Rock Identifier

Category

Sedimentary (Volcanic)

Browse sedimentary (volcanic) specimens identified by the Rock Identifier community.

Basalt River Pebble (Basalt) — igneous

Basalt River Pebble

Basalt

Basalt (Basalt) — igneous

Basalt

Basalt

Diabase (also known as Dolerite) (Diabase) — igneous

Diabase (also known as Dolerite)

Diabase

Basalt (River Pebble) (Extrusive mafic igneous rock) — igneous

Basalt (River Pebble)

Extrusive mafic igneous rock

Purple Agate (Dyed Chalcedony) (SiO2 (Silicon Dioxide) with organic dyes) — mineral

Purple Agate (Dyed Chalcedony)

SiO2 (Silicon Dioxide) with organic dyes

Basalt-Amugydule (Amygdaloidal Basalt) (Aphanitic Mafic Igneous Rock with Vesicle Infillings) — igneous

Basalt-Amugydule (Amygdaloidal Basalt)

Aphanitic Mafic Igneous Rock with Vesicle Infillings

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

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Vesicular Basalt with Xenocrysts (Mafic Igneous Plutonic/Extrusive Complex) — igneous

Vesicular Basalt with Xenocrysts

Mafic Igneous Plutonic/Extrusive Complex

Peridot (Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4) — mineral

Peridot

Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4

River Pebble (Basalt) (Basalt (Aphanitic Mafic Igneous Rock)) — igneous

River Pebble (Basalt)

Basalt (Aphanitic Mafic Igneous Rock)

Basalt (Basalt) — igneous

Basalt

Basalt

Basalt (Basalt) — igneous

Basalt

Basalt

Amethyst (Tumbled) (Purple Quartz (SiO2 with iron impurities and irradiation)) — mineral

Amethyst (Tumbled)

Purple Quartz (SiO2 with iron impurities and irradiation)

Banded Agate (specifically Carnelian Agate) (Silicon dioxide (SiO2) - Chalcedony variety) — mineral

Banded Agate (specifically Carnelian Agate)

Silicon dioxide (SiO2) - Chalcedony variety

Slag (Industrial Glass) (Artificial Vitreous Silicate) — mineraloid (anthropogenic)

Slag (Industrial Glass)

Artificial Vitreous Silicate

mineraloid (anthropogenic)

Basalt (Basalt) — igneous

Basalt

Basalt

Chinese Writing Stone (Porphyritic Basalt or Porphyritic Andesite with Feldspar phenocrysts (SiO2-rich Silicates)) — igneous

Chinese Writing Stone

Porphyritic Basalt or Porphyritic Andesite with Feldspar phenocrysts (SiO2-rich Silicates)

Porphyritic Basalt (with Amygdales) (Amygdaloidal Porphyritic Basalt) — igneous

Porphyritic Basalt (with Amygdales)

Amygdaloidal Porphyritic Basalt

Vesicular Basalt (or Scoraceous Basalt) (Basalt with vesicular texture) — igneous

Vesicular Basalt (or Scoraceous Basalt)

Basalt with vesicular texture

Basalt (Basalt (Aphanitic-fine grained mafic igneous rock)) — igneous

Basalt

Basalt (Aphanitic-fine grained mafic igneous rock)

Basalt (Vesicular) (Extrusive mafic igneous rock; primarily (Ca, Na)(Mg, Fe, Al)(Si, Al)2O6 with (Ca, Na)(Al, Si)4O8) — igneous

Basalt (Vesicular)

Extrusive mafic igneous rock; primarily (Ca, Na)(Mg, Fe, Al)(Si, Al)2O6 with (Ca, Na)(Al, Si)4O8

Obsidian (Volcanic Glass (Amorphous Silicon Dioxide , SiO2)) — igneous

Obsidian

Volcanic Glass (Amorphous Silicon Dioxide , SiO2)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Satin Spar (Selenite) (Gypsum (CaSO4·2H2O)) — mineral

Satin Spar (Selenite)

Gypsum (CaSO4·2H2O)

Puddingstone (Gowganda Tillite/Lorrain Quartzite) (Jasper Conglomerate) — sedimentary

Puddingstone (Gowganda Tillite/Lorrain Quartzite)

Jasper Conglomerate

Greenstone (Protolith of basalt, diabase, or gabbro; often contains minerals like chlorite, actinolite, and epidote) — metamorphic

Greenstone

Protolith of basalt, diabase, or gabbro; often contains minerals like chlorite, actinolite, and epidote

Graveler (Fictional Interpretation) (Mons calcarius anthropomorphus) — igneous

Graveler (Fictional Interpretation)

Mons calcarius anthropomorphus

Diorite (Phaneritic Intermediate Plutonic Rock (Diorite)) — igneous

Diorite

Phaneritic Intermediate Plutonic Rock (Diorite)

Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

Peridot (Olivine (Mg, Fe)₂SiO₄) — mineral

Peridot

Olivine (Mg, Fe)₂SiO₄

Amethyst (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Diamond in Kimberlite (Diamond (C in Kimberlite)) — igneous

Diamond in Kimberlite

Diamond (C in Kimberlite)

Amethyst (Digital/Conceptual Representation) (Amethyst (Silicon Dioxide with iron impurities, SiO2)) — mineral

Amethyst (Digital/Conceptual Representation)

Amethyst (Silicon Dioxide with iron impurities, SiO2)

Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

Banded Agate (Microcrystalline Quartz (SiO2) with impurities) — mineral

Banded Agate

Microcrystalline Quartz (SiO2) with impurities

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

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Iron Slag (Anthropogenic Vitreous Ferrous Silicate) — industrial byproduct (anthropogenic)

Iron Slag

Anthropogenic Vitreous Ferrous Silicate

industrial byproduct (anthropogenic)

Scoria (Vesicular Basaltic Glass) — igneous

Scoria

Vesicular Basaltic Glass

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

Smoky Quartz (Apache Tear Variety)

Silicon dioxide (SiO2) - Volcanic Glass

Snowflake Obsidian (Hydrated Volcanic Glass (primarily SiO2) with Cristobalite inclusions) — igneous

Snowflake Obsidian

Hydrated Volcanic Glass (primarily SiO2) with Cristobalite inclusions

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

Obsidian (Black Obsidian)

Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)

Black Obsidian (Volcanic Glass (Amorphous Silicon Dioxide, SiO2)) — igneous

Black Obsidian

Volcanic Glass (Amorphous Silicon Dioxide, SiO2)