Chert (variously known as Flint or Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Category
Man Made Material (Jewelry, Metal Alloy)
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Quartzite in Conglomerate
Clastic Sedimentary Rock with Silicon Dioxide (SiO2) inclusions
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Fossilized Shark Tooth
Chondrichthyes (Class) - likely Carcharodon or Otodus genus
fossil
Fossilized Shark Tooth
Bioapatite (Calcium Hydroxyapatite) replacement
mineral
Asphalt (Bituminous Concrete)
Bituminous mix / Anthropogenic conglomerate
man-made composite (lithified equivalent of sedimentary)
Chert / Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Pyrite (Fool's Gold) Cube
Iron Sulfide (FeS2)
mineral
Yellow Jade (Quartzite Jade)
Quartzite (SiO2)
gemstone
Tufa Rock and Tumbled Gemstones
Calcareous Tufa (Calcium Carbonate, CaCO3)
sedimentary
Diamond
Carbon (C)
gemstone
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide)
metamorphic
Snowflake Obsidian
Vitreous volcanic silicate (SiO2 with Cristobalite inclusions)
Igneous
Fossilized Shark Tooth
Chondrichthyes (class)
fossil
Shark Tooth Fossil
Vertebrate fossilized tooth
fossil
Jasper
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Rose Quartz
SiO2 (Silicon Dioxide)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with hydrated iron oxide impurities (Goethite)
sedimentary
Chert (Flint/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Ocean Jasper
Orbicular Jasper (Silicon Dioxide - SiO2)
sedimentary
Likely chlorite-bearing schist (possibly greenschist)
Chlorite–quartz–mica schist; commonly contains muscovite/biotite and feldspar
metamorphic
Fossil Coral
Phylum Cnidaria / Rugosa or Tabulata
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Tektite (Indochinite)
Natural glass (High-silica impact glass)
mineral
Chalcedony
Silicon dioxide (SiO2)
mineral
Chert (Jasper/Agate)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Tumbled pale green aventurine (probable)
Quartz, SiO₂, with dispersed fuchsite or other green inclusions
mineral
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Chert (Flint)
Chert (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Banded Calcite (Mexican Onyx)
Calcium Carbonate (CaCO3)
sedimentary
Chert (or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula: SiO2)
sedimentary
Rounded brown pebble, likely chert or iron-stained quartzite
Chert (microcrystalline quartz, SiO₂) or quartzite (recrystallized quartz, SiO₂)
sedimentary
Vesicular volcanic scoria (likely weathered basaltic scoria)
Scoria; chiefly vesicular basalt, composed mainly of plagioclase, pyroxene, and iron-rich glass
igneous
Chert (Jasper/Agate mix)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Chert (Jasper/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary