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

Quartzite Cobble (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Quartzite Cobble

Metamorphosed Quartz Sandstone (SiO2)

Pumice (Pumice (SiO2 + Al2O3 + Fe2O3)) — igneous

Pumice

Pumice (SiO2 + Al2O3 + Fe2O3)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Basalt with Peridotite Xenolith (Mafic Igneous Rock with Peridotite Inclusion (Olivine-rich)) — igneous

Basalt with Peridotite Xenolith

Mafic Igneous Rock with Peridotite Inclusion (Olivine-rich)

Gold (Native gold (Au)) — mineral

Gold

Native gold (Au)

Vesicular Basalt (Scoria) (Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene)) — igneous

Vesicular Basalt (Scoria)

Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Chondrite (Ordinary Chondrite (L or H group)) — meteorite

Chondrite

Ordinary Chondrite (L or H group)

Agate Geode Node (Cryptocrystalline Quartz (SiO2)) — mineral

Agate Geode Node

Cryptocrystalline Quartz (SiO2)

Green Jasper (Silicon Dioxide (SiO2) with iron silicate inclusions) — sedimentary

Green Jasper

Silicon Dioxide (SiO2) with iron silicate inclusions

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Thunderegg (specifically a Jasper/Agate-filled Geode nodule) (Silicon Dioxide (SiO2) within Rhyolitic Matrix) — igneous

Thunderegg (specifically a Jasper/Agate-filled Geode nodule)

Silicon Dioxide (SiO2) within Rhyolitic Matrix

Coquina (Bioclastic Limestone (composed primarily of CaCO3)) — sedimentary

Coquina

Bioclastic Limestone (composed primarily of CaCO3)

Quartzite Pebble (Quartzite) — metamorphic

Quartzite Pebble

Quartzite

Quartzite Cobble (Quartzite (SiO2)) — metamorphic

Quartzite Cobble

Quartzite (SiO2)

Chalcedony (Yellow Jasper or Agate) (Microcrystalline Quartz (SiO2)) — mineral

Chalcedony (Yellow Jasper or Agate)

Microcrystalline Quartz (SiO2)

Petrified Wood (Silicified Wood (primarily Quartz/Chalcedony replacing $SiO_2$)) — sedimentary

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony replacing $SiO_2$)

Quartzite (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite

Metamorphic Quartzite (SiO2)

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Geode (Quartz / Chalcedony Geode) (SiO2 (Silicon Dioxide)) — sedimentary

Geode (Quartz / Chalcedony Geode)

SiO2 (Silicon Dioxide)

Turquoise (Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O) — mineral

Turquoise

Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O

Green Quartzite (Silicon Dioxide (SiO2) with mineral inclusions) — metamorphic

Green Quartzite

Silicon Dioxide (SiO2) with mineral inclusions

Quartzite Pebble (Quartzite) — metamorphic

Quartzite Pebble

Quartzite

Vesicular Basalt (Scoria) (Aphanitic Mafic Igneous Rock (Vesicular Basalt)) — igneous

Vesicular Basalt (Scoria)

Aphanitic Mafic Igneous Rock (Vesicular Basalt)

Ferruginous Quartzite (Iron-stained Quartz) (Quartzite (SiO2 with Fe-oxide staining)) — metamorphic

Ferruginous Quartzite (Iron-stained Quartz)

Quartzite (SiO2 with Fe-oxide staining)

Graphic Granite (Graphic Granite (Granite Pegmatite)) — igneous

Graphic Granite

Graphic Granite (Granite Pegmatite)

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

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Geode (unopened) or Calcareous Nodule (Siliceous or Calcareous Concretion/Nodule) — sedimentary

Geode (unopened) or Calcareous Nodule

Siliceous or Calcareous Concretion/Nodule

Geode with Quartz Crystal Cavity (Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix) — sedimentary

Geode with Quartz Crystal Cavity

Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix

Quartzite Breccia (Brecciated Quartzite (SiO2)) — metamorphic

Quartzite Breccia

Brecciated Quartzite (SiO2)

Yellow Jasper (Silicon dioxide (SiO2)) — sedimentary

Yellow Jasper

Silicon dioxide (SiO2)

Amethyst Geode (Silicon Dioxide with trace inclusions of Iron (SiO2)) — mineral

Amethyst Geode

Silicon Dioxide with trace inclusions of Iron (SiO2)

Weathered iron-rich sandstone or laterite fragment (Ferruginous sandstone, chiefly quartz (SiO₂) cemented or stained by iron oxides/hydroxides) — sedimentary

Weathered iron-rich sandstone or laterite fragment

Ferruginous sandstone, chiefly quartz (SiO₂) cemented or stained by iron oxides/hydroxides

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

Quartz Geode

Crystalline Silicon Dioxide (SiO2)

Conglomerate (Conglomerate (Clastic Sedimentary Rock)) — sedimentary

Conglomerate

Conglomerate (Clastic Sedimentary Rock)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

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

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Vesicular Basalt (Basalt (Vesicular)) — igneous

Vesicular Basalt

Basalt (Vesicular)

Unopened Geode (Geode (containing various mineralization like Quartz SiO2)) — sedimentary

Unopened Geode

Geode (containing various mineralization like Quartz SiO2)

Agate (Thunderegg segment) (Silicon dioxide (SiO2) - Microcrystalline Quartz/Chalcedony) — mineral

Agate (Thunderegg segment)

Silicon dioxide (SiO2) - Microcrystalline Quartz/Chalcedony