Tumbled red jasper
Jasper, microcrystalline quartz (SiO₂), commonly colored by iron oxides
mineral
Category
Synthetic Polymer (Synthetic Material)
Browse synthetic polymer (synthetic material) specimens identified by the Rock Identifier community.
Learn about Synthetic Polymer (Synthetic Material) in the encyclopedia
View all →
Decorative polished pebbles
Likely mixed quartz-rich lithologies, including quartzite, jasper, and/or basalt
mineral
Iron meteorite candidate
Likely iron-rich meteorite, possibly an ordinary chondrite or weathered iron meteorite; confirmation requires testing
meteorite
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Shark Tooth Fossil
Selachii fossil
fossil
Fossil Shark Tooth
Chondrichthyes tooth fossil
fossil
Starfish Fossil
Asteroidea fossil
fossil
Fossil Seashell
Invertebrate fossil (Bivalvia)
fossil
Fossil Shell (Bivalve)
Phylum Mollusca, Class Bivalvia
fossil
Jasper
Silicon Dioxide (Microcrystalline Quartz, $SiO_2$)
sedimentary
Fulgurite
Fulgurite (Lechatelierite / Vitreous Silica)
mineral
Fossiliferous Limestone / Petrifaction
Sedimentary rock with fossil inclusions / Calcium Carbonate (CaCO3)
fossil
Petrified Wood / Jasper Chert
Silicified Wood / Microcrystalline Quartz (SiO2)
sedimentary
Chert with Iron Inclusions
Microcrystalline Quartz (SiO2) with Hematite/Limonite
sedimentary
Fossilized Shark Tooth
Chondrichthyes (Class) - likely Carcharodon or Otodus genus
fossil
Chondrite Meteorite
Ordinary Chondrite (Undifferentiated Meteorite)
meteorite
Tektite
Tektite (meteoritic glass)
meteorite
Chert (or Chalcedony) Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Fossil Shark Tooth (Sand Tiger Shark type)
Carcharias sp. (likely Odontaspis)
fossil
Microcrystalline Quartz (Chert/Agate)
Silicon Dioxide (SiO2)
sedimentary
Chalcedony (Fire Agate or Carnelian variety)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2) in Host Rock
sedimentary
Green Jasper
Jasper (Silicates, SiO2)
sedimentary
Fossilized Brachiopod
Phylum Brachiopoda (replaced by Calcite/CaCO3)
sedimentary
Tiger's Eye
SiO2 (Silicon Dioxide with Iron Oxide inclusions)
Mineral (Metamorphic pseudomorph)
Chert (Jasper-bearing)
Microcrystalline silica (SiO2) with iron oxide inclusions
sedimentary
Bivalve Fossil in Sedimentary Matrix
Fossiliferous Mudstone (Class: Bivalvia)
sedimentary
Fossilized Shark Tooth
Bioapatite (Calcium Hydroxyapatite) replacement
mineral
Quartz with impurities or Host Rock
SiO2 (Silicon Dioxide) with mixed silicates
mineral
Chert (Fossiliferous)
Silicon dioxide (SiO2)
sedimentary
Chert (often found as Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Gneiss
Gneissic Metamorphic Rock
metamorphic
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Cullet Glass (Man-made Glass Slag)
Amorphous Silica (SiO2) with chemical additives
Mineraloid
Polished rhyolite (likely porphyritic rhyolite)
Rhyolite, composed chiefly of quartz and alkali feldspar with minor plagioclase, biotite, and iron oxides
igneous
Weathered volcanic rock, likely andesite or basalt
Fine-grained mafic to intermediate volcanic rock; probable andesite–basalt, compositionally dominated by plagioclase with pyroxene and possibly alteration minerals
igneous
Banded Gneiss
Gneiss
metamorphic
Leopard Skin Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary