Vesicular Basalt (Amygdaloidal)
Vesicular Basalt (Fe-Mg rich extrusive volcanic rock)
igneous
Category
Synthetic Polymer (Synthetic Material)
Browse synthetic polymer (synthetic material) specimens identified by the Rock Identifier community.
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Chert (specifically Flint or Common Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony/Opal replacing organic matter)
sedimentary
Flint (within Limestone matrix)
Silicon dioxide (SiO2)
sedimentary
Gneiss
Foliated Metamorphic Rock (Gneiss)
metamorphic
Chondrite Meteorite
Stony Meteorite (L, H, or LL Chondrite)
igneous
Chert (Flint variety)
Silicon dioxide (SiO2)
sedimentary
Grey Jasper (Tumbled Quartz variant)
Jasper (Silicon Dioxide, SiO2)
sedimentary
Chert (Nodule)
Microcrystalline quartz (SiO2)
sedimentary
Piddock bored rock (likely Mudstone or Shale)
Ichnofossil (Gastrochaenolites borings) in Fine-grained Sedimentary Rock
sedimentary
Chert (specifically Flint or Dark Chert)
Chert (SiO2)
sedimentary
Diamond (Macled/Crystal fragment)
Carbon (C), isometric crystal system
mineral
Coquina Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Tumbled-looking granite pebble
Granite, chiefly quartz–feldspar with biotite/amphibole
igneous
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Granite
Intrusive igneous rock composed mainly of quartz, alkali feldspar, and plagioclase
igneous
Flint nodule
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Chert / Flint Arrowheads and Artifacts
Cryptocrystalline quartz (SiO2)
sedimentary
Chert
Microcrystalline quartz (SiO2)
sedimentary
Chert (Arrowhead Artifact)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Jasper or Flint)
Silicon Dioxide (SiO2)
sedimentary
Granite Pebble
Granite
igneous
Chert (Arrowheads)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Chert (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Orbicular jasper (likely ocean jasper)
Silica-rich microcrystalline quartz/chalcedony with iron-oxide and other mineral inclusions; SiO₂
mineral
Fossiliferous limestone
Bioclastic limestone, primarily calcite (CaCO₃)
sedimentary
Green aventurine (likely)
Quartz variety; silicon dioxide (SiO₂) with green fuchsite mica inclusions
mineral
White quartz pebble
Quartz (SiO₂), likely milky quartz
mineral
Bivalve Internal Mold Fossil
Steinkern (Bivalvia mold)
fossil
Weathered limestone or calcareous sandstone
Calcite-rich carbonate rock, chiefly calcium carbonate (CaCO₃), possibly fossiliferous limestone
sedimentary
Chert (Flint Nodules)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Tumbled quartz (likely milky quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Slate
Metamorphic rock (fine-grained, foliated)
metamorphic
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace Ti, Fe, or Mn
mineral