Granite river rock
Granite (composed of Quartz, Feldspar, and Mica)
igneous
Category
Igneous Rock
Browse igneous rock specimens identified by the Rock Identifier community.
Learn about Igneous Rock in the encyclopedia
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Lava Rock (Scoria)
Scoria (Vesicular Basalt)
igneous
Diabase (Trap Rock)
Diabase (also known as Dolerite)
igneous
Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Lava Rock (Scoria)
Extrusive basaltic scoria
igneous
Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Quartz on Host Rock
Silicon Dioxide (SiO2)
Mineral Specimen
Greenstone Porphyry
Altered Porphyritic Andesite/Basalt
igneous
Quartz Druze on Matrix (Geode Fragment)
Quartz (Silicon Dioxide, SiO2)
mineral
Greenshist / Chlorite Schist
Chlorite schist (contains (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)
metamorphic
Emerald in Matrix (Quartz/Schist)
Beryl (Be₃Al₂Si₆O₁₈) with Chromium/Vanadium impurities
mineral
Greenstone (Greenschist)
Greenschist facies rock (containing chlorite, epidote, actinolite)
metamorphic
Blue Sapphire
Corundum (Al2O3 - Aluminum Oxide with Iron and Titanium impurities)
mineral
Clear Quartz Sphere
Quartz (Silicon Dioxide, SiO2)
mineral
Granite
Granite (composed mainly of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Basalt
Mafic volcanic rock (various silicate minerals including Pyroxene and Plagioclase)
igneous
Pumice
Pumice (Vesicular Volcanic Glass)
igneous
Black Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide with impurities)
igneous
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Rhyolite
Rhyolite (High-silica volcanic rock)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Rhyolite
Rhyolite (High-silica volcanic rock)
igneous
Granitic Quartz with Feldspar
Granite (composed primarily of SiO2 and KAlSi3O8)
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Clear Quartz Geode
Crystalline Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Granitic Gneiss
Gneiss (Metamorphic rock of granitic composition)
metamorphic
Gneiss
Gneiss
metamorphic
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Granite Gneiss
Gneiss (high-grade metamorphic rock)
metamorphic
Quartz (in a rock matrix)
Quartz (SiO2)
mineral
Basalt with Quartz Veining
Mafic Volcanic Rock with Silicate Micro-veins
igneous
Quartz Veined Basalt Pebble
Amygdaloidal Basalt with Quartz (SiO2) veining
igneous
Porphyritic Basalt (Chinese Writing Stone)
Porphyritic Basalt or Porphyritic Andesite
igneous