Rock Identifier

Category

Igneous

Browse igneous specimens identified by the Rock Identifier community.

Porphyritic Basalt (Chinese Writing Stone) (Porphyritic Basalt with Andalusite or Feldspar laths) — igneous

Porphyritic Basalt (Chinese Writing Stone)

Porphyritic Basalt with Andalusite or Feldspar laths

Granodiorite (Granodiorite) — igneous

Granodiorite

Granodiorite

Basalt (Basalt (composition predominately Plagioclase feldspar and Pyroxene)) — igneous

Basalt

Basalt (composition predominately Plagioclase feldspar and Pyroxene)

Granite Cobble (Felsic intrusive igneous rock (composition: SiO₂ with KAlSi₃O₈, NaAlSi₃O₈, and CaAl₂Si₂O₈)) — igneous

Granite Cobble

Felsic intrusive igneous rock (composition: SiO₂ with KAlSi₃O₈, NaAlSi₃O₈, and CaAl₂Si₂O₈)

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

Basalt (River Pebble) (Basalt (dominated by Plagioclase Feldspar and Pyroxene)) — igneous

Basalt (River Pebble)

Basalt (dominated by Plagioclase Feldspar and Pyroxene)

Granitic Pegmatite (River Rock specimen) (Granite / Pegmatite (composed of SiO2, KAlSi3O8, and NaAlSi3O8)) — igneous

Granitic Pegmatite (River Rock specimen)

Granite / Pegmatite (composed of SiO2, KAlSi3O8, and NaAlSi3O8)

Olivine in Basalt (Peridot) (Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) within Basalt (Rock)) — igneous

Olivine in Basalt (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) within Basalt (Rock)

Pumice (Pumice (a highly vesicular volcanic rock)) — igneous

Pumice

Pumice (a highly vesicular volcanic rock)

Olivine in Basalt (Peridot) (Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) / Scoriaceous Basalt (Host Rock)) — igneous

Olivine in Basalt (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) / Scoriaceous Basalt (Host Rock)

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

Snowflake Obsidian

Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)

Obsidian (Obsidian (principally SiO2 with MgO and Fe3O4)) — igneous

Obsidian

Obsidian (principally SiO2 with MgO and Fe3O4)

Granite (Phaneritic plutonic rock (dominated by Quartz, Feldspar, and Mica)) — igneous

Granite

Phaneritic plutonic rock (dominated by Quartz, Feldspar, and Mica)

Basalt (Greenstone) (Amygdaloidal Basalt / Chloritized Basalt) — Igneous

Basalt (Greenstone)

Amygdaloidal Basalt / Chloritized Basalt

Andesite (Andesite) — igneous

Andesite

Andesite

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

Granite

Phaneritic Plutonic Felsic Rock (SiO2 > 69%)

Diorite (Diorite) — igneous

Diorite

Diorite

Obsidian (Arrowhead Lithic Tool) (Obsidian (Amorphous Volcanic Glass / SiO2 + inclusions)) — igneous

Obsidian (Arrowhead Lithic Tool)

Obsidian (Amorphous Volcanic Glass / SiO2 + inclusions)

Mahogany Obsidian (Volcanic glass containing Hematite or Magnetite (SiO2 + Fe2O3)) — igneous

Mahogany Obsidian

Volcanic glass containing Hematite or Magnetite (SiO2 + Fe2O3)

Labradorite (Labradorite (Ca, Na)(Al, Si)4O8) — igneous

Labradorite

Labradorite (Ca, Na)(Al, Si)4O8

Gold Ore in Quartz (Auriferous Quartz (Au + SiO2)) — igneous

Gold Ore in Quartz

Auriferous Quartz (Au + SiO2)

Lepidolite on Pegmatite (Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2) in Granitic Pegmatite) — igneous

Lepidolite on Pegmatite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2) in Granitic Pegmatite

Tektite (likely Indochinite) (Tektite (high-silica impact glass)) — igneous

Tektite (likely Indochinite)

Tektite (high-silica impact glass)

Porfido (Porphyritic Rock) (Porphyry (often Rhyolitic or Andesitic)) — igneous

Porfido (Porphyritic Rock)

Porphyry (often Rhyolitic or Andesitic)

Diorite (Diorite (Intermediate plutonic rock)) — igneous

Diorite

Diorite (Intermediate plutonic rock)

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

Diabase

Diabase (also known as Dolerite)

Black Obsidian (Volcanic Glass (SiO2)) — igneous

Black Obsidian

Volcanic Glass (SiO2)

Granite (Phaneritic Plutonic Felsic Rock) — igneous

Granite

Phaneritic Plutonic Felsic Rock

Pumice (Pumice (volcanic rock)) — Igneous

Pumice

Pumice (volcanic rock)

Basalt River Stone (Basalt) — igneous

Basalt River Stone

Basalt

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

Black Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)

Obsidian (Volcanic Glass (SiO2 - Silicon Dioxide with impurities)) — Igneous

Obsidian

Volcanic Glass (SiO2 - Silicon Dioxide with impurities)

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

Granite

Granite (Phaneritic Quartz-Feldspar rock)

Orbicular Rhyolite (Rainforest Jasper) (Rhyolite containing Spherulites (SiO2 with impurities)) — igneous

Orbicular Rhyolite (Rainforest Jasper)

Rhyolite containing Spherulites (SiO2 with impurities)

Porphyritic Basalt (Chinese Flower Stone / Chrysanthemum Stone basalt variety) (Porphyritic Basalt containing Plagioclase Feldspar phenocrysts) — igneous

Porphyritic Basalt (Chinese Flower Stone / Chrysanthemum Stone basalt variety)

Porphyritic Basalt containing Plagioclase Feldspar phenocrysts

Basalt (tumbled/river-worn) (Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)) — igneous

Basalt (tumbled/river-worn)

Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)

Olivine in Basalt (Peridotite / Forsterite ((Mg,Fe)2SiO4)) — igneous

Olivine in Basalt

Peridotite / Forsterite ((Mg,Fe)2SiO4)

Apache Tear (Obsidian (Hydrated Volcanic Glass - SiO2)) — igneous

Apache Tear

Obsidian (Hydrated Volcanic Glass - SiO2)

Apache Tear (Obsidian) (Volcanic glass / Amorphous SiO2) — igneous

Apache Tear (Obsidian)

Volcanic glass / Amorphous SiO2

Mahogany Obsidian (Volcanic Glass (predominantly SiO2 with inclusions of Hematite or Magnetite)) — igneous

Mahogany Obsidian

Volcanic Glass (predominantly SiO2 with inclusions of Hematite or Magnetite)

Snowflake Obsidian (Spherulitic Obsidian (Amorphous volcanic glass with Phenocrysts of Cristobalite)) — igneous

Snowflake Obsidian

Spherulitic Obsidian (Amorphous volcanic glass with Phenocrysts of Cristobalite)

Pegmatite (Pegmatitic Granite) — igneous

Pegmatite

Pegmatitic Granite