Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Category
Organic Structure (Not A Rock)
Browse organic structure (not a rock) specimens identified by the Rock Identifier community.
Learn about Organic Structure (Not A Rock) in the encyclopedia
View all →
Sandstone (Wonderstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
River Pebble (likely Quartzite or Siltstone)
Sedimentary Clast (SiO2 based)
sedimentary
Granite
Intrusive igneous rock
igneous
Melo Melo Pearl (or Golden Chalcedony / Yellow Jasper Sphere)
Non-nacreous calcium carbonate pearl (or SiO2 - Silicon Dioxide)
gemstone
Basalt with Granite Inclusions (Xenoliths)
Mafic igneous rock (Basalt) with Sialic minerals
igneous
Tree Agate
Silicon Dioxide with inclusions (SiO2)
mineral
Jasper (Green Jasper / Chert)
Silicon Dioxide (SiO2 with inclusions)
mineral
Sandstone
Arenite (Sedimentary Rock)
sedimentary
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Chert (varieties: Flint or Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Red Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Painted Sandstone
Sandstone (clastic sedimentary rock) with acrylic/artistic coating
sedimentary
Quartz Vein in Host Rock
Silicon dioxide (SiO2) veining in silicate matrix
sedimentary
Granite
Intrusive igneous rock composed mainly of quartz, alkali feldspar, and plagioclase
igneous
Greenstone
Metabasalt / Metavolcanic rock
metamorphic
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Chert (and its variety Flint)
Silicon Dioxide (SiO2) - Microcrystalline or cryptocrystalline Quartz
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Coquina / Fossiliferous Limestone
Coquina (composed primarily of Calcium Carbonate / CaCO3)
sedimentary
Dalmation Jasper (or Dalmation Stone)
Dalmation Stone (composed of Perthite, Quartz, and Arfvedsonite)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Amber
Succinate (Fossilized Tree Resin)
mineraloid
Unakite
Epidotized Granite (Composed of Orthoclase Feldspar, Epidote, and Quartz)
metamorphic
Unakite
Epidote-Feldspar rock
Metamorphic Rock
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (Brown Variety)
Silicon dioxide (SiO2)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Calcite / CaCO3)
fossil
Shale
Clastic Sedimentary Rock
sedimentary
Dalmatian Stone
Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite
igneous
Brecciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Amber
Succinite (Fossilized Tree Resin)
gemstone
Vesicular Basalt (Lava Rock)
Vesicular Basalt (comprising plagioclase feldspar and pyroxene group minerals)
igneous
Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Desert Rose (Baryte or Selenite)
Barium Sulfate (BaSO4) or Hydrous Calcium Sulfate (CaSO4·2H2O)
mineral
Eroded Brick or Pumice-like Scoria
Vesicular Basalt / Scoria (Anthropogenic variant: Eroded Firebrick)
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Pumice
Pumice (Vesicular Rhyolite/Andesite)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary