Carnelian
Carnelian (SiO2 - Silicon Dioxide with Iron Oxide impurities)
mineral
Category
Basalt
Browse basalt specimens identified by the Rock Identifier community.
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Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Greenschist
Chlorite schist (Metamorphic rock dominated by chlorite, epidote, and actinolite)
metamorphic
Basalt River Stone (Tumbled)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Porphyritic Andesite
Andesite (Porphyry)
igneous
Gabbro
Phaneritic Mafic Igneous Rock
igneous
Basalt with Magnetite inclusions
Basalt (Mafic silicate rock) potentially containing Magnetite (Fe3O4)
igneous
Basalt with Quartz/Calcite Inclusion
Aphanitic Mafic Igneous Rock (Basalt) with SiO2 or CaCO3 vein
igneous
Porphyritic Basalt (Chinese Writing Stone)
Porphyritic Basalt or Andesite containing plagioclase feldspar phenocrysts
igneous
Porphyritic Basalt (Flowerstone)
Porphyritic Basalt (Mafic volcanic rock)
igneous
Vesicular Basalt with Oxidized Crust
Vesicular Basalt (Iron-rich extrusive volcanic rock)
igneous
Amethyst (Geode Fragment)
Silicon Dioxide with iron impurities (SiO2)
mineral
Ruby
Corundum (Al2O3:Cr)
mineral
Larimar
Blue Pectolite (NaCa2Si3O8(OH))
mineral
Carnelian
Carnelian (a variety of Chalcedony), SiO2 (Silicon Dioxide)
mineral
Amethyst (Quartz Variety)
Amethyst (Silicon Dioxide - SiO2 with ferric iron impurities)
mineral
Amethyst Geode
Amethyst (Silicon Dioxide, SiO2 with iron impurities)
mineral
Chinese Writing Stone
Porphyritic Basalt or Andesite with Feldspar phenocrysts (likely Orthoclase or Plagioclase)
igneous
Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Chalcedony (Carnelian Agate pebble)
Silicon Dioxide (SiO2)
mineral
Peridotite
Peridotite (Ultramafic Rock)
igneous
Flower Agate (Plume Agate)
Chalcedony (Silicon Dioxide) with Spherulitic Inclusions - SiO2
mineral
Carnelian (Red Chalcedony)
Silicon Dioxide (SiO2)
mineral
Greenstone
Metabasalt / Greenschist facies rock
Metamorphic
Andesite
Andesite (intermediate volcanic rock)
igneous
Amethyst on Agate/Host Rock
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst Geode
Amethyst (SiO2) - Silicon Dioxide with Trace Iron Impurities
mineral
Carnelian
Carnelian (Silicon Dioxide, SiO2)
mineral
Peridot (Olivine)
Olivine (Magnesium Iron Silicate), (Mg,Fe)2SiO4
mineral
Peridotite
Peridotite (varieties include Dunite, Lherzolite, Harzburgite)
igneous
Botryoidal Chalcedony (Agate)
Cryptocrystalline Quartz (SiO2)
mineral
Precious Opal in Matrix
Hydrated Silica (SiO2·nH2O)
mineral
Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Riverstone (Sandstone Pebble)
Arenite (SiO2 with various lithic fragments)
sedimentary
Purple Dyed Agate Geode (Banded Chalcedony)
Silicon Dioxide (SiO2) - variety: Agate
mineral
Asphalt (Bituminous Concrete)
Composite material (bitumen binder with mineral aggregate)
man-made rock (technosol)
Basalt with Quartz/Calcite Veins
Basalt (Aphanitic Mafic Volcanic Rock) with Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) inclusions
igneous
Chalcedony (Botryoidal Agate)
Silicon Dioxide (SiO2)
mineral
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Sunstone
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
mineral
Carnelian
SiO2 (Chalcedony with iron oxide impurities)
mineral
Basalt with Quartz/Calcite Veins
Aphanitic Mafic Igneous Rock with Hydrothermal Veining
igneous