Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Mineral And Organic Gemstone
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Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Nodule)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Fossil Shark Tooth
Chondrichthyes (class)
fossil
Graphite
Graphite (Carbon, C)
mineral
Graphite
Carbon (C)
mineral
Sandstone with Quartz Crystal Infill
Quartz-cemented quartz arenite
sedimentary
Mammoth Molar Fossil
Mammuthus primigenius (Tooth fragment)
fossil
Banded Chert / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Tumbled amber
Amber (fossilized plant resin), commonly succinite; organic mineraloid
gemstone
Amber (likely beach-worn amber or resinous material)
Fossilized plant resin; predominantly organic terpenoid polymers (succinite)
gemstone
Petrified Wood
Silicified Wood (SiO2)
mineral
Amber
Succinite (fossilized tree resin)
mineraloid / sedimentary organic material
Banded Chert
Silicon Dioxide (SiO2)
sedimentary
Chert (and/or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Mookaite Jasper
Silicified Radiolarite (SiO2 with iron impurities)
sedimentary
Red heart-shaped glass bead in a wire-wrapped jewelry charm
Likely colored glass (amorphous silica-based material); the image does not show an identifiable geological specimen
gemstone
Fossil Shark Tooth
Selachii fossil
fossil
Mammoth Tooth
Mammuthus tooth
fossil
Fossilized Tooth
Vertebrate Fossilized Tooth (Mineralized Biogenic Material)
fossil
Fairy Stone (Menilite Concretion)
Carbonate-rich concretion (often Siderite or Calcite in Clay)
sedimentary
Chert (Iron-stained)
Silicon Dioxide (SiO2)
sedimentary
Glauconitic Sandstone
Glauconitic Quartz Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)
sedimentary
Chert
Silicon dioxide (SiO2)
Sedimentary
Chert (includes Flint & Jasper)
Chert (Siliceous sedimentary rock, chemical formula SiO2)
sedimentary
Petrified Wood
Silicified wood (SiO2)
fossil
Abalone Shell / Mother of Pearl
Haliotis sp. (Nacreous shell layer)
fossil
Quartz-rich pegmatite (milky quartz with feldspar)
Quartz (SiO₂)–feldspar pegmatite, likely containing albite or orthoclase
igneous
Fossilized Wood / Petrified Wood
Petrified Wood (Silicified Flora)
fossil
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (varieties include Flint and Jasper)
Silicon Dioxide (SiO2)
sedimentary
Graphite
Graphite (Carbon, C)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Succinite
Organic Mineraloid
Hypersthene
Hypersthene ((Mg,Fe)SiO3)
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Polished agate (likely plume or moss agate)
Chalcedony, microcrystalline quartz (SiO₂), with iron-oxide and possible chlorite inclusions
mineral
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2 with chlorite inclusions)
mineral
Moss Agate
Silicon Dioxide (SiO2) with Chlorite/Oxide inclusions
mineral
Moss Agate
Chalcedony (SiO2) with dendritic inclusions of Manganese or Iron oxide
mineral
Chalcedony / Agate with Botryoidal Quartz
Silicon Dioxide (SiO2)
sedimentary