Chert (Flint / Quartz Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Anthropogenic Material (Man Made Sedimentary Mimic)
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Natural or Cultured Pearl
Calcium Carbonate (Aragonite and Conchiolin), CaCO3
Mineral (Organic)
Quartzite
Silica (SiO2) quartzite
metamorphic
Granite
Granite (Felsic Plutonic Rock)
igneous
Chert Pebble/Nodule
Chert (a microcrystalline or cryptocrystalline sedimentary form of quartz, SiO2)
Sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Pearls (likely freshwater cultured pearls)
Pearl: nacre, primarily aragonite (CaCO₃) with conchiolin
gemstone
Carved quartz (likely rose quartz and green aventurine/quartz)
Quartz, silicon dioxide (SiO₂); green material may be aventurine quartz or serpentine
gemstone
Diorite
Intermediate plutonic igneous rock
igneous
Iron Slag
Ferrous Slag (Industrial Byproduct)
mineraloid (anthropogenic byproduct)
Diorite
Diorite
igneous
Diamond
Carbon (C)
gemstone
Chalk
CaCO3 (primarily Calcium Carbonate), biogenic sedimentary rock
Sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Coquina and Oyster Fossil Rock
Coquina limestone (Calcium Carbonate, CaCO3) containing fossilized Crassostrea / bivalve shells
fossil
Chalk
Micrite (primarily Calcium Carbonate or CaCO3)
sedimentary
Chert (with Quartz)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Water-worn Cobble)
Arenite (SiO2 with CaCO3 or Fe2O3 cement)
sedimentary
Iron Slag
Ferrous Slag (Silicate/Oxide mixture)
industrial byproduct (anthropogenic)
Fossiliferous Limestone
Limestone (composed primarily of calcite with included fossils CaCO3)
Sedimentary
Granite
Granite (a plutonic rock)
Igneous
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Fossilized oyster shell
Bivalvia; likely an oyster (Ostreidae), partly mineralized with calcite
fossil
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Diamond (Faceted)
Carbon (C)
gemstone
Likely weathered iron-rich rock or slag fragment
Uncertain; possibly limonite/goethite-rich material (FeO(OH)·nH₂O)
mineral
Chert Arrowhead (Jasper)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Chert (Flint nodule)
Chert (SiO2)
sedimentary
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Flint
SiO2 (Cryptocrystalline Quartz)
sedimentary
Brecciated Jasper
Brecciated Jasper (Microcrystalline Quartz / SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Phaneritic Igneous Rock (composed mostly of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Ferro-Manganese Slag
Vitreous Silicate Slag
Anthropogenic (Industrial byproduct)
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Diamond
Carbon (C)
gemstone
Banded agate pendant (likely carnelian or brown-and-white chalcedony agate)
Agate, a banded variety of chalcedony; microcrystalline quartz, SiO₂, with iron-oxide coloration
gemstone
Diamond
Carbon (C)
gemstone
Synthetic Resin (Artificial Specimen)
Polyurethane or Polyester Resin
mineraloid (man-made)
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Tumbled brown chalcedony (likely jasper or agate)
Microcrystalline quartz, SiO₂; chalcedony with iron-oxide staining
mineral
Goldstone
Avventurina (Cu + SiO2 glass)
mineral