Snowflake Obsidian
Spherulitic Obsidian (SiO2 + impurities)
igneous
Category
Igneous
Browse igneous specimens identified by the Rock Identifier community.
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Rhyolite
Rhyolite (High-silica volcanic rock)
igneous
Porphyritic Basalt (or Andesite) Pebble
Porphyritic Mafic Volcanic Rock
igneous
Granite
Granite (composition: Quartz, Feldspar, Mica)
igneous
Basalt
Basalt (aphanitic mafic volcanic rock)
igneous
Basalt
Basalt
igneous
Olivine (Peridotite)
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
igneous
Basalt
Basalt
igneous
Pegmatite (Granitic)
Granitic Pegmatite containing Quartz, Feldspar, and Tourmaline (Schorl)
igneous
Diorite (Salt and Pepper Rock)
Diorite
igneous
Basalt (Crushed Stone)
Basalt
igneous
Orbicular Granite (specifically Mustard or Yellow Tonalite/Granodiorite)
Orbicular Quartz Diorite / Tonalite
igneous
Basalt with Calcite Veins
Aphanitic mafic volcanic rock with CaCO3 inclusions
igneous
Lunar Meteorite (Feldspathic Breccia)
Lunar Achondrite (Regolith Breccia)
igneous
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite inclusions (SiO2 + Fe2O3)
Igneous
Diorite (Salt and Pepper Rock)
Diorite
igneous
Granite
Granite
igneous
Granite
Granite
igneous
Olivine (Peridotite)
Magnesium Iron Silicate - (Mg, Fe)2SiO4
igneous
Obsidian Arrowhead
Volcanic Glass (predominantly SiO2)
igneous
Mahogany Obsidian
Obsidian (Volcanic Glass) with Hematite/Magnetite inclusions
igneous
Basalt with Phenocrysts (Porphyritic Basalt)
Porphyritic Basalt (primarily Plagioclase and Pyroxene)
igneous
Obsidian (Gold Sheen)
Obsidian (SiO2 + impurities)
igneous
Pumice
Pumice (Vesicular Rhyolite/Andesite)
igneous
Granite (Weathered)
Granitic intrusive rock
igneous
Basalt Porphyry
Porphyritic Basalt
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
igneous
Granite
Granite
Igneous
Basalt
Basalt (composition of Plagioclase feldspar and Pyroxene)
igneous
Scoria (with Iron Oxidation)
Vesicular Basalt / Scoria
igneous
Granite (specifically Red Granite)
Phaneritic Plutonic Rock (High in Alkali Feldspar and Quartz)
igneous
Pink Granite (Gneissic Granite)
Granite (composed primarily of Quartz, K-Feldspar, and Plagioclase)
igneous
Pumice
Pumice (Vesicular Rhyolite/Andesite)
igneous
Amygdaloidal Basalt
Basalt with secondary amygdule minerals (likely Epidote or Chlorite)
igneous
Scoria (Lava Rock)
Scoria (Basaltic Scoria)
Igneous
Rhyolite Pebble
Rhyolite
igneous
Olivine-rich Basalt with Peridotite Xenoliths
Porphyritic Basalt containing Dunite/Peridotite (Mg,Fe)2SiO4
igneous
Wonderstone
Banded Rhyolite (SiO2 with impurities)
igneous
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
igneous
Bumblebee Jasper
Fossiliferous Volcanic Rock (composed of Calcium Carbonate, Manganese Oxides, and Arsenic Sulfides)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Granite
Granite
igneous