Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Category
Mineral Like Byproduct (Often Mistaken For Igneous Rock Or Meteorite)
Browse mineral like byproduct (often mistaken for igneous rock or meteorite) specimens identified by the Rock Identifier community.
Learn about Mineral Like Byproduct (Often Mistaken For Igneous Rock Or Meteorite) in the encyclopedia
View all →
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide staining (Fe2O3)
sedimentary
Lava Rock (Scoria)
Scoria (Mafic volcanic rock)
igneous
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
mineral
Mahogany Obsidian
Volcanic Glass (predominantly SiO2 with inclusions of Hematite or Magnetite)
igneous
Gemstone Tree Brooch (Agate and Quartz)
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Tourmaline (Multi-colored)
Complex Borosilicate (Na,Ca)(Li,Mg,Al,Fe)3Al6(BO3)3Si6O18(OH)4
mineral
Basalt
Mafic volcanic rock (Basalt)
igneous
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic plutonic rock (Felsic)
igneous
Clear/White Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Obsidian
Volcanic glass (Amorphous silicon dioxide)
igneous
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Red Sandstone
Ferruginous Sandstone
sedimentary
Quartz pebble
Silicon Dioxide (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Basalt
Extrusive Igneous Rock (Mafic)
igneous
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Red Garnet
Almandine Garnet (Fe3Al2(SiO4)3)
mineral
Geode with Quartz and Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
White Topaz
Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Microcrystalline/Gravel)
Silicon Dioxide (SiO2)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Diabase
Diabase (Dolerite)
igneous
Sandstone
Arenite (SiO2 based typically)
sedimentary
Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Fossilized Bone
Petrified Bone / Biogenic Sedimentary
fossil
Porfido (Porphyritic Rock)
Porphyry (often Rhyolitic or Andesitic)
igneous
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Porphyry
Porphyritic Igneous Rock
igneous
Brachiopod Fossil in Limestone
Phylum Brachiopoda embedded in sedimentary rock
fossil
Biotite Schist
Biotite Schist (Metamorphic Rock featuring K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
Yellow Quartz (Chalcedony or Agate)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary
Gneiss Pebble
Gneiss
metamorphic
Granodiorite
Granodiorite
igneous