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

Geode (unopened) (Chert / Chalcedony Geode (SiO2)) — sedimentary

Geode (unopened)

Chert / Chalcedony Geode (SiO2)

Scoria (Lava Rock) (Mafic Volcanic Scoria) — igneous

Scoria (Lava Rock)

Mafic Volcanic Scoria

Amygdaloidal Basalt (Amygdaloidal Basalt (Mafic silicate with secondary mineral inclusions)) — Igneous

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic silicate with secondary mineral inclusions)

Basalt (Weathered/Tumbled) (Extrusive Mafic Igneous Rock) — igneous

Basalt (Weathered/Tumbled)

Extrusive Mafic Igneous Rock

Black Onyx (Black Chalcedony (SiO2)) — mineral

Black Onyx

Black Chalcedony (SiO2)

Agatized Petrified Wood (Silicon Dioxide (SiO2) - Chalcedony pseudomorph after Wood) — metamorphic

Agatized Petrified Wood

Silicon Dioxide (SiO2) - Chalcedony pseudomorph after Wood

Black Onyx (Chalcedony (Silicon Dioxide - SiO2)) — mineral

Black Onyx

Chalcedony (Silicon Dioxide - SiO2)

Natural Freshwater Pearl (Calcium Carbonate (Aragonite and Calcite), CaCO3) — gemstone

Natural Freshwater Pearl

Calcium Carbonate (Aragonite and Calcite), CaCO3

Yellow Agate (Chalcedony) (Silicon Dioxide (SiO2)) — sedimentary

Yellow Agate (Chalcedony)

Silicon Dioxide (SiO2)

Chalcedony (Agate and Carnelian varieties) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Agate and Carnelian varieties)

Silicon Dioxide (SiO2)

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

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Megalodon Shark Tooth (Otodus megalodon) — fossil

Megalodon Shark Tooth

Otodus megalodon

Bowling Ball (Brunswick T-Zone Deep Space) (Polyester resin / Polyurethane polymer) — Synthetic (not a natural rock)

Bowling Ball (Brunswick T-Zone Deep Space)

Polyester resin / Polyurethane polymer

Synthetic (not a natural rock)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Sandstone (Arenite (SiO2 based with various mineral cements)) — sedimentary

Sandstone

Arenite (SiO2 based with various mineral cements)

Red Quartzite (Quartzite (SiO2 with iron oxide impurities)) — metamorphic

Red Quartzite

Quartzite (SiO2 with iron oxide impurities)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Black Tourmaline in Quartz (Schorl (NaFe3Al6(BO3)3Si6O18(OH)4) in Quartz (SiO2)) — mineral

Black Tourmaline in Quartz

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4) in Quartz (SiO2)

Gold Nuggests (Native Gold (Au)) — mineral

Gold Nuggests

Native Gold (Au)

Agate (Slab) (Agate (Cryptocrystalline variety of Quartz, SiO2)) — Mineral

Agate (Slab)

Agate (Cryptocrystalline variety of Quartz, SiO2)

Botryoidal Chalcedony (Agate) (Cryptocrystalline Quartz (SiO2)) — mineral

Botryoidal Chalcedony (Agate)

Cryptocrystalline Quartz (SiO2)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

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

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Chondrite Meteorite (Ordinary Chondrite (Fe-Ni alloy, Olivine, Pyroxene)) — Mineral

Chondrite Meteorite

Ordinary Chondrite (Fe-Ni alloy, Olivine, Pyroxene)

Gray Agate (Cryptocrystalline Quartz (SiO2)) — mineral

Gray Agate

Cryptocrystalline Quartz (SiO2)

Scoria (Scoria (vesicular basaltic rock)) — igneous

Scoria

Scoria (vesicular basaltic rock)

Red Jasper (River Pebble) (Silicon Dioxide (SiO2) with hematite impurities) — sedimentary (microcrystalline quartz)

Red Jasper (River Pebble)

Silicon Dioxide (SiO2) with hematite impurities

sedimentary (microcrystalline quartz)

Red Jasper (Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Emerald in Matrix (Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities) — mineral

Emerald in Matrix

Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities

Druzy Quartz on Ironstone (Silicon Dioxide (SiO2) on Limonitic Ironstone) — mineral

Druzy Quartz on Ironstone

Silicon Dioxide (SiO2) on Limonitic Ironstone

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Bloodstone (Heliotrope (Chalcedony)) — mineral

Bloodstone

Heliotrope (Chalcedony)

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

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Petrified Wood (Silicified Wood (Quartzo-feldspathic fossil wood)) — fossil

Petrified Wood

Silicified Wood (Quartzo-feldspathic fossil wood)

Fossil Belemnite Guard (Belemnitella spp. (rostrum)) — fossil

Fossil Belemnite Guard

Belemnitella spp. (rostrum)

Blue Lace Agate (Cryptocrystalline variety of Quartz (SiO2)) — mineral

Blue Lace Agate

Cryptocrystalline variety of Quartz (SiO2)

Porphyry (Porphyritic Igneous Rock (likely Porphyritic Andesite or Basalt)) — igneous

Porphyry

Porphyritic Igneous Rock (likely Porphyritic Andesite or Basalt)

Sodalite Syenite (popularly known as Yooperlite) (Sodalite-rich Syenite (composed of alkali feldspar and sodalite)) — Igneous

Sodalite Syenite (popularly known as Yooperlite)

Sodalite-rich Syenite (composed of alkali feldspar and sodalite)

Petrified Wood (Jet or Coalified Wood appearance) (Silicified wood (principally SiO2) or Carbonized Wood) — sedimentary

Petrified Wood (Jet or Coalified Wood appearance)

Silicified wood (principally SiO2) or Carbonized Wood

Chalcedony Geode Fragment (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Chalcedony Geode Fragment

Silicon Dioxide (SiO2) - Microcrystalline Quartz