Rock Identifier

Category

Igneous (Anthropogenic)

Browse igneous (anthropogenic) specimens identified by the Rock Identifier community.

Granite (Granite) — Igneous

Granite

Granite

Porphyritic Andesite (Andesite) — igneous

Porphyritic Andesite

Andesite

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

Diorite (Phaneritic intermediate plutonic rock) — igneous

Diorite

Phaneritic intermediate plutonic rock

Basalt (Basalt (Aphanitic Mafic Rock)) — igneous

Basalt

Basalt (Aphanitic Mafic Rock)

Vesicular Basalt / Scoria (Vesicular Basalt) — igneous

Vesicular Basalt / Scoria

Vesicular Basalt

Pumice or Tuff (Pumice / Tuff) — igneous

Pumice or Tuff

Pumice / Tuff

Snowflake Obsidian (Tumbled) (Obsidian with Cristobalite inclusions) — igneous

Snowflake Obsidian (Tumbled)

Obsidian with Cristobalite inclusions

Granite (Granite) — Igneous

Granite

Granite

Granite (Granite) — Igneous

Granite

Granite

Basalt River Cobble (Basalt) — igneous

Basalt River Cobble

Basalt

Graphic Granite (Pegmatitic Feldspar and Quartz (Graphic Granite)) — igneous

Graphic Granite

Pegmatitic Feldspar and Quartz (Graphic Granite)

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

Granite (Phaneritic Plutonic Felsic Rock (SiO2 > 69%)) — igneous

Granite

Phaneritic Plutonic Felsic Rock (SiO2 > 69%)

Obsidian (Obsidian (Volcanic glass), SiO2 (70% or more)) — igneous

Obsidian

Obsidian (Volcanic glass), SiO2 (70% or more)

Granodiorite (Granodiorite (NaCa0.5(AlSi3O8)2(Fe,Mg)2)) — igneous

Granodiorite

Granodiorite (NaCa0.5(AlSi3O8)2(Fe,Mg)2)

Basalt with Epidote (Mafic volcanic rock with Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))) — igneous

Basalt with Epidote

Mafic volcanic rock with Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Scoria (Scoria (Extrusive Volcanic Rock)) — igneous

Scoria

Scoria (Extrusive Volcanic Rock)

Scoria (Scoriaceous Basalt) — igneous

Scoria

Scoriaceous Basalt

Granite Pebble (Granite (composed primarily of Quartz: SiO2, Feldspar: KAlSi3O8, and Mica: K(Mg,Fe)3AlSi3O10(OH)2)) — igneous

Granite Pebble

Granite (composed primarily of Quartz: SiO2, Feldspar: KAlSi3O8, and Mica: K(Mg,Fe)3AlSi3O10(OH)2)

Banded Rhyolite (or Gray Shale pebble) (Rhyolite (SiO2 with minor impurities)) — igneous

Banded Rhyolite (or Gray Shale pebble)

Rhyolite (SiO2 with minor impurities)

Pumice (Pumice (Amorphous volcanic glass)) — igneous

Pumice

Pumice (Amorphous volcanic glass)

Pumice (Pumice (Amorphous volcanic glass)) — igneous

Pumice

Pumice (Amorphous volcanic glass)

Basalt (River Stone) (Basalt (SiO2 range 45-52%)) — igneous

Basalt (River Stone)

Basalt (SiO2 range 45-52%)

Granite (Granite (phaneritic felsic intrusive rock)) — igneous

Granite

Granite (phaneritic felsic intrusive rock)

Obsidian (Volcanic glass (SiO2)) — igneous

Obsidian

Volcanic glass (SiO2)

Granite (Phaneritic plutonic rock (SiO2 > 69%)) — igneous

Granite

Phaneritic plutonic rock (SiO2 > 69%)

Granite (Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)) — igneous

Granite

Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)

Basalt River Pebble (Basalt) — igneous

Basalt River Pebble

Basalt

Granite (Granite (Alkali-feldspar granite)) — igneous

Granite

Granite (Alkali-feldspar granite)

Silver Sheen Obsidian (Volcanic Glass (SiO2)) — igneous

Silver Sheen Obsidian

Volcanic Glass (SiO2)

Basalt Pebble (Basalt) — igneous

Basalt Pebble

Basalt

Porphyritic Andesite (Andesite (with white Plagioclase phenocrysts)) — igneous

Porphyritic Andesite

Andesite (with white Plagioclase phenocrysts)

Basalt (Basalt) — igneous

Basalt

Basalt

Basalt (River Stone) (Basalt) — igneous

Basalt (River Stone)

Basalt

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

Basalt (Porphyritic) (Porphyritic Basalt) — igneous

Basalt (Porphyritic)

Porphyritic Basalt

Granite (Plutonic Granite) — igneous

Granite

Plutonic Granite

Graphic Granite (Graphic Granite (variety of Pegmatite)) — igneous

Graphic Granite

Graphic Granite (variety of Pegmatite)

Granite Cobble (Granite) — igneous

Granite Cobble

Granite

Drill Core (Basalt or Andesite) (Volcanic porphyry (mafic to intermediate)) — igneous

Drill Core (Basalt or Andesite)

Volcanic porphyry (mafic to intermediate)

Granite (Granite (Phaneritic Quartz-Feldspar rock)) — igneous

Granite

Granite (Phaneritic Quartz-Feldspar rock)