Rock Identifier

Category

Igneous Or Sedimentary (Anthropogenic Modification)

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

Basalt with Quartz Veins (Basalt (SiO2 range 45-52%)) — igneous

Basalt with Quartz Veins

Basalt (SiO2 range 45-52%)

Diorite (Phaneritic intermediate plutonic rock) — Igneous

Diorite

Phaneritic intermediate plutonic rock

Basalt (River Pebble) (Mafic volcanic rock (primarily Plagioclase feldspar and Pyroxene)) — igneous

Basalt (River Pebble)

Mafic volcanic rock (primarily Plagioclase feldspar and Pyroxene)

Scoria (often called Lava Rock) (Vesicular Basalt / Scoria) — igneous

Scoria (often called Lava Rock)

Vesicular Basalt / Scoria

Basalt (Vesicular and Ropey) (Vesicular Basalt / Pahoehoe Basalt) — igneous

Basalt (Vesicular and Ropey)

Vesicular Basalt / Pahoehoe Basalt

Pumice or Scoria (Vesicular volcanic rock) — Igneous

Pumice or Scoria

Vesicular volcanic rock

Basalt with Vesicles (Vesicular Basalt (comprising Plagioclase Feldspar, Pyroxene, and Olivine)) — igneous

Basalt with Vesicles

Vesicular Basalt (comprising Plagioclase Feldspar, Pyroxene, and Olivine)

Black Tourmaline in Quartz (Schorl (NaFe3Al6(BO3)3Si6O18(OH)4) in Silicon Dioxide (SiO2)) — igneous

Black Tourmaline in Quartz

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4) in Silicon Dioxide (SiO2)

Basalt (River Stone) (Mafic volcanic rock) — igneous

Basalt (River Stone)

Mafic volcanic rock

Basalt (Basalt (comprising Plagioclase feldspar, Pyroxene, and Olivine)) — igneous

Basalt

Basalt (comprising Plagioclase feldspar, Pyroxene, and Olivine)

Obsidian (Obsidian (Volcanic Glass, primarily SiO2)) — igneous

Obsidian

Obsidian (Volcanic Glass, primarily SiO2)

Basalt (River Stone) (Basalt) — igneous

Basalt (River Stone)

Basalt

Diabase (Greenstone Pebble) (Diabase or Dolerite) — igneous

Diabase (Greenstone Pebble)

Diabase or Dolerite

Granite (Granite (composed of Quartz, Feldspar, and Mica/Amphibole)) — igneous

Granite

Granite (composed of Quartz, Feldspar, and Mica/Amphibole)

Basalt (Mafic Volcanic Rock) — igneous

Basalt

Mafic Volcanic Rock

Obsidian (Obsidian (Volcanic Glass, SiO2)) — igneous

Obsidian

Obsidian (Volcanic Glass, SiO2)

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

River Rock (Basalt)

Basalt (SiO2 range: 45-52%)

Tektite (Indochinite) (Tektite (High-silica natural glass)) — igneous

Tektite (Indochinite)

Tektite (High-silica natural glass)

Porphyritic Rhyolite (Red Rhyolite) (Rhyolite (Porphyry)) — igneous

Porphyritic Rhyolite (Red Rhyolite)

Rhyolite (Porphyry)

Basalt (Basalt) — igneous

Basalt

Basalt

Pink Granite (Phaneritic plutonic rock (dominated by Alkali Feldspar)) — igneous

Pink Granite

Phaneritic plutonic rock (dominated by Alkali Feldspar)

Basalt (with possible quartz veinsing) (Basalt) — igneous

Basalt (with possible quartz veinsing)

Basalt

Graphic Granite (Zebra Rock) (Pegmatitic Granite (composed of Quartz and K-Feldspar)) — igneous

Graphic Granite (Zebra Rock)

Pegmatitic Granite (composed of Quartz and K-Feldspar)

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

Obsidian (Black Obsidian)

Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)

Diorite (Phaneritic intermediate plutonic rock) — igneous

Diorite

Phaneritic intermediate plutonic rock

Granite porphyry (Porphyritic Granite) — igneous

Granite porphyry

Porphyritic Granite

Obsidian (Volcanic glass (Mainly SiO2)) — igneous

Obsidian

Volcanic glass (Mainly SiO2)

Granite (Phaneritic plutonic rock (composed of quartz, alkali feldspar, and plagioclase)) — igneous

Granite

Phaneritic plutonic rock (composed of quartz, alkali feldspar, and plagioclase)

Basalt with Scoria/Vesicular Texture (Vesicular Basalt (Iron-rich/Oxidized)) — igneous

Basalt with Scoria/Vesicular Texture

Vesicular Basalt (Iron-rich/Oxidized)

BROWN GRANITE (likely 'Tan Brown' or similar) (Granite (specifically a variety rich in orthoclase feldspar, often with biotite and possibly hornblende)) — igneous

BROWN GRANITE (likely 'Tan Brown' or similar)

Granite (specifically a variety rich in orthoclase feldspar, often with biotite and possibly hornblende)

Yooperlite (Sodalite-bearing Syenite) (Sodalite-rich Syenite (Na8(Al6Si6O24)Cl2)) — igneous

Yooperlite (Sodalite-bearing Syenite)

Sodalite-rich Syenite (Na8(Al6Si6O24)Cl2)

Limonitic Scoria (Vesicular Basalt with Iron Staining) (Highly vesicular basalt heavily stained by Limonite [FeO(OH)·nH2O]) — igneous

Limonitic Scoria (Vesicular Basalt with Iron Staining)

Highly vesicular basalt heavily stained by Limonite [FeO(OH)·nH2O]

Scoria (Scoria (a vesicular basalt or andesite)) — igneous

Scoria

Scoria (a vesicular basalt or andesite)

Basalt (Basalt) — igneous

Basalt

Basalt

Pink Granite (Granite (Felsic Plutonic Rock)) — igneous

Pink Granite

Granite (Felsic Plutonic Rock)

Basalt (Basalt (composition: Plagioclase, Pyroxene, and Olivine)) — igneous

Basalt

Basalt (composition: Plagioclase, Pyroxene, and Olivine)

Basalt (River Pebble) (Basalt) — igneous

Basalt (River Pebble)

Basalt

Amygdaloidal Basalt (Amygdaloidal Basalt (extrusive volcanic rock with mineral inclusions)) — igneous

Amygdaloidal Basalt

Amygdaloidal Basalt (extrusive volcanic rock with mineral inclusions)

Gabbro (Water-Worn Cobble) (Gabbro) — igneous

Gabbro (Water-Worn Cobble)

Gabbro

Vesicular Basalt (Iron-Stained) (Mafic Volcanic Rock (Basalt)) — igneous

Vesicular Basalt (Iron-Stained)

Mafic Volcanic Rock (Basalt)

Pink Granite (Phaneritic Plutonic Rock (Granite with K-Feldspar)) — igneous

Pink Granite

Phaneritic Plutonic Rock (Granite with K-Feldspar)

Granite (Granite) — igneous

Granite

Granite