Green Aventurine and Clear Quartz
Green Aventurine (Silicon Dioxide - SiO2 with Fuchsite inclusions); Clear Quartz (Silicon Dioxide - SiO2)
Mineral
Category
Man Made Material, Not A Natural Rock Or Mineral Specimen
Browse man made material, not a natural rock or mineral specimen specimens identified by the Rock Identifier community.
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Tektite
Natural impact glass
meteorite
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Quartz (Variety: Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Obsidian Arrowhead
Volcanic Glass (SiO2)
igneous
Limestone with Chert
Sedimentary Rock (CaCO3 with SiO2 inclusions)
sedimentary
Fossilized bivalve shell fragment
Fossil Mollusca, likely a bivalve (class Bivalvia); exact genus cannot be determined from the image
fossil
Pink quartz bead necklace/strand
Quartz, silicon dioxide (SiO₂), likely rose quartz or pink chalcedony; exact identification is uncertain from the image
gemstone
Granite
Granite (composed of Quartz, Felspar, and Mica)
igneous
Conglomerate
Conglomerate rock
sedimentary
Weathered quartz-bearing rock, possibly granite or gneiss
Indeterminate; likely quartz–feldspar–mica aggregate, possibly granitic gneiss
igneous
Conglomerate (Pebble Conglomerate)
Conglomerate
sedimentary
Carved Gemstone Mushroom
Quartz / Feldspar composite (Carved lapidary art)
gemstone
Corundum
Corundum (Aluminium oxide, Al2O3)
mineral
Limestone (River Pebble)
Calcium Carbonate (CaCO3)
sedimentary
Dyed pink agate slice
Agate (microcrystalline quartz, SiO₂), commonly chalcedony with artificial dye
mineral
Weathered iron-rich rock, possibly meteorite
Uncertain; likely goethite/hematite-rich material, with meteorite possibility
mineral
Chert (Common Opal/Chalcedony mixture)
Silicon Dioxide (SiO2)
sedimentary
Vesicular Rhyolite
Rhyolite (High-silica volcanic rock)
igneous
Citrine
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Volcanic glass with Cristobalite inclusions (70–75% SiO2)
igneous
Quartzite
Quartzite (principally SiO2)
metamorphic
Jasper Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Granite; predominantly quartz, potassium feldspar, plagioclase, and biotite/hornblende
igneous
Black Onyx or Dyed Agate Node
Cryptocrystalline Quartz (SiO2)
mineral
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Likely weathered sandstone or iron-stained quartzite fragment
Quartz-rich sandstone (predominantly SiO₂; exact identification uncertain from image)
sedimentary
Chert / Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Blue Lace Agate (often dyed)
Silicon dioxide (SiO2) - variety of chalcedony
mineral
Sandstone with Quartz Sphere
Arenite (SiO2-rich sedimentary rock) with Quartzite/Rose Quartz sphere
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Orange Calcite
Calcite (CaCO3)
mineral
Fossiliferous Limestone
Carbonate sedimentary rock (CaCO3) with bioclasts
sedimentary
Granite
Phaneritic intrusive igneous rock (Granite)
igneous
Quartzite pebble
Metamorphic rock (mainly SiO2)
metamorphic
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Blue Howlite (Dyed)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Granite Pebble
Intrusive Igneous Rock
igneous
Red Sandstone
Arenite with Hematite cementation
sedimentary
Native American Hammerstone / Pitted Stone
Modified lithic artifact (often quartzite, basalt, or granite)
artifact / sedimentary or igneous rock
Sandstone (Ferruginous)
Arenite (Fe2O3 stained)
sedimentary