Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Category
Anthropogenic (Man Made Artifact)
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Flint (or Chert)
Silicon dioxide (Microcrystalline Quartz, $SiO_2$)
sedimentary
Blue Chert
Microcrystalline Quartz (SiO2)
sedimentary
Exposed aggregate concrete (stone-chip surface)
Portland-cement concrete containing natural aggregate; not a natural rock
sedimentary
Turquoise
Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
gemstone
Granodiorite Pebble
Granodiorite
igneous
Jade Ring
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)
gemstone
Baltic Amber (Raw)
Succinite
fossil
Moqui Marbles
Iron Oxide Concretion (Hematite/Goethite)
sedimentary
Engineered Quartz Stone
Agglomerated Quartz (SiO2 + Polymer Resin)
mineral-based composite
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
Diabase (Dolerite)
Diabase / Dolerite
igneous
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Sandstone Concretion
Clastic sedimentary rock (primarily Quartz SiO2 with mineral cement)
sedimentary
Land Snail Shell
Gastropoda (Calcium Carbonate, CaCO3)
fossil
Goldstone (aventurine glass)
Synthetic copper-bearing soda-lime glass; commonly sold as red goldstone
gemstone
Obsidian Arrowhead
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Pearl
Biogenic CaCO3 (Aragonite and Calcite)
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Fossilized Coral (Coquina/Limestone)
Cnidaria Anthozoa (Fossilized)
sedimentary
Iron-rich vesicular rock, possibly slag or weathered basalt
Identification uncertain; likely ferruginous basalt/ironstone, with possible anthropogenic iron slag
igneous
Flint
SiO2 (Cryptocrystalline Quartz)
sedimentary
Chert (Flint / Quartz Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (White Chert/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Gypsum (Satin Spar / Alabaster variety)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Pearl (Biogenic Mineraloid)
Calcium carbonate (CaCO3) primarily as Aragonite
mineral
Granite
Plutonic Igneous Rock (composed typically of SiO2, Al2O3, K2O, Na2O, CaO)
igneous
Lava Rock (Dyed)
Basalt / Volcanic scoria
igneous
Black Flint
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
US Penny
Cuprum (Copper: Cu) and Zincum (Zinc: Zn) Alloy
Man-made object (metal alloy)
Granodiorite
Granodiorite (NaCa0.5(AlSi3O8)2(Fe,Mg)2)
igneous
Siltstone Pebble
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Engineered Quartz (Quartzite look-alike)
Silicon Dioxide (SiO2) composite
mineral-based composite
Amber
Succinited (fossilized tree resin)
fossil
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Flint
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Flint
Cryptocrystalline quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Chert / Flint
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert Nodule (Flint)
Microcrystalline Quartz (SiO2)
sedimentary