Banded Chert (River Stone)
Silicon Dioxide (SiO2)
sedimentary
Category
Man Made Rock (Technosol)
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Sandstone
Arenite
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite
sedimentary
Granodiorite with Quartz Veining
Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins
igneous
Granodiorite
Granodiorite
Igneous
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Granite
Granite (a phaneritic intrusive igneous rock)
igneous
Polished orbicular granite heart
Granite, commonly quartz–alkali feldspar–plagioclase–biotite granite; exact locality-dependent
igneous
Petoskey Stone
Hexagonaria percarinata (Fossilized Coral)
sedimentary
Granodiorite
Granodiorite
igneous
Swirled Agate Bead
Silicon Dioxide (SiO2)
mineral
Diorite
Diorite (Plagioclase feldspar and amphibole/biotite)
igneous
Diamond (in a gold ring)
Diamond (pure carbon, C)
mineral
Granite
Granite (phaneritic felsic intrusive rock)
igneous
Granite
Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Coquina
Bioclastic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Banded Sandstone
Arenite with Liesegang banding
sedimentary
Granite
Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)
igneous
Sandstone (specifically Arkose or Quartz Arenite)
Arenite (primarily SiO2 with possible Feldspar)
sedimentary
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Basalt
Basalt (containing plagioclase, pyroxene, and olivine)
igneous
Small dark rock fragment
Uncertain; possibly weathered basalt or slag
mineral
Tumbled yellow jasper or chalcedony
Microcrystalline quartz, SiO₂; likely iron-oxide-bearing jasper/chalcedony
mineral
Chert (Chert / Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Diamond
Carbon (C)
gemstone
Amethyst (Tumbled Cabinet Stone)
Silicon Dioxide (SiO2) with iron impurities
mineral
Tumbled aqua glassy mineral specimen, likely chrysocolla or turquoise imitation
Uncertain from image; possible chrysocolla (hydrated copper aluminosilicate, variable composition) or dyed/man-made glass
mineral
River Pebbles (Chert and Quartzite)
Sedimentary Clastic Rock (Silica-rich)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Red Sandstone
Arenite (Fe2O3 enriched)
sedimentary
Sandstone
Arenite
sedimentary
Beaded gemstone bracelet, likely lapis lazuli and pale quartz/agate
Lapis lazuli: lazurite-rich rock, chiefly (Na,Ca)₈(AlSiO₄)₆(S,SO)₂; pale beads are uncertain
gemstone
Sandstone (with iron staining)
Quartz Arenite / Ferruginous Sandstone
sedimentary
Asphalt aggregate
Human-made bituminous asphalt containing crushed silicate rock aggregate
sedimentary
Chert (Black Flint)
Silicon Dioxide (SiO2)
sedimentary
Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Granite
Phaneritic Igneous Rock (primarily SiO2, Al2O3, K2O, Na2O)
igneous
Paving-concrete aggregate with a rounded stone
Polymictic gravel aggregate; the central clast appears to be weathered sandstone or volcanic rock
sedimentary
Sandstone
Sandstone (clastic sedimentary rock, predominantly SiO2)
sedimentary
Likely iron-rich rock or weathered metallic mineral fragment
Uncertain; possibly limonite/goethite or iron-bearing slag
mineral
Weathered chert or chalcedony nodule
Microcrystalline quartz (SiO₂), possibly silicified limestone or agate-like chalcedony
sedimentary
Sandstone (Pebble)
Arenite
sedimentary