Mudstone
Argillite / Siliciclastic sedimentary rock
sedimentary
Category
Man Made Material (Metal)
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Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Tumbled/River Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Quartz / Quartzite
Silicon Dioxide (SiO2)
Mineral / Metamorphic
Limestone
Calcite (CaCO3)
sedimentary
Chert (or possibly Flint)
Chert (variant: Flint)
Sedimentary
Tumbled blue-dyed stone, likely basalt or blue aventurine
Likely fine-grained basalt (plagioclase and pyroxene), possibly coated or dyed; exact identification requires testing
igneous
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide matrix
sedimentary
Petrified Wood
Petrified Wood (Silicified Wood)
fossil
Quartzite
Quartzite (primarily SiO2)
Metamorphic
Limestone
Sedimentary rock composed mainly of calcium carbonate (CaCO3)
sedimentary
Tumbled green jasper (probable serpentine-rich stone)
Jasper, microcrystalline quartz (SiO₂), possibly mixed with serpentine or chlorite
mineral
Chert or Chalcedony
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossilized Stingray Mouth Plate
Myliobatidae gen. et sp. indet. (e.g., Myliobatis, Aetobatus)
fossil
Petoskey Stone
Hexagonaria percarinata
fossil
Pyrite
Iron Disulfide (FeS2)
mineral
Jasper
Silicon Dioxide (SiO2)
mineral
Asphalt (Bituminous Concrete)
Bituminous mix / Anthropogenic conglomerate
man-made composite (lithified equivalent of sedimentary)
Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Mudstone
Lutylite (group of fine-grained sedimentary rocks)
sedimentary
Polished tiger’s-eye cabochon (probable)
Quartz variety, SiO₂, with fibrous riebeckite/crocidolite-derived inclusions
metamorphic
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of cellulose)
fossil
Quartzite
Quartz-rich metamorphic rock; chiefly SiO₂
metamorphic
Biotite schist (likely graphite-bearing)
Mica schist; chiefly quartz + biotite mica, with possible graphite and feldspar
metamorphic
Coquina / Limonite-stained Limestone
Sedimentary Limestone with Iron Oxyhydroxide (FeO(OH)·nH2O)
sedimentary
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Aquamarine
Beryl (Be3Al2Si6O18), specifically the blue-green variety
Mineral
Petrified Wood
Silicified Wood (SiO2 as Quartz/Chert/Chalcedony)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Likely weathered quartz-rich stone or fossil fragment
Indeterminate; possibly quartz-bearing sandstone, iron-stained quartz, or a fragmentary fossil
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Tumbled blue stone, likely blue aventurine or dyed quartz
Quartz (SiO₂), possibly with fuchsite inclusions; exact identification requires testing
mineral
Weathered iron-rich rock, likely laterite or ironstone
Ferruginous laterite/ironstone, composed mainly of goethite (FeO(OH)), hematite (Fe₂O₃), and clay minerals
sedimentary
Rounded iron-stained quartzite or sandstone pebble
Quartzite, predominantly SiO₂, with iron-oxide staining
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Siltstone
Siltstone (composed of clastic quartz and feldspar grains)
sedimentary
Siltstone
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary