Flint / Chert
Silicon dioxide (SiO2)
sedimentary
Category
Biogenic Material
Browse biogenic material specimens identified by the Rock Identifier community.
Learn about Biogenic Material in the encyclopedia
View all →
Chalky Limestone
Carbonate sedimentary rock (CaCO3)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (specifically Flint)
Silicon Dioxide (SiO2)
sedimentary
Slag
Glassy silicate byproduct (anthropogenic material)
industrial byproduct
Asphalt concrete
Anthropogenic conglomerate
sedimentary
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint Nodule)
Microcrystalline quartz (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Ore)
FeO(OH)·nH2O
mineral
Banded Jasper
Silicate Mineral (Microcrystalline Quartz / SiO2)
sedimentary
Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Shungite
Non-crystalline carbon (allotrope of carbon)
metamorphic
Sandstone
Clastic sedimentary rock (primarily quartz arenite)
sedimentary
Concrete / Anthropogenic Conglomerate
Man-made composite material (Portland cement, aggregate, and water)
not a natural rock
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Shark Tooth Fossil
Carcharocles megalodon or similar extinct shark tooth
fossil
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Fossilized Shark Tooth (Partial) or Coprolite
Elasmobranchii (fossil) or Coprolite (trace fossil)
fossil
Graphite
Graphite (Carbon, C)
mineral
Chondrite Meteorite
Ordinary Chondrite (L, LL, or H type)
meteorite
Brown Quartz (Jasper or Chert)
Silicon Dioxide (SiO2)
sedimentary
Terrazzo (Synthetic Composite Rock)
Cementitious or Epoxy Resin-bound Aggregates
Man-made metamorphic-style composite
Concrete Fragment
Hardened Portland cement and mineral aggregate
sedimentary (anthropogenic)
Concrete Rubble with Aggregate
Hardened Portland Cement Paste with Coarse Aggregate
Anthropogenic (Man-made)
Honey-colored chalcedony (possibly yellow/orange agate or carnelian)
Chalcedony, a microcrystalline variety of quartz; SiO₂. The color may result from iron-oxide inclusions. Exact identification is uncertain from a photograph alone.
gemstone
Tumbled amethyst
Amethyst, purple quartz (SiO₂), colored by trace iron and irradiation
gemstone
Tumbled amethyst
Quartz, crystalline silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation
gemstone
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Native American Hammerstone / Pitted Stone
Modified lithic artifact (often quartzite, basalt, or granite)
artifact / sedimentary or igneous rock
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Likely weathered mica schist fragment
Mica schist, chiefly muscovite/biotite mica with quartz and feldspar
metamorphic
Milky Quartz with Chlorite/Amphibite Inclusions
Silicon Dioxide (SiO2) with various mineral inclusions
mineral
Amber (Green variation)
Succinite
fossil
Fossilized Coral (Petoskey Stone type)
Hexagonaria percarinata (Fossilized Rugose Coral)
fossil
Asphalt
Asphalt concrete (engineered material, not a naturally occurring rock/mineral in this form)
Sedimentary