Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Man Made Object (Simulant)
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Red gemstone ring, likely garnet or synthetic ruby
Possibly almandine garnet (Fe₃Al₂(SiO₄)₃) or corundum/ruby (Al₂O₃); image alone cannot distinguish
gemstone
Sandstone
Clastic Sedimentary Rock
sedimentary
Granodiorite
Granodiorite (intermediate intrusive igneous rock containing plagioclase, quartz, and K-feldspar)
igneous
Jasper (specifically a banded or dark variety)
Silicon Dioxide (SiO2) with impurities
sedimentary
Dumortierite in Quartz
Dumortierite (Al6O3(BO3)(SiO4)3) with Quartz (SiO2)
mineral
Brown Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Mother of Pearl (Nacre)
Calcium Carbonate (Aragonite) with organic conchiolin
gemstone
Chert Arrowhead
Chert (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Diamond
Carbon (C)
gemstone
Raw Diamond
Carbon (C)
gemstone
Granite
Phaneritic Felsic Igneous Rock
igneous
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Blue Chalcedony
Chalcedony (Silicon Dioxide, SiO2)
mineral
Chert (Flint/Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Amethyst
Silicon Dioxide (SiO2)
mineral
Chert (Common Opal/Jasper variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Pearl
Calcium Carbonate (mostly Aragonite), CaCO3 (with conchiolin)
mineral
Chert (and/or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Nacre (Mother of Pearl)
Nacre (Biogenic Aragonite/Calcite composite, CaCO3)
mineral
Petoskey Stone
Hexagonaria percarinata (Fossilized Coral)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Diamond (in jewelry setting)
Carbon (C)
mineral
Quartz (Smoky Quartz variant)
Silicon Dioxide (SiO2)
mineral
Chert (with nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Diamond (in jewelry setting)
Adamantine Carbon (C)
mineral
Basalt
Basalt (Mafic volcanic rock)
igneous
Chert (often called Flint)
Chert (SiO2)
sedimentary
Sea Shell (Fighting Conch Fragment)
Calcium Carbonate (CaCO3) - Strombus alatus fragment
sedimentary (biogenic)
Diorite
Intermediate plutonic igneous rock
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary (fossilized)
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Polished agate/chalcedony fragment
Microcrystalline quartz (SiO₂), likely banded chalcedony or agate
gemstone
Polished blue banded agate slice
Chalcedony (microcrystalline quartz), SiO₂, commonly with trace iron and other coloring elements
mineral
Chert (Flint)
Microcrystalline Silica (SiO2)
sedimentary
Red Sandstone
Arenite (with Iron Oxide / Hematite staining)
sedimentary
Black jade or dark serpentine cabochon
Jadeite (NaAlSi₂O₆) or nephrite amphibole; possibly serpentine (Mg₃Si₂O₅(OH)₄)
gemstone
Tumbled red jasper or carnelian
Cryptocrystalline quartz (chalcedony), SiO₂, likely iron-oxide colored
gemstone
Tumbled green aventurine
Quartz variety, mainly SiO₂ with fuchsite or other mica inclusions
mineral