Banded Chert (River Stone)
Silicon Dioxide (SiO2)
sedimentary
Category
Anthropogenic Specimen (Man Made)
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Sandstone (likely Quartzose)
Clastic sedimentary rock (SiO2 primary)
sedimentary
Dumortierite in Quartz
Dumortierite (Al6O3(BO3)(SiO4)3) with Quartz (SiO2)
mineral
Black Chert River Stone
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert
Silicon dioxide (SiO2)
Sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Banded Chert / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Fossilized echinoid (sea urchin), likely a flint/chalk-associated test
Echinoid fossil; likely a regular echinoid such as Echinocidaris or related taxon, composed mainly of recrystallized calcite (CaCO₃)
fossil
Chert Arrowhead
Chert (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Chert (Flint/Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Chert Arrowhead
Cryptocrystalline microcrystalline Quartz (SiO2)
sedimentary
Quartzite Arrowhead (Archaeological Lithic)
Recrystallized Quartz (SiO2)
metamorphic
Desert Rose (Gypsum)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Aventurine
Aventurine Quartz (SiO2 with inclusions of Fuchsite)
metamorphic
Diamond
Natural Diamond (Carbon, C)
gemstone
Terrazzo (with Marble and Granite fragments)
Cementitious or resinous composite containing Calcium Carbonate (CaCO3) and Silicates
sedimentary (man-made composite)
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 inclusions)
sedimentary
Pink Granite (Alkali-feldspar Granite)
Felsic intrusive igneous rock (composition: KAlSi3O8, SiO2, NaAlSi3O8)
igneous
Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8) with Albite inclusions
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Diamond (in a jewelry setting)
Diamond (Carbon, C)
mineral
Chert (specifically Jasper or Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Rutilated Quartz
Quartz with Rutile inclusions (SiO2 with TiO2)
mineral
Iron-stained quartz-rich rock, possibly jasper or chert
Microcrystalline quartz (SiO₂) with iron oxides/hydroxides
mineral
Smoky Quartz (Faceted)
Silicon Dioxide (SiO2)
gemstone
Chert (Arrowhead Debitage or Flake)
Microcrystalline silica (SiO2)
sedimentary
Cobalt Glass Slug (Man-made Glass)
Amorphous Silica with Cobalt Oxide (SiO2 + CoO)
mineraloid
Man-made Metal Pin (Non-geological)
Antimony-Lead Alloy or Zinc/Brass Base with Electroplating
Metal Alloy / Manufactured Artifact
Riverstone (Sandstone Pebble)
Arenite (SiO2 with various lithic fragments)
sedimentary
Chert
Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Green cabochon gemstone, likely aventurine or dyed chalcedony
Indeterminate from image; possible quartz variety (SiO₂), including aventurine quartz or chalcedony
gemstone
Chert (Polished River Pebble)
Chert (SiO2)
sedimentary
Dark gray rounded stone, possibly basalt or slag
Uncertain; likely fine-grained basalt (plagioclase–pyroxene) or iron-rich industrial slag
igneous
Native Silver
Silver (elemental Ag)
mineral
Tumbled orbicular granite
Granite, predominantly potassium feldspar, plagioclase, quartz, and biotite/hornblende
igneous
Megalodon Shark Tooth
Otodus megalodon
fossil
Sand Tiger Shark Tooth (Fossil)
Carcharias taurus (fossilized dentin/enameloid)
fossil
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Blue Slag Glass
Amorphous Silica (Industrial byproduct)
Antropogenic (Man-made glass byproduct)
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary