Chert (Black Chert or Flint)
Silicon Dioxide (SiO2)
sedimentary
Category
Biogenic Material
Browse biogenic material specimens identified by the Rock Identifier community.
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Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Banded Chert
Silicon Dioxide (SiO2)
sedimentary
Chert (varietal Flint)
Silicon Dioxide (SiO2)
sedimentary
Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Tektite (Indochinite)
Tektite (High-silica natural glass)
mineraloid / impact glass
Chert (or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Diamond
Diamond (C)
mineral
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Tektite (Indochinite)
Tektite (Amorphous Silica Glass)
igneous
Chert / Flint
Chert (SiO2)
sedimentary
Synthetic Marbled Aggregate (Footwear Component)
Ethylene-vinyl acetate (Croslite™)
not a rock (man-made polymer)
Chert (Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony/Opal replacing organic matter)
sedimentary
Flint (within Limestone matrix)
Silicon dioxide (SiO2)
sedimentary
Vesicular Basalt (Amygdaloidal)
Vesicular Basalt (Fe-Mg rich extrusive volcanic rock)
igneous
Chert (specifically Flint or Common Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Gneiss
Foliated Metamorphic Rock (Gneiss)
metamorphic
Grey Jasper (Tumbled Quartz variant)
Jasper (Silicon Dioxide, SiO2)
sedimentary
Chert (Flint variety)
Silicon dioxide (SiO2)
sedimentary
Chert (Nodule)
Microcrystalline quartz (SiO2)
sedimentary
Chondrite Meteorite
Stony Meteorite (L, H, or LL Chondrite)
igneous
Chert (specifically Flint or Dark Chert)
Chert (SiO2)
sedimentary
Diamond (Macled/Crystal fragment)
Carbon (C), isometric crystal system
mineral
Piddock bored rock (likely Mudstone or Shale)
Ichnofossil (Gastrochaenolites borings) in Fine-grained Sedimentary Rock
sedimentary
Tumbled-looking granite pebble
Granite, chiefly quartz–feldspar with biotite/amphibole
igneous
Weathered granite or granitic gneiss fragment
Granite, predominantly quartz, feldspar, and dark mica/amphibole
igneous
Rounded white pebble, likely quartz-rich rock
Most consistent with quartzite or milky-quartz pebble; exact identification requires testing
sedimentary
Weathered iron-rich sandstone or laterite fragment
Ferruginous sandstone, chiefly quartz (SiO₂) cemented or stained by iron oxides/hydroxides
sedimentary
Weathered granite or granitic gneiss
Granite: quartz, feldspar, and mica; possibly weakly foliated gneiss
igneous
Carved quartz skull, likely smoky quartz or gray chalcedony
Silicon dioxide (SiO₂), quartz or microcrystalline quartz
gemstone
Tumbled quartz-rich pebble
Microcrystalline quartz (SiO₂), possibly weathered chert or chalcedony
mineral
Milky quartz with iron-oxide staining
Quartz (silicon dioxide, SiO₂)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Green Aventurine
Aventurine Quartz (SiO2 with inclusions of Fuchsite mica)
mineral
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