Rock (Likely Sedimentary)

Weathered iron-rich sandstone or ironstone cobble

Ferruginous sandstone/ironstone, chiefly quartz (SiO₂) cemented or stained by iron oxides and hydroxides

Sandstone (likely Quartzose)

Clastic sedimentary rock (SiO2 primary)

Sandstone with Trace Fossils

Arenite / Quartzwacke with Ichnofossils

Conglomerate

Clastic sedimentary rock (Conglomerate)

Sandstone with Secondary Mineral Encrustation

Arenite with Silica/Calcite deposits (SiO2 or CaCO3)

Granite Gneiss with Garnet

Garnetiferous Gneiss

Chalcedony (Agate/Carnelian precursor)

Chalcedony (Silicon Dioxide, SiO2)

Weathered, quartz-rich metamorphic rock (likely schist or gneiss)

Quartz–feldspar–mica schist/gneiss, with surface lichens and iron-oxide staining

Limestone with Calcite Crust

Sedimentary Calcium Carbonate (CaCO3)

Sandstone (likely Quartzose)

Arenite (primarily SiO2)

Gravelly, weathered sediment (likely glacial till)

Unconsolidated diamicton; mixed lithologies, commonly including quartz, feldspar, and weathered silicate rock fragments

Chert (Yellow Jasper/Flint)

Silicon Dioxide (SiO2)

River Pebble (likely Quartzite or Siltstone)

Sedimentary Clast (SiO2 based)

Sandstone (Flagstone)

Arenite (composed primarily of SiO2)

Sandstone (River Pebble)

Clastic Sedimentary Rock (primarily Quartzite/Arenite)

Quartz Veined Siltstone

Siltstone with Quartz Intrusion (SiO2)

Weathered limestone

Calcite-rich limestone (CaCO₃), possibly fossiliferous or dolomitic

Weathered brown rock, likely iron-stained sandstone or chert

Indeterminate; probable quartz-rich sandstone/chert with iron-oxide staining

River Pebble (likely Quartzite or Chert)

Sedimentary Clast (Silicon Dioxide dominant)

Sandstone (Quartzite-rich Pebble)

Arenite (composed primarily of SiO2)

Chert (Jasper-bearing)

Chert (Silicon Dioxide, SiO2)

Quartz with inclusions (likely Chlorite or Hornblende) and country rock

SiO2 (Quartz) with associated ferromagnesian minerals

Rounded granite or granitic gneiss cobble

Granite; primarily quartz, feldspar, and mica (exact identification requires a fresh surface and testing)

Weathered volcanic rock, likely vesicular basalt or scoria

Basaltic volcanic rock; predominantly plagioclase, pyroxene, and possibly olivine with iron-oxide weathering

Basalt and Quartz Pebble

Basalt (Igneous) and Quartzite/Quartz (SiO2) pebble

Fossiliferous Limestone with Crinoid stems

Calcite-rich Biogenic Sedimentary Rock (CaCO3)

Limestone (likely weathered)

Limestone (Mainly Calcium Carbonate, CaCO3)

River Cobble (Quartzite-rich Sandstone)

Clastic Sedimentary Rock (Litharenite/Quartzite transition)

Sandstone (Quartzite Pebble)

Arenite / Metamorphosed Sandstone (SiO2)

Brown Pebble (River Rock)

Indeterminate (Likely Silicon Dioxide / Quartz-rich)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3)

Chert (Nodule/Pebble)

Chert (Silicon Dioxide, SiO2)

Black Limestone with Calcite Veins

Limestone (Calcium Carbonate, CaCO3)

Feldspathic Gneiss

High-grade Metamorphic Rock (Gneiss)

Mixed rock and mineral specimen collection

Multiple species, likely quartz (SiO₂), calcite (CaCO₃), feldspar, chert, and assorted volcanic/sedimentary rocks

Ironstone (likely siderite or goethite-rich siltstone)

Ferruginous Siltstone

Sandstone (Quartz-rich)

Arenite (composed primarily of SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone (likely Graywacke or Arkose)

Arenite

Pyrite in Matrix (Quartz/Schist)

Iron Sulfide (FeS2)

Quartz Vein in Host Rock (clastic sediment)

Silicon Dioxide (SiO2) in matrix

Sandstone (likely Arkose or Quartz Sandstone)

Clastic sedimentary rock (primarily SiO2)