Blue Crackle Quartz (Dyed Quarzite)
Silicon Dioxide (SiO2) with artificial dye
Metamorphic (modified)
Category
Metamorphic (Modified)
Browse metamorphic (modified) specimens identified by the Rock Identifier community.
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Lapis Lazuli
Lapis Lazuli (Complex aggregate of Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2, Pyrite, and Calcite)
metamorphic
Unakite
Altered Granite (Unakite)
metamorphic
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Quartz Heart or Arrowhead Shape
Silicon Dioxide (SiO2)
mineral
River Cobble (likely Basalt or Metagraywacke)
Non-specific water-worn lithic fragment
igneous or metamorphic
Polished brecciated jasper
Microcrystalline quartz (SiO₂), commonly with hematite/goethite and iron-rich alteration minerals
metamorphic
Pink Tiger's Eye
Silicified Riebeckite Asbestos (SiO2)
metamorphic
Quartzite Arrowhead (Archaeological Lithic)
Recrystallized Quartz (SiO2)
metamorphic
Granite / Gneiss (Coarse-Grained Felsic Rock)
Granite (Quartz-Feldspar-Mica aggregate)
igneous
Chert Arrowhead (Projectile Point)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Pet Rock (Quartzite/Sandstone River Rock)
Silicon Dioxide (SiO2) mixture
sedimentary
Painted Rock
Weathered Sedimentary Rock (Painted)
sedimentary
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Arrowhead Artifact)
Chert (SiO2)
sedimentary
Chert (Arrowhead/Projectile Point)
Microcrystalline quartz (SiO2)
sedimentary
Sandstone (with man-made markings)
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Obsidian Arrowhead
Volcanic Glass (predominantly SiO2)
igneous
Pet Rock (Man-made Quartzite or Granite Cobble)
Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica
igneous or metamorphic (base stone); anthropogenic (decoration)
Chert (Arrowhead/Projectile Point)
Microcrystalline quartz (SiO2)
sedimentary
Likely polished garnet fragment
Garnet group, possibly almandine (Fe₃Al₂Si₃O₁₂)
gemstone
Chert (Arrowhead Artifact)
Microcrystalline Quartz (SiO2)
sedimentary
Chert Arrowhead
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert Arrowhead (Lithic Artifact)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Chert Arrowhead
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert / Flint Arrowheads and Artifacts
Cryptocrystalline quartz (SiO2)
sedimentary
Chert Arrowhead / Prehistoric Artifact
Cryptocrystalline Quartz (SiO2) - Artifact
sedimentary
Painted River Rock
Anthropogenic-modified Siliciclastic Sedimentary Rock
Sedimentary
Polished amethyst geode
Quartz, SiO₂ (purple variety: amethyst), with banded chalcedony/agate
gemstone
Purple fluorite cluster
Fluorite (calcium fluoride, CaF₂)
mineral
Chert (Arrowhead artifact)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Chondrite Meteorite
Ordinary Chondrite (Undifferentiated Stony Meteorite)
meteorite
Nutting Stone / Cupstone (Sandstone or Quartzite)
Sedimentary rock with anthropogenic modification (cupule)
sedimentary
Painted Garden Rock
Coated Siltstone or Mudstone
sedimentary
Chert Arrowhead (Lithic Tool)
Microcrystalline quartz (SiO2) - Archeological lithic artifact
sedimentary
Chert (Arrowhead)
Microcrystalline Quartz (SiO2)
sedimentary
Chert Arrowhead (Projectile Point)
Microcrystalline Quartz (SiO2)
sedimentary
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Arrowhead/Projectile Point)
Cryptocrystalline Quartz (SiO2)
sedimentary
Amethyst crystal (likely quartz)
Quartz, crystalline silica (SiO₂), purple variety amethyst
gemstone
Amethyst stalactite slice pendant
Amethyst (紫 quartz), SiO₂, with concentric quartz/chalcedony and likely agate banding
mineral
Chert (Arrowhead/Tool variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary