Rock (Likely Sedimentary)

Limestone with Chert or Siltstone bands

Sedimentary carbonate rock (CaCO3) often with siliceous impurities

Petrified Wood

Silicified Wood (SiO2)

Jasper with Hematite inclusions

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)

Sandstone (likely Quartzose Sandstone)

Arenite (SiO2 predominantly)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chalcedony (Botryoidal/Agate nodule)

Microcrystalline Quartz (SiO2)

Chert (specifically Agate/Jasper variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

River Pebble (Likely Chert or Fine-Grained Sandstone/Quartzite)

Siliciclastic clast (likely Chert or Quartzarenite/Quartzite pebble)

Sandstone (likely Quartzose Sandstone)

Arenite (primarily SiO2)

Sandstone (likely Quartzose)

Arenite (SiO2 principal mineral)

Sandstone (likely Arkosic or Lithic Sandstone)

Arenite (SiO2 based with mineral inclusions)

Sandstone (Micaceous/Feldspathic variant)

Arenite (specifically subarkose or lithic arenite)

Sandstone

Arenite (composed primarily of SiO2)

Agate (Chalcedony)

Cryptocrystalline Silica or Silicon Dioxide (SiO2)

Chalcedony Nodule (Commonly known as Agate or Chert)

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Schist

Mica Schist

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Sandstone (Stream-rounded Cobble)

Arenite (composed primarily of SiO2, Silica)

Sandstone (likely Quartzose Sandstone)

Arenite (composed primarily of SiO2)

Coal (likely Bituminous or Lignite)

Organic Sedimentary Rock (Carbonaceous)

Fossiliferous Limestone with Rugose Coral

Calcite (CaCO3) matrix containing Rugosa (order of extinct solitary and colonial corals)

Sandstone (likely Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

Chert (specifically a weathered Chert nodule or fragment)

Chert; Microcrystalline or Cryptocrystalline Quartz (SiO2)

Jasper with Quartz Druzy

Silicon Dioxide (SiO2)

Sandstone (likely Arkose or Quartz Sandstone)

Arenite (SiO2 + varied clasts)

Sandstone (likely Quartzose Sandstone)

Arenite (SiO2 principal composition)

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Chert (Yellow or Ochre Jasper variant)

Microcrystalline Quartz (SiO2)

Sandstone (likely a river or beach pebble)

Sandstone (a clastic sedimentary rock)

Coal (most likely Bituminous or Anthracite)

Coal (organic sedimentary rock)

Banded Gneiss

Gneiss (Metamorphic Rock)

Greenstone / Diabase Porphyry

Porphyritic Diabase (Micro-gabbro)

Sandstone Concretion with Quartz Center

Sedimentary Clastic Rock (SiO2 matrix with Quartz core)

Sandstone (Ferruginous/Red Sandstone)

Clastic sedimentary rock (primarily SiO2 with Fe2O3)

Sandstone

Arenite (primarily SiO2)

Sandstone (likely Quartz Sandstone)

Arenite (SiO2 based)

Sandstone (likely Graywacke or Arkosic varieties)

Arenite (composed primarily of SiO2)

Marble

Recrystallized Calcite Rock (CaCO3)

Sandstone Pebble with Iron Staining

Clastic Sedimentary Rock (primarily Quartz with Fe2O3 oxides)

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Sandstone Beach Pebble

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide coating)