Rock Identifier

Category

Igneous Rock

Browse igneous rock specimens identified by the Rock Identifier community.

Quartz Pebble (Quartz (Silicon Dioxide, SiO2)) — mineral

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Carnelian (Carnelian (a variety of Chalcedony); SiO2 (Silicon Dioxide)) — mineral

Carnelian

Carnelian (a variety of Chalcedony); SiO2 (Silicon Dioxide)

Quartz / Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz / Milky Quartz

Silicon Dioxide (SiO2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Rough Agate/Chert Nodules (Cryptocrystalline Quartz (SiO2)) — sedimentary

Rough Agate/Chert Nodules

Cryptocrystalline Quartz (SiO2)

Carnelian (Carnelian Chalcedony (SiO2 with Iron Oxide impurities)) — mineral

Carnelian

Carnelian Chalcedony (SiO2 with Iron Oxide impurities)

Quartz (specifically Milky/Gray Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (specifically Milky/Gray Quartz)

Silicon Dioxide (SiO2)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Gneiss (Cobble) (Gneiss) — metamorphic

Gneiss (Cobble)

Gneiss

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Greenstone (Metabasalt / Chlorite-Epidote Schist) — metamorphic

Greenstone

Metabasalt / Chlorite-Epidote Schist

Amygdaloidal Basalt (Amygdaloidal Basalt (Mafic volcanic rock with secondary mineral fillings)) — igneous

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock with secondary mineral fillings)

Basalt with Plagioclase Phenocrysts (Porphyritic Basalt (primarily SiO2, MgO, FeO, and CaO)) — Igneous

Basalt with Plagioclase Phenocrysts

Porphyritic Basalt (primarily SiO2, MgO, FeO, and CaO)

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

Pumice

Pumice (a highly vesicular volcanic glass)

Pumice (Pumice (volcanic glass with vesicular texture)) — igneous

Pumice

Pumice (volcanic glass with vesicular texture)

Porphyritic Andesite (Andesite) — igneous

Porphyritic Andesite

Andesite

Pumice (Pumicite) — igneous

Pumice

Pumicite

Rose Quartz (Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese) — mineral

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Greenschist (Greenschist facies rock (containing chlorite, actinolite, and epidote)) — metamorphic

Greenschist

Greenschist facies rock (containing chlorite, actinolite, and epidote)

Quartz (Rose or Clear variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Rose or Clear variety)

Silicon Dioxide (SiO2)

Nuummite (Nuummite (Orthoamphibole rock composed of Anthophyllite and Gedrite, (Mg,Fe)7Si8O22(OH)2)) — metamorphic

Nuummite

Nuummite (Orthoamphibole rock composed of Anthophyllite and Gedrite, (Mg,Fe)7Si8O22(OH)2)

Gneiss (Metamorphic Rock) (Gneiss) — metamorphic

Gneiss (Metamorphic Rock)

Gneiss

Obsidian (Obsidian (principally SiO2)) — igneous

Obsidian

Obsidian (principally SiO2)

Granite (Granite (composed primarily of Quartz SiO2, Alkali Feldspar KAlSi3O8, and Plagioclase)) — igneous

Granite

Granite (composed primarily of Quartz SiO2, Alkali Feldspar KAlSi3O8, and Plagioclase)

River Stone (likely Siltstone or fine-grained Basalt) (Clastic Sedimentary (Siltstone) or Mafic Igneous (Basalt)) — sedimentary or igneous

River Stone (likely Siltstone or fine-grained Basalt)

Clastic Sedimentary (Siltstone) or Mafic Igneous (Basalt)

sedimentary or igneous

Gneiss with Quartz Veining (Gneiss (High-grade regional metamorphic rock)) — metamorphic

Gneiss with Quartz Veining

Gneiss (High-grade regional metamorphic rock)

Yellow Quartz (Citrine Quartz Pebble) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Citrine Quartz Pebble)

Silicon Dioxide (SiO2)

Basalt with Plagioclase Phenocrysts (Porphyritic Basalt) (Porphyritic Basalt (primarily Plagioclase Feldspar, Pyroxene, and Olivine)) — igneous

Basalt with Plagioclase Phenocrysts (Porphyritic Basalt)

Porphyritic Basalt (primarily Plagioclase Feldspar, Pyroxene, and Olivine)

Iron-Nickel Meteorite (Possible Chondrite or Oxidized Iron) (Siderite (Nickel-Iron) or Chondrite (Si/Fe composite)) — igneous

Iron-Nickel Meteorite (Possible Chondrite or Oxidized Iron)

Siderite (Nickel-Iron) or Chondrite (Si/Fe composite)

Basalt (Mafic Volcanic Rock (primarily Plagioclase and Pyroxene)) — Igneous

Basalt

Mafic Volcanic Rock (primarily Plagioclase and Pyroxene)

Basalt (Mafic Volcanic Rock (composed mainly of Plagioclase, Pyroxene, and Olivine)) — igneous

Basalt

Mafic Volcanic Rock (composed mainly of Plagioclase, Pyroxene, and Olivine)

Amygdaloidal Basalt (Amygdaloidal Basalt (Mafic Extrusive)) — igneous

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Extrusive)

Yellow Quartz (Citrine or Iron-stained Quartz) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Pyrite (on Quartz/Host Rock) (Iron Sulfide (FeS₂)) — mineral

Pyrite (on Quartz/Host Rock)

Iron Sulfide (FeS₂)

Peacock Ore (Bornite or Chalcopyrite treated with acid) (Bornite (Cu5FeS4) or Acid-washed Chalcopyrite (CuFeS2)) — mineral

Peacock Ore (Bornite or Chalcopyrite treated with acid)

Bornite (Cu5FeS4) or Acid-washed Chalcopyrite (CuFeS2)

Gneiss (Gneiss (High-grade Metamorphic Rock)) — metamorphic

Gneiss

Gneiss (High-grade Metamorphic Rock)

Gneiss (Gneiss (High-grade regional metamorphic rock)) — metamorphic

Gneiss

Gneiss (High-grade regional metamorphic rock)

Clear Quartz Crystal (Quartz (Silicon Dioxide, SiO2)) — mineral

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Snowflake Obsidian (Volcanic Glass with Cristobalite inclusions) — igneous

Snowflake Obsidian

Volcanic Glass with Cristobalite inclusions

Porphyritic Basalt (Chinese Writing Stone/Flower Stone) (Porphyritic Basalt (primarily Plagioclase Feldspar in a Mafic groundmass)) — igneous

Porphyritic Basalt (Chinese Writing Stone/Flower Stone)

Porphyritic Basalt (primarily Plagioclase Feldspar in a Mafic groundmass)

Amygdaloidal Basalt (Vesicular Basalt with secondary mineral infilling (commonly Zeolites, Calcite, or Quartz)) — igneous

Amygdaloidal Basalt

Vesicular Basalt with secondary mineral infilling (commonly Zeolites, Calcite, or Quartz)