amorphous Silica (Anthropogenic Sediment)

Blue glass-like heart pendant, likely synthetic blue spinel or colored glass (Unconfirmed; possibly synthetic spinel (MgAl₂O₄) or cobalt-colored glass) — gemstone

Blue glass-like heart pendant, likely synthetic blue spinel or colored glass

Unconfirmed; possibly synthetic spinel (MgAl₂O₄) or cobalt-colored glass

Apache Tear (Obsidian) (Obsidian) — Igneous

Apache Tear (Obsidian)

Obsidian

Blue-and-white opalite sphere (Opalite (commercial synthetic or glass-based imitation; not true opal), typically silica glass or synthetic opalescent material) — mineral

Blue-and-white opalite sphere

Opalite (commercial synthetic or glass-based imitation; not true opal), typically silica glass or synthetic opalescent material

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

Obsidian

Volcanic Glass (SiO2 with impurities)

Peridotite with olivine (Olivine-rich ultramafic rock; mainly forsterite–fayalite solid solution, (Mg,Fe)₂SiO₄) — igneous

Peridotite with olivine

Olivine-rich ultramafic rock; mainly forsterite–fayalite solid solution, (Mg,Fe)₂SiO₄

Peridot (likely, based on color and appearance) (Olivine group mineral, specifically (Mg,Fe)2SiO4 (Forsterite-Fayalite solid solution series)) — Mineral

Peridot (likely, based on color and appearance)

Olivine group mineral, specifically (Mg,Fe)2SiO4 (Forsterite-Fayalite solid solution series)

Fossil Shark Tooth (Carcharodon carcharias (modern/recent) or similar Lamniform fossil) — fossil

Fossil Shark Tooth

Carcharodon carcharias (modern/recent) or similar Lamniform fossil

Obsidian (Volcanic Glass (predominantly SiO2)) — igneous

Obsidian

Volcanic Glass (predominantly SiO2)

Green Opal (Hydrated amorphous silica (SiO2·nH2O)) — mineral

Green Opal

Hydrated amorphous silica (SiO2·nH2O)

Obsidian with Matrix (Volcanic Glass (SiO2)) — igneous

Obsidian with Matrix

Volcanic Glass (SiO2)

Petrified Wood (Petrified Wood (Silicified Wood)) — fossil

Petrified Wood

Petrified Wood (Silicified Wood)

Opal (Hydrated amorphous silica (SiO2·nH2O)) — mineral

Opal

Hydrated amorphous silica (SiO2·nH2O)

Black Obsidian (Obsidian (Volcanic Glass, SiO2 + impurity)) — igneous

Black Obsidian

Obsidian (Volcanic Glass, SiO2 + impurity)

Snowflake Obsidian (Obsidian with Cristobalite inclusions) — igneous

Snowflake Obsidian

Obsidian with Cristobalite inclusions