Serpentinite
Serpentinite (complex silicate minerals including lizardite, chrysotile, and antigorite: (Mg,Fe)3Si2O5(OH)4)
metamorphic
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Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Pink Granite
Phaneritic Plutonic Igneous Rock (high K-feldspar)
igneous
Basalt
Vesicular Basalt
igneous
Red Sandstone
Sandstone (principally Quartz with Iron Oxide coating)
sedimentary
Granitic Pebble (Glacial Erratic)
Granite
igneous
Basalt with Vesicles
Vesicular Basalt (comprising Plagioclase Feldspar, Pyroxene, and Olivine)
igneous
Ironstone Concretion (Ironstone Gourd)
Limonite/Goethite Concretion (FeOO(H))
sedimentary
Gneiss (Metamorphic Pebble)
Gneissic Metamorphic Rock
metamorphic
Weathered quartz-rich rock, possibly granite or quartzite
Indeterminate; likely quartz–feldspar aggregate, possibly altered granite
igneous
Granite
Granite
Igneous
Plume Agate or Moss Agate
Agate (SiO2)
mineral
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Druzy Quartz on Chert/Siltstone
Silicon Dioxide (SiO2) on Microcrystalline Silica/Siltstone matrix
sedimentary
Sandstone
Arenite
sedimentary
Druzy Quartz Geode
Silicon Dioxide (SiO2)
mineral
Banded Gneiss / Veined Metamorphic Pebble
Metamorphic Rock with Quartz/Feldspar Veins
metamorphic
Basalt with Quartz Vein
Extrusive Igneous Rock / Volcanic Rock
igneous
Pink-and-black granite
Biotite-bearing granite, chiefly quartz, feldspar, and biotite mica
igneous
Weathered limestone
Calcite-rich limestone (CaCO₃), possibly fossiliferous or dolomitic
sedimentary
Orbicular granite (likely rapakivi-type granite)
Granite; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende
igneous
Slickenside
Tectonic Fault Scarp Surface
metamorphic
River Rocks (Black)
Various lithologies (e.g., basalt, chert, obsidian for black varieties), mechanically rounded clasts
Sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Shale
Lutaceous sedimentary rock
sedimentary
Weathered garnet-bearing gneiss
Quartz–feldspar–mica gneiss with almandine garnet, chiefly Fe₃Al₂(SiO₄)₃
metamorphic
Gneiss Pebble
Gneiss
metamorphic
Vesicular Basalt with Quartz/Chalcedony
Vesicular Basalt (primarily Plagioclase, Pyroxene, and Olivine with SiO2 infill)
igneous
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Vesicular Basalt (Lava Rock)
Basalt (Vesicular Variety)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz vein in weathered host rock
Quartz (SiO₂), likely in a weathered metamorphic or igneous matrix
mineral
Brachiopod Fossil
Phylum Brachiopoda
fossil
Granite
Felsic intrusive igneous rock
igneous
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone with Iron Banding
Arenite with Hematite or Limonite staining (SiO2 with Fe2O3)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz Vein in Gneiss or Basalt
Milky Quartz (SiO2) within Metamorphic Host Rock
Metamorphic or Igneous with Mineral Inclusion
Quartz Vein in Host Rock
Hydrothermal Quartz (SiO2) in Slates/Schists
metamorphic