Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Category
Igneous Rock (Volcanic Glass)
Browse igneous rock (volcanic glass) specimens identified by the Rock Identifier community.
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Scoria
Scoria (Vesicular Basaltic Rock)
igneous
Eclipse Stone (Kabamba Jasper)
Rhyolite with Aegirine (NaFe3+Si2O6)
metamorphic
Basalt with Granite Inclusions (Xenolith)
Mafic Igneous Rock (Basalt) with Felsic Igneous Inclusion (Granite)
igneous
Basalt (with possible epidote or olivine)
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Vesicular Basalt
Aphanitic Mafic Igneous Rock (mainly Plagioclase and Pyroxene)
igneous
Rounded granite cobble
Granite; chiefly quartz, feldspar, and mica/amphibole
igneous
Banded Agate (specifically Carnelian Agate)
Silicon dioxide (SiO2) - Chalcedony variety
mineral
Orbicular Rhyolite (Rainforest Jasper)
Rhyolite containing Spherulites (SiO2 with impurities)
igneous
Banded Rhyolite (or Gray Shale pebble)
Rhyolite (SiO2 with minor impurities)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Basalt Pebble
Basalt (Mafic Extrusive Volcanic Rock)
igneous
Basalt
Aphanitic Mafic Igneous Rock
igneous
Porphyritic Basalt or Porphyry
Porphyritic Extrusive Igneous Rock
igneous
Basalt
Basalt (Mafic Igneous Rock)
igneous
Diorite
Diorite (an intrusive igneous rock)
igneous
Basalt
Basalt (Extrusive Igneous Rock)
igneous
Diorite
Intermediate plutonic igneous rock
igneous
Basalt
Extrusive mafic igneous rock
igneous
Basalt
Aphanitic Mafic Igneous Rock
igneous
Vesicular Basalt with Secondary Mineral Inclusions
Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Basalt Pebble
Mafic Igneous Rock (Basalt/Diabase)
igneous
Basalt
Extrusive volcanic basalt
igneous
Porphyritic Basalt (Chinese Writing Stone or Flower Stone)
Porphyritic Basalt / Porphyry
igneous
Basalt
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Weathered volcanic rock, likely vesicular basalt or scoria
Basaltic volcanic rock; predominantly plagioclase, pyroxene, and possibly olivine with iron-oxide weathering
igneous
Pumice
Pumiceous rhyolite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Basalt
Extrusive igneous rock primarily composed of plagioclase and pyroxene
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Basalt with Plagioclase Phenocrysts (Porphyritic Basalt)
Porphyritic Basalt (primarily Plagioclase Feldspar, Pyroxene, and Olivine)
igneous
Dalmatian Stone (commonly Dyed)
Dalmatian Jasper (Peralkaline igneous rock)
igneous
Dalmation Stone
Peralkaline rhyolite (SiO2 with Arfvedsonite/Riebeckite)
igneous
Basalt River Stone
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Basalt Beach Pebble
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Basalt
Basalt (dominated by plagioclase feldspar and pyroxene)
igneous
Basalt
Mafic volcanic rock (formula mostly SiO2, MgO, FeO)
igneous
Obsidian
Extrusive igneous volcanic glass (rich in SiO2)
igneous
White Quartz
Silicon Dioxide (SiO2)
mineral
Weathered basaltic volcanic rock
Likely vesicular basalt or basaltic-andesite; chiefly plagioclase, pyroxene, and iron-bearing minerals
igneous
Basalt River Pebble
Basalt (fine-grained mafic igneous rock)
igneous
Dark gray fine-grained rock, likely basalt
Basalt; chiefly plagioclase feldspar and pyroxene, often with minor olivine and magnetite
igneous