Rock (Likely Sedimentary)

Gneiss (Metamorphic Cobble)

Gneiss (High-grade Regional Metamorphic Rock)

Sandstone (likely Quartzose Sandstone with mineral staining)

Arenite (composed mainly of SiO2)

Gneiss (with Mica and Quartz)

Gneissic Metamorphic Rock

Gneiss (specifically a Granitic Gneiss)

Gneiss (typically composed of Quartz, Feldspar, and Mica/Amphiboles)

Sandstone (likely with Quartz Veining)

Arenite (primarily SiO2)

Sandstone (likely Quartzose Sandstone pebble)

Arenite (primarily SiO2)

Brachiopod Fossil in Limestone

Phylum Brachiopoda (likely Order Spiriferida), CaCO3 (Calcite)

Chert (Honey Chert or Chalcedony Pebble)

Cryptocrystalline Quartz (SiO2)

Jasper / Chert (River Pebble)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (or Flint)

Chert (Sedimentary Cryptocrystalline Sio2)

Chert (Grey-Green Var.)

Silicon Dioxide (SiO2)

Siltstone with Quartz Vein

Siltstone (primarily SiO2, Al2O3, Fe2O3)

Petrified Wood

Silicified Wood (SiO2)

Sandstone (likely Iron-rich or Arkosic)

Arenite (SiO2 with FeO(OH) or Fe2O3 staining)

N/A (Non-Geological Specimen)

Fossil Sand Dollar (Echinoidea)

Phylum Echinodermata, Class Echinoidea (likely Dendraster or Scutella)

Ferruginous Sandstone with Quartz Inclusions

Clastic Sedimentary Rock (Iron-rich Sandstone)

Green Jasper (with Quartz veining)

Jasper (Silica-rich microcrystalline variety of Quartz), formula: SiO2

Sandstone (likely Arkosic or Lithic)

Clastic Sedimentary Rock (SiO2 with accessory minerals)

Gneiss (with Quartz-Feldspar vein)

Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)

Sandstone, Quartzite, and River Pebbles

Silicon Dioxide (SiO2) based Sedimentary/Metamorphic structures

Sandstone (likely Ferruginous)

Arenite (SiO2 with iron oxide impurities)

Gneiss (specifically Pink Gneiss)

Gneiss (high-grade regional metamorphic rock)

Petrified Wood

Silicified Wood (primarily SiO2)

Jasper (likely Brecciated or Multi-colored)

Jasper (SiO2)

Sandstone with Ironstone Banding

Clastic Sandstone (composed of Quartz with Hematite/Limonite bonding)

Sandstone (likely Graywacke or Lithic Sandstone)

Arenite / Wacke (SiO2 based with lithic fragments)

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Sandstone (likely Arkose or Quartz Sandstone)

Arenite (SiO2 principal component)

Sandstone (likely Graywacke or Arkose variant)

Clastic Sedimentary Rock (SiO2 with assorted lithic fragments)

Sandstone (likely Red/Brown Sandstone)

Arenite (SiO2 based)

River Stone (likely Siltstone or fine-grained Sandstone)

Clastic Sedimentary Rock (Lithic Wacke / Siltstone)

Sandstone (likely Arkosic or Quartzose)

Sandstone (SiO2 with inclusions)

Quartz Pebble (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Sandstone (likely Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Wishing Stone (Basalt/Greywacke with Quartz Vein)

Basalt or Siltstone with SiO2 (Quartz) hydrothermal intrusion

Jasper

Silicon dioxide (SiO2)

Banded Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (SiO2 with Iron Oxide impurities)

Granite (Dioritic or Hornblende-rich)

Phaneritic Plutonic Felsic to Intermediate Igneous Rock

Iron-Stained Quartzite

Recrystallized Meta-Quartzite (primarily SiO2)

Fossiliferous Limestone (Crinoidal Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Quartz (likely Herkimer Diamond style)

Silicon Dioxide (SiO2)