Tumbled chalcedony or carnelian
Microcrystalline quartz (SiO₂), likely iron-bearing chalcedony
mineral
Category
Man Made Material (Jewelry, Metal Alloy)
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Chert (Common Opal variant)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Jasper Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Tumbled Jasper and Tiger's Eye
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Chert (or Carnelian Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Fossilized Coral (Petoskey Stone type)
Hexagonaria percarinata (Fossilized Rugose Coral)
fossil
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Shark Tooth Fossil
Vertebrate fossilized tooth (Chondrichthyes)
fossil
Black tourmaline beads (likely schorl)
Schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄
mineral
Fossil Shark Tooth
Chondrichthyes (class)
fossil
Lapis Lazuli
Lapis Lazuli (Complex silicate mineral mix including Lazurite, Pyrite, and Calcite)
metamorphic
Yellow Chert or Jasper
Silicon Dioxide (SiO2)
sedimentary
Seashell Fossil
Gastropoda fossil
fossil
Fossil Shark Tooth
Chondrichthyes (Class)
fossil
Fossilized Gastropod Shell
Class Gastropoda (Fossil)
sedimentary
Iron-stained quartzite or quartz-rich sandstone
Quartzite, predominantly SiO₂, with iron-oxide staining
metamorphic
Jasper
Silicon dioxide (Microcrystalline quartz, SiO2)
mineral
Turquoise cabochon
Turquoise; hydrated copper–aluminum phosphate, approximately CuAl6(PO4)4(OH)8·4H2O (composition varies)
gemstone
Sandstone
Sandstone (lithified arenite/wacke)
Sedimentary Rock
Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Diorite (Dalmatian Stone)
Phaneritic Plutonic Diorite
igneous
Chert / Flint
SiO2 (Silicon Dioxide)
sedimentary
Green Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Fossilized shell fragment
Indeterminate fossil mollusk; likely a silicified or mineral-replaced bivalve/gastropod fragment
fossil
Green Turban Shell (Polished)
Turbo marmoratus (Aragonite/Calcite)
mineral
Diamond (or Simulant)
Carbon (C) or various simulants (e.g., Cubic Zirconia)
gemstone
Rough Diamond
Diamond (Native Carbon, C)
mineral
Clear Quartz (Faceted) or Cubic Zirconia / Glass imitation
SiO2 (if Quartz), ZrO2 (if Cubic Zirconia)
mineral
Chert (Flint)
Microcrystalline silica (SiO2)
sedimentary
Petrified Wood
Silicified wood (SiO2)
fossil
Chert (Holey Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement)
fossil
Weathered brown stone, likely sandstone or iron-stained granite
Indeterminate; possible quartz-rich sandstone (quartz, feldspar, iron oxides)
sedimentary
Likely schist, possibly serpentinite
Mica schist; potential chlorite–serpentine-rich metamorphic rock
metamorphic
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Fossil Shark Tooth
Carcharodon sp. (likely Otodus or similar Lamniformes order)
sedimentary
Polished banded agate
Chalcedony (microcrystalline quartz), SiO₂
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral