Chert (specifically Yellow/Brown Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Sedimentary (Man Made Conglomerate)
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Obsidian
Volcanic glass (SiO2 - Silicon Dioxide)
igneous
Green Banded Chert (Agate/Jasper)
Silicon Dioxide (SiO2) with trace impurities of Chlorite or Glauconite
sedimentary
Chert (Flint variety)
Chert (Microcrystalline or Cryptocrystalline Quartz), SiO2
sedimentary
Diamond
Diamond (pure Carbon, C)
mineral
Megalodon Shark Tooth
Otodus megalodon
fossil
Slate
Metamorphic Pelitic Rock
metamorphic
Chert (Jasper/Flint variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz
Silicon dioxide (SiO₂)
Mineral
Granodiorite
Phaneritic Plutonic Intermediate-Felsic Rock
igneous
Diamond
Carbon (C)
mineral
Blue Lace Agate
Chalcedony (SiO2) with trace inclusions
mineral
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Porphyritic Basalt (with Amygdales)
Amygdaloidal Porphyritic Basalt
igneous
Chert (Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Turquoise
Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
gemstone
Engineered Quartz Stone
Agglomerated Quartz (SiO2 + Polymer Resin)
mineral-based composite
Diabase (Dolerite)
Diabase / Dolerite
igneous
Goldstone (aventurine glass)
Synthetic copper-bearing soda-lime glass; commonly sold as red goldstone
gemstone
Land Snail Shell
Gastropoda (Calcium Carbonate, CaCO3)
fossil
Quartz (likely Jasper or Chert variety)
Quartz (SiO₂)
Mineral
Pearl
Biogenic CaCO3 (Aragonite and Calcite)
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Pearl (Biogenic Mineraloid)
Calcium carbonate (CaCO3) primarily as Aragonite
mineral
Granite
Plutonic Igneous Rock (composed typically of SiO2, Al2O3, K2O, Na2O, CaO)
igneous
US Penny
Cuprum (Copper: Cu) and Zincum (Zinc: Zn) Alloy
Man-made object (metal alloy)
Pyrite
Iron Disulfide (FeS2)
mineral
Lava Rock (Dyed)
Basalt / Volcanic scoria
igneous
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Marble
Marble (metamorphosed limestone or dolostone), primarily composed of calcite (CaCO3) or dolomite (CaMg(CO3)2)
metamorphic
Engineered Quartz (Quartzite look-alike)
Silicon Dioxide (SiO2) composite
mineral-based composite
Diamond (or Cubic Zirconia)
Carbon (C) or Zirconium Dioxide (ZrO2)
gemstone
Vesicular Basalt (or Scoria)
Vesicular Basalt
igneous
Pyrite
Iron Sulfide (FeS2)
mineral
Granite
Phaneritic Plutonic Felsic Rock
igneous
Granite
Granite (Phaneritic igneous rock)
igneous
Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Carved quartz skull, likely smoky quartz or gray chalcedony
Silicon dioxide (SiO₂), quartz or microcrystalline quartz
gemstone
Turquoise
Turquoise, CuAl6(PO4)4(OH)8·4H2O
mineral
Diamond
Cubic carbon (C)
mineral
Red Slag Glass (Cullet)
Amorphous Silicon Dioxide (SiO2) with metallic dopants
Antropogenic (Man-made material)
Quartz (Engineered Quartz Surface)
Silicon Dioxide (SiO2) based composite
mineral (man-made composite)