Organic Material (Likely A Fruit Or Berry)

Iron meteorite (probable)

Fe–Ni metallic meteorite, possibly an ordinary chondrite or iron-rich meteorite

Quartz-rich rock with chlorite/epidote vein

Milky quartz with green chlorite or epidote; exact identification requires testing

Sandstone (with banding/weathering)

Clastic Sedimentary Rock (primarily SiO2)

Rhyolitic Tuff (Breccia Type)

Rhyolitic Pyroclastic Rock (Mixed Silicates including Quartz, Feldspar, and Volcanic Glass)

Sand Grain (Quartz)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (SiO2 / Quartz pseudomorph after wood)

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Tumbled dark river pebble, probably basalt

Fine-grained mafic volcanic rock, most likely basalt; exact identification requires testing

Sandstone

Arenite (primarily SiO2)

Quartz (specifically Milky/Gray Quartz vein)

Silicon Dioxide (SiO2)

Asphalt (Bituminous Concrete)

Composite material (bitumen binder with mineral aggregate)

Chert (Arrowhead/Tool variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Possible basaltic rock or meteorite candidate

Likely vesicular basalt; meteorite identification cannot be confirmed visually

Shale or Slaty Mudstone

Argillaceous sedimentary rock

Chert

Chert (Microcrystalline Quartz, SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Zebra Rock / Zebra Marble

Banded Limestone-Marble Transition

Likely polished bronzite or serpentine-rich rock

Probable bronzite, an iron-bearing orthopyroxene (Mg,Fe)SiO₃; exact identification requires testing

Ironstone Concretion (Limonite/Hematite Nodules)

Ironstone (principally Limonite FeO(OH)·nH2O or Hematite Fe2O3 mixed with silica/clay)

Likely fossilized shell or carbonate concretion

Indeterminate biogenic calcium carbonate, commonly calcite (CaCO₃)

Blue calcite (likely)

Calcite, CaCO₃

Quartz-rich metamorphic fragment (likely mica schist)

Mica schist, probably muscovite–quartz schist

Banded metamorphic rock, likely mica schist or gneiss

Quartz–feldspar–mica schist/gneiss; exact identification requires a fresh surface and mineral tests

Quartzite Pebble

Quartzite (primarily SiO2)

Granite-like igneous rock

Likely medium-grained granite or granodiorite; quartz–feldspar–mica aggregate

Quartz-rich translucent pebble, possibly iron-stained quartz or chalcedony

Quartz (SiO₂), potentially microcrystalline quartz (chalcedony)

Likely citrine or yellow glass imitation in a silver-tone bracelet

Citrine: quartz, SiO₂; exact material cannot be confirmed visually

Yellow jasper (likely ocean jasper or brecciated jasper)

Jasper, microcrystalline quartz (SiO₂) with iron-oxide staining and dark mineral veins

Biotite-bearing granite or granodiorite

Coarse-grained felsic intrusive rock; chiefly quartz, feldspar, and biotite mica

Rounded granite pebble

Granite; chiefly quartz, feldspar, and mica

Chert (Common Variety, Jasper)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Granite or granitic gneiss

Felsic granitoid, chiefly quartz, feldspar, and mica; possibly weakly foliated gneiss

Chert (Chocolate or Brown Flint)

Chert (SiO2)

Chalky limestone

Micritic calcite limestone; predominantly CaCO₃

Porphyritic rhyolite (likely lithophysal/vesicular rhyolite)

Rhyolite; chiefly quartz and alkali feldspar, with minor plagioclase and iron-bearing minerals

Tumbled zebra calcite (likely calcite marble)

Calcite, CaCO₃; commonly recrystallized limestone/marble with dark graphite- or carbon-rich bands

Chert (Flint Nodules)

Silicon Dioxide (SiO2)