Red Agate Sphere
Chalcedony (SiO2 with iron oxide inclusions)
sedimentary
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Dzi Bead Necklace (Agate/Carnelian)
Chalcedony (cryptocrystalline Quartz), SiO2
gemstone
Pink Granite
Phaneritic Felsic Igneous Rock
igneous
Sandstone (Quartzose Sandstone)
Arenite
sedimentary
Sandstone
Arenite (SiO2 with various cementing agents)
sedimentary
Granite
Intrusive Felsic Igneous Rock
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Granite
Phaneritic intrusive igneous rock
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Granite
Granite (Felsic Plutonic Rock)
Igneous
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Granite
Granite (Phaneritic Igneous Rock)
igneous
River Pebble (Gneiss or Quartzite mixture)
Metamorphic rock (Commonly Gneissic)
metamorphic
Chert
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Likely tumbled quartz-rich pebble
Quartz (SiO₂), possibly a weathered quartzite or chalcedony pebble
mineral
Hag Stone
Perforated sedimentary rock (typically limestone, sandstone, or flint)
sedimentary
Shale
Shale (clay-rich mudstone)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
River Pebble (Granite/Gneiss)
Granitic Pebble (Quartz, Feldspar, Mica composition)
igneous
Ventifact
Wind-abraded rock (Ventifact)
sedimentary
Shale
Argillite / Shaly Mudstone
sedimentary
Vesicular Basalt
Basalt
igneous
River Pebble (likely Quartzite or Chert)
Silicon Dioxide (SiO2)
metamorphic or sedimentary
Sandstone (Grooved/Weathered)
Arenite (composed primarily of Quartz and Lithic fragments)
sedimentary
Clear Quartz Crystal (Rock Crystal)
Quartz (Silicon Dioxide, SiO2)
mineral
Pyrite Nodule
Iron Sulfide (FeS2)
mineral
Pink Granite
Intrusive Felsic Igneous Rock
igneous
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Chert (Nodule/Pebble)
Chert (Silicon Dioxide, SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Chert (Banded)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (likely Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Emerald In Matrix
Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium
mineral
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Sandstone Pebble / Quartzite Pebble
SiO2 (Silicon Dioxide enriched sedimentary rock)
sedimentary
Sandstone with Iron Staining
Arenite with Limonite/Hematite inclusions (SiO2 + Fe2O3/FeO(OH))
sedimentary
Granite
Granite (Felsic Plutonic Rock)
Igneous
Granite
Granite (Phaneritic igneous rock)
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Sandstone (Quartz-rich)
Arenite (SiO2 based)
sedimentary
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
River Cobble (Quartzite / Granitic Gneiss)
Metamorphic Quartzite / Granitic Gneiss
metamorphic