Basalt
Extrusive Igneous Rock
igneous
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
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Copper Ore (with Malachite and Azurite)
Hydroxide copper carbonate (Cu2CO3(OH)2 / Cu3(CO3)2(OH)2)
mineral
Pebble (likely Sandstone or Granitic Pebble)
Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)
Rock (likely Sedimentary)
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Opalite
Synthetic Opalised Glass
glass
Lapis Lazuli
Lapis Lazuli (Metamorphic rock primarily composed of Lazurite, Calcite, and Pyrite)
rock
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Garnet (likely Pyrope or Almandine)
Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.
Mineral
Corundum (variety Ruby/Sapphire)
Aluminum Oxide (Al2O3)
mineral
Fluorite (Green Fluorite)
Calcium Fluoride (CaF2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Pumice
Pumice (a vesicular volcanic glass)
igneous
Red Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Basalt Pebble
Extrusive Igneous Rock
igneous
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Basalt
Mafic volcanic rock (various silicate minerals including Pyroxene and Plagioclase)
igneous
Banded Calcite (often sold as "Peaches and Cream" or "Orange Calcite")
Calcium Carbonate (CaCO3)
mineral
Indigo Gabbro (also known as Mystic Merlinite)
Gabbro (composed of Plagioclase Feldspar, Pyroxene, and minor Magnetite/Ilmenite)
igneous
Aventurine (likely Green Aventurine)
Silicon Dioxide (SiO2) with various inclusions
Mineral, variety of Quartz
Chalcedony on Matrix
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
igneous
Pumice
Pumice (volcanic glass froth)
igneous
Mossy Rock
Mixed lithology rock with Bryophyta (moss)
sedimentary
Quartz (Druzy) in host rock
SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)
Mineral
Quartz Geode Fragment
Crystalline Silicon Dioxide (SiO2)
mineral
Basalt (with Iron Staining)
Mafic Igneous Rock
igneous
Scoria
Scoria (vesicular basalt-andesite)
igneous
Pegmatite
Igneous Pegmatite
igneous
Basalt
Mafic volcanic rock (dominated by Plagioclase and Pyroxene)
igneous
Pumice
Pumice (volcanic rock)
Igneous
Magnetite / Ironstone
Iron(II,III) oxide (Fe3O4)
mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Epidote with Quartz Vein
Epidote-bearing metamorphic rock with quartz (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Basalt Pebble
Aphanitic Mafic Igneous Rock
igneous
Gneiss
Gneiss
metamorphic