Organic Material (Likely A Fruit Or Berry)

Pegmatitic granite

Coarse-grained granite, chiefly quartz, feldspar, and mica; likely a granitic pegmatite

Chert Arrowhead

Chert (Cryptocrystalline variety of Quartz, SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Ironstone / limonite-rich concretion

Hydrated iron oxides, chiefly limonite/goethite (FeO(OH)·nH₂O), possibly with hematite

Chert (River Pebble)

Silicon Dioxide (SiO2)

Iron-stained garnet-bearing rock, possibly almandine garnet

Garnet-group silicate, likely almandine (Fe₃Al₂Si₃O₁₂), in a quartz–iron-oxide matrix

Slate Pebble

Low-grade Metamorphosed Shale (Slate)

Rounded brown-gray stone, possibly weathered conglomerate or sandstone

Indeterminate clastic sedimentary rock; likely poorly cemented sandstone/conglomerate

Chert (often called Flint or Chalcedony Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint variety)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Jasper variant)

Silicon Dioxide (SiO2)

Tumbled brown stone, likely jasper or iron-stained quartz

Microcrystalline quartz (SiO₂), possibly chalcedony/jasper with iron-oxide inclusions

Chert (Flint)

Microcrystalline Quartz (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartzite River Rock

Quartzite (primarily SiO2)

Chert Nodule (Flint)

Chert (Silicon Dioxide, SiO2)

Granite with Epidote

Granite, containing quartz, feldspar, and epidote

Chert (Field Pebble)

Microcrystalline / Cryptocrystalline Quartz (SiO2)

Chert (often called Flint)

Microcrystalline Quartz (SiO2)

Vesicular basalt (possible scoria)

Basaltic volcanic rock; chiefly plagioclase, pyroxene, and iron-rich minerals, with vesicles formed by trapped gas

Chert (Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Jasper

Silicon Dioxide (Microcrystalline Quartz, SiO2)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Likely basalt

Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase, clinopyroxene, and often olivine

Banded Chert

Chert (Microcrystalline Quartz, SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2)

Sandstone (likely Quartzose)

Sandstone (Principally SiO2)

Sandstone (likely Arkosic)

Arenite (SiO2 with KAlSi3O8)

Rounded gray river pebble, likely fine-grained sandstone or siltstone

Indeterminate clastic sedimentary rock; possibly quartz-rich sandstone or siltstone

Granite pebble

Granite, chiefly quartz, feldspar, and mica

Rounded gray metamorphic cobble, likely quartzite or gneiss

Quartz-rich metamorphic rock; possibly quartzite (mostly SiO₂) or banded gneiss

Banded Chert (River Jasper)

Silicon Dioxide (SiO2) with impurities

Chert (variations include Flint or Jasper)

Silicon Dioxide (SiO2)

Chert (Septarian Nodules-like)

Silicon dioxide (SiO2)

Jasper-Agate

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert Nodule

Chert (Microcrystalline Silicon Dioxide, SiO2)

Yellow Jasper

Silicon Dioxide (SiO2)

Petrified Wood

Silicified wood (primarily Quartz/Chalcedony, SiO2)

Black Jasper

Black Jasper (Silicate mineral - SiO2)