Chert with Quartz Vein
Microcrystalline Quartz (SiO2)
sedimentary
Category
Mineraloid Like Synthetic Material
Browse mineraloid like synthetic material specimens identified by the Rock Identifier community.
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Beach Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Banded chert or silicified limestone nodule
Microcrystalline quartz (SiO₂), possibly replacing carbonate fossils
sedimentary
Petrified Wood
Silicon Dioxide (SiO2) - Calcified / Silicified Wood
sedimentary
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Common Opal/Jasper variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (specifically Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Concrete
Anthropogenic Sedimentary Conglomerate (Cement mixture: typically Ca2SiO4, Ca3SiO5, Ca3Al2O6)
sedimentary (artificial)
Fossil gastropod shell
Fossilized marine gastropod; exact genus/species requires locality and examination
fossil
Chert
Channery Chert (Microcrystalline Quartz)
sedimentary
Banded Agate
Agate (chalcedony variety of Silicon Dioxide, SiO2)
mineral
Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint or River Stone)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Arrowhead Preform)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Chert / Pink Flint
Cryptocrystalline Quartz (SiO2)
sedimentary
Conglomerate with Fossilized Shark Teeth
Clastic sedimentary rock (Conglomerate) containing Elasmobranchii remains
sedimentary
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Lepidodendron Plant Fossil
Lepidodendron sp. (Lycopodiophyta)
fossil
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Weathered granite or granitic gneiss fragment
Coarse quartz–feldspar–mica aggregate; possibly weakly foliated gneiss
igneous
Greenstone (Metabalt)
Chlorite schist / Epidiorite
metamorphic
Coquina
Biogenic Limestone (Calcite/Aragonite base, CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone with Quartz Vein
Arenite with hydrothermal quartz intrusion
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Travertine (or Calcareous Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Red Sandstone
Arenite (Iron-rich)
sedimentary
Sandstone (with Lichen)
Arenite (composed primarily of SiO2)
sedimentary
Red Quartzite
Quartzite (SiO2)
metamorphic
Schist (with Iron Oxide)
Mica Schist
metamorphic
Sandstone (likely Quartzose Sandstone)
Arenite
sedimentary
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock type)
sedimentary