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

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

Apache Tear (Obsidian)

Volcanic glass (SiO2 - Silicon Dioxide)

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

Pink Opal

Amorphous Hydrous Silica (SiO2·nH2O)

Slag Glass (Vitreous Silicate Residue) — industrial byproduct (anthropogenic rock)

Slag Glass

Vitreous Silicate Residue

industrial byproduct (anthropogenic rock)

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

Opal

Hydrated Silica (SiO2·nH2O)

Amber (Fossilized Tree Resin) — gemstone

Amber

Fossilized Tree Resin

White Opal (Hydrated Amorphous Silica (SiO2·nH2O)) — Mineraloid

White Opal

Hydrated Amorphous Silica (SiO2·nH2O)

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

Precious Opal

Hydrated Silica (SiO2·nH2O)

Smoky Quartz (Apache Tear Variety) (Silicon dioxide (SiO2) - Volcanic Glass) — igneous

Smoky Quartz (Apache Tear Variety)

Silicon dioxide (SiO2) - Volcanic Glass

Rainbow Obsidian (Volcanic glass (SiO2 - approximately 70% or more silicon dioxide)) — Igneous

Rainbow Obsidian

Volcanic glass (SiO2 - approximately 70% or more silicon dioxide)

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

Black Opal (Triplet)

Hydrated Silica (SiO2·nH2O)

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

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

Opal

Hydrated amorphous silica (SiO2·nH2O)

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

Opal

Hydrated Silica (SiO2·nH2O)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Obsidian (Volcanic glass (high silica content based on SiO2)) — igneous

Obsidian

Volcanic glass (high silica content based on SiO2)

Amber (Succinite (Approximate formula: C10H16O)) — Mineraloid

Amber

Succinite (Approximate formula: C10H16O)

Opal (Hydrated silicon dioxide (SiO2·nH2O)) — gemstone

Opal

Hydrated silicon dioxide (SiO2·nH2O)

Geode Nodules / Chalcedony Geode (Silicon Dioxide (SiO2) - Amorphous to Cryptocrystalline Quartz) — sedimentary

Geode Nodules / Chalcedony Geode

Silicon Dioxide (SiO2) - Amorphous to Cryptocrystalline Quartz

Opal cabochon or opal-like decorative specimen (Hydrated amorphous silica, SiO₂·nH₂O; likely synthetic or assembled opal material) — gemstone

Opal cabochon or opal-like decorative specimen

Hydrated amorphous silica, SiO₂·nH₂O; likely synthetic or assembled opal material

Opal (in Jewelry Setting) (Hydrated Silicon Dioxide (SiO2·nH2O)) — gemstone

Opal (in Jewelry Setting)

Hydrated Silicon Dioxide (SiO2·nH2O)

Slag (Industrial Byproduct) (Anthropogenic Vitreous Silicate material) — igneous

Slag (Industrial Byproduct)

Anthropogenic Vitreous Silicate material

Green Opal (Hydrated Silica (SiO2·nH2O)) — mineraloid

Green Opal

Hydrated Silica (SiO2·nH2O)

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

Opal

Hydrated amorphous silica (SiO2·nH2O)

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

Opal

Hydrated amorphous silica (SiO2·nH2O)

Shell Cameo (Cypraecassis rufa (Bullmouth Queen Helmet Shell)) — mineraloid / biogenic specimen

Shell Cameo

Cypraecassis rufa (Bullmouth Queen Helmet Shell)

mineraloid / biogenic specimen

Petrified Wood (Fossilized Wood (silicified wood)) — fossil

Petrified Wood

Fossilized Wood (silicified wood)

Petrified Wood (Silicified wood (primarily quartz, SiO2)) — fossil

Petrified Wood

Silicified wood (primarily quartz, SiO2)

Red Jasper or Iron-rich Sandstone (SiO2 with Fe2O3 inclusions (if Jasper) or Arenite (if Sandstone)) — sedimentary

Red Jasper or Iron-rich Sandstone

SiO2 with Fe2O3 inclusions (if Jasper) or Arenite (if Sandstone)

Porphyritic Andesite or Basalt (Porphyritic Intermediate/Mafic Igneous Rock) — igneous

Porphyritic Andesite or Basalt

Porphyritic Intermediate/Mafic Igneous Rock

Quartz Geode (Silicon dioxide (SiO2)) — mineral

Quartz Geode

Silicon dioxide (SiO2)

Quartz Geode (Silicon Dioxide (SiO2) in sedimentary host rock) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2) in sedimentary host rock

Geode or Concretion (Silica-filled nodule (likely SiO2)) — sedimentary

Geode or Concretion

Silica-filled nodule (likely SiO2)

Tumbled Black Stone (Unknown (possibly basalt, obsidian, or black jasper)) — igneous or sedimentary

Tumbled Black Stone

Unknown (possibly basalt, obsidian, or black jasper)

igneous or sedimentary

Quartz Geode (Crystalline Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Crystalline Silicon Dioxide (SiO2)

Vesicular Basalt (Lava Rock) (Vesicular Basalt) — igneous

Vesicular Basalt (Lava Rock)

Vesicular Basalt

Quartz Geode (Silicon Dioxide (SiO2) in Geode form) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2) in Geode form

Vesicular Basalt (Lava Rock) (Vesicular Basalt) — igneous

Vesicular Basalt (Lava Rock)

Vesicular Basalt

Asphalt (Asphalt concrete) — sedimentary

Asphalt

Asphalt concrete

Red garnet gemstone (Garnet group; likely almandine–pyrope, (Fe,Mg)₃Al₂(SiO₄)₃) — gemstone

Red garnet gemstone

Garnet group; likely almandine–pyrope, (Fe,Mg)₃Al₂(SiO₄)₃

Druzy Quartz on Quartz Base (Silicon Dioxide (SiO2)) — mineral

Druzy Quartz on Quartz Base

Silicon Dioxide (SiO2)

River Pebble (Quartzite / Weathered Sedimentary Rock) — sedimentary

River Pebble

Quartzite / Weathered Sedimentary Rock

Quartz-filled Basalt Geode (Amygdaloidal Basalt with Quartz (SiO2)) — igneous

Quartz-filled Basalt Geode

Amygdaloidal Basalt with Quartz (SiO2)