Organic Material (Likely A Fruit Or Berry)

Sandstone with Trace Fossils

Quartz Arenite with Bioturbation (Trace Fossils)

Weathered sandstone or limestone fragment

Likely quartz-rich sandstone or micritic limestone; exact identification requires testing

Quartz

Silicon Dioxide (SiO2)

Chert (often called Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fossiliferous Limestone

Carbonate sedimentary rock (CaCO3) with bioclasts

Polished rhyolite (likely porphyritic rhyolite)

Rhyolite, composed chiefly of quartz and alkali feldspar with minor plagioclase, biotite, and iron oxides

Sandstone

Arenite (primarily SiO2)

Black jade or dark serpentine cabochon

Jadeite (NaAlSi₂O₆) or nephrite amphibole; possibly serpentine (Mg₃Si₂O₅(OH)₄)

Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

Chert (Jasper variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Flint)

Chert (SiO2)

Orbicular granite (likely larvikite/rapakivi-type granite)

Granite; chiefly quartz, alkali feldspar, plagioclase, with dark biotite/amphibole and iron-oxide veining

Chert (Flinty variety)

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chalcedony (Agate/Carnelian variant)

Silicon Dioxide (SiO2)

Calligraphy Stone

Mariam Jasper (Fossiliferous Limestone with Hematite and Iron)

Milky quartz

Quartz, silicon dioxide (SiO₂)

Chert with Calcite Veining

Microcrystalline Quartz (SiO2) with Calcium Carbonate (CaCO3) veins

Small tumbled dark stone, possibly basalt or slag

Likely fine-grained basalt; exact identification is uncertain from the photograph

Chert (Red Jasper variant)

Microcrystalline Quartz (SiO2)

Colorless faceted gemstone, likely cubic zirconia

Cubic zirconia (zirconium dioxide, ZrO₂); visual confirmation is unavailable

Likely weathered mica schist fragment

Mica schist, chiefly muscovite/biotite mica with quartz and feldspar

Chert (Jasper variation)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified wood (primarily SiO2)

Petrified Wood

Silicified Wood (SiO2)

Chert (specifically Jasper or Flint variant)

Silicon Dioxide (SiO2)

Chert (Flint variety)

Silicon Dioxide (SiO2)

Chert (River Pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Jasper

Silicon dioxide (SiO2)

Tumbled blue-dyed stone, likely basalt or blue aventurine

Likely fine-grained basalt (plagioclase and pyroxene), possibly coated or dyed; exact identification requires testing

Chert Nodule (Flint)

Cryptocrystalline quartz (SiO2)

Weathered River Rock (likely Chert or Basalt with algae)

Silicon dioxide (SiO2) with organic biofilm

Sandstone (likely Siltstone or fine-grained Sandstone)

Sedimentary Rock (Clastic)

Petrified Wood

Silicified Wood (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Quartz Veined Basalt

Mafic Igneous Rock with Quartz (SiO2) intrusion

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Shale or Argillite

Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)

Chert (Yellow Jasper)

Microcrystalline Quartz (SiO2)

Chert (Holey Stone)

Microcrystalline Quartz (SiO2)

Chert (White Variety)

Microcrystalline Silica (SiO2)