Chinese Jade (Green Nephrite or Jadeite)
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)
gemstone
Category
Synthetic Polymer (Synthetic Material)
Browse synthetic polymer (synthetic material) specimens identified by the Rock Identifier community.
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Agate and Chalcedony Beads
Cryptocrystalline Quartz (SiO2)
gemstone
Laterite (Red Clay)
Laterite (Fe2O3 · nH2O and Al2O3 · nH2O)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Basalt
Mafic Extrusive Igneous Rock
igneous
River Pebbles and Cobbles
Mixed Siliciclastic Sediments (Quartzite, Chert, and Sandstone clasts)
sedimentary
Basalt
Aphanitic basaltic rock
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Granite
Phaneritic Igneous Rock (Granite)
igneous
Greenstone (River Pebble)
Metabasalt / Greenschist
metamorphic
Granite
Phaneritic Felsic Igneous Rock
igneous
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Basalt (Weathered)
Extrusive Igneous Rock (Mafic composition)
igneous
Petrified Wood
Silicified wood (SiO2 - Silicon Dioxide)
sedimentary
Turquoise (possible Howlite imitation)
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Diamond
Carbon (C)
mineral
Mother of Pearl and Onyx
Aragonite (Mother of Pearl) and Chalcedony (Onyx)
mineral
Siltstone with plant fossil impression
Sedimentary rock with Archaeopteris or Calamites flora impression
fossil
Petrified Wood
Silicified Wood (SiO2)
mineral
Chert (River Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Chalcedony/Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Blue magnesite beads
Magnesite (MgCO₃), likely stabilized or dyed; brown veining may reflect matrix or iron oxides
mineral
Petrified Wood
Silicified wood (principally Silicon Dioxide, SiO2)
sedimentary
Porphyritic rhyolite (likely lithophysal/vesicular rhyolite)
Rhyolite; chiefly quartz and alkali feldspar, with minor plagioclase and iron-bearing minerals
igneous
Polished brecciated jasper (likely septarian or iron-rich jasper)
Microcrystalline quartz (chalcedony), SiO₂, with iron oxides and possibly calcite or other rock fragments
sedimentary
Chert (White Chert)
Silicon Dioxide (SiO2)
sedimentary
Tumbled Dalmatian jasper
Quartz-rich alkali rhyolite, commonly marketed as Dalmatian jasper; chiefly quartz, feldspar, and dark amphibole/biotite inclusions
igneous
Coquina or Fossiliferous Limestone
Fossiliferous Calcarenite (CaCO3)
sedimentary
Polished brecciated jasper
Jasper, opaque microcrystalline quartz (SiO₂), likely brecciated jasper with iron-oxide and dark silicate inclusions
mineral
Red jasper (likely hematite-rich jasper)
Microcrystalline quartz (SiO₂) with iron oxides, chiefly hematite (Fe₂O₃)
mineral
Fossil shell fragment
Indeterminate molluscan bioclast, likely aragonite or calcite
fossil
Quartzite
Quartzite (Metamorphic rock primarily composed of SiO2)
metamorphic
Jasper
Silicon Dioxide (SiO2), Microcrystalline Quartz
sedimentary
Fossilized Shark Tooth
Chondrichthyes (class)
fossil
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Polished green aventurine
Quartzite or quartz-rich rock containing fuchsite mica; mainly SiO₂
mineral
Fossilized Bone
Vertebrate fossil (mineralized bone)
fossil
Jasper
Silicon dioxide (SiO2)
sedimentary