Rock

Vesicular Basalt (or Scoria)

Vesicular Basalt (Aphanitic-vesicular volcanic rock)

Shale

Fissile mudrock (composed primarily of clay minerals and quartz)

Sandstone

Arenite

Shale

Argillaceous Rock

Quartz Pebble (with Iron Staining)

Crystalline Silicon Dioxide (SiO2)

Schist

Schist (metamorphic rock)

Pahoehoe Basalt

Extrusive mafic volcanic rock

Quartz Geode

Silicon Dioxide (SiO2)

River Pebble (likely Quartzite or Chert)

Sedimentary Clast (Silicon Dioxide dominant)

Orbicular Jasper (Ocean Jasper)

Silicon Dioxide (SiO2) with various inclusions

Sandstone Cobble

Clastic Sedimentary (Sandstone)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)

Pumice

Pumice (Vesicular Rhyolite/Andesite)

Chert / Chalcedony (likely carnelian or flint variety)

Silicon Dioxide (SiO2)

Quartz Vein in Sedimentary Matrix

Silicon Dioxide (SiO2) with host rock

Horn Coral Fossil

Rugosa (Tetracoralla)

Quartz Pebble (Geode Fragment / Druzy Cavity)

Silicon Dioxide (SiO2)

River Cobble (Basalt or Sandstone)

Weathered Basalt or Fine-Grained Sandstone

Milky Quartz with Country Rock contact

Silicon Dioxide (SiO2) in contact with Metamorphic/Igneous rock

Banded Rock (likely Quartz-rich)

Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals

Vesicular Basalt

Basalt with vesicular texture

Black Limestone with Calcite Veining

Bituminous Limestone (CaCO3 with Organic Carbon inclusions)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

White Topaz

Aluminum Silicate Fluoride Hydroxide; Al2SiO4(F,OH)2

Sandstone

Arenite (predominantly SiO2 quartz grains)

Garnet Schist

Almandine-Muscovite Schist

Schist

Mica Schist (Medium-grade Metamorphic Rock)

Gabbro or Diorite with Quartz/Epidote Vein

Intrusive Igneous Rock (Plutonic)

Quartz Geode

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2) in Geodic habit

Quartz Geode with Calcite

Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)

Yellow Quartzite

Quartzite (SiO2 with iron oxide inclusions)

Basalt

Extrusive mafic igneous rock

Granite

Granite (Felsic Plutonic Rock)

Peridotite (Pyroxenite/Serpentinized Dunite)

Ultramafic Rock (consisting primarily of Olivine and Pyroxene)

Puddingstone (Gowganda Tillite/Jasper Conglomerate)

Jasper Conglomerate (SiO2 primary composition)

Gneiss

High-grade metamorphic rock (Gneiss)

Basalt with Quartz/Calcite Veining

Basalt (principally Plagioclase and Pyroxene)

Greenstone / Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4

Sandstone (Iron-stained)

Arenite with Limonite/Hematite staining

Quartz Druzy (Geode Fragment)

Silicon Dioxide (SiO2)

Snakeskin Jasper

Microcrystalline Quartz (SiO2) with iron inclusions