Rock

Quartzite (Yellow/Orange variety)

Quartzite (primarily SiO2)

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Pebble (likely Sandstone or Granitic Pebble)

Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)

Basalt

Mafic Igneous Rock (composed primarily of plagioclase feldspar and pyroxene)

Basalt

Basalt (Mafic volcanic rock)

Basalt Cobble

Aphanitic Mafic Igneous Rock (Basalt)

Druzy Quartz on Chert/Siltstone

Silicon Dioxide (SiO2) on Microcrystalline Silica/Siltstone matrix

Sandstone (Weathered Cobble)

Clastic sedimentary rock (primarily SiO2)

Dyed Quartzite

Metamorphosed Quartz (SiO2) with synthetic pigment

Granite

Plutonic felsic rock (Quartz, Feldspar, Mica)

Basalt

Extrusive mafic igneous rock

Slate

Foliated Metamorphic Rock (Mainly composed of Quartz, Illite, Chlorite)

Unidentified Rock Fragment

Unknown

Herkimer Diamond

Quartz (Silica - SiO2)

Basalt

Basalt (composition predominately Plagioclase feldspar and Pyroxene)

Quartz Vein in Host Rock

Hydrothermal Quartz (SiO2) in Slates/Schists

Basalt

Basalt (Mafic Extrusive)

Vesicular Basalt with Quartz/Chalcedony

Vesicular Basalt (primarily Plagioclase, Pyroxene, and Olivine with SiO2 infill)

Sandstone (with potentially high Feldspar/Arkose content)

Clastic sedimentary rock (SiO2 dominated)

River Rocks (Black)

Various lithologies (e.g., basalt, chert, obsidian for black varieties), mechanically rounded clasts

Ironstone Concretion (Ironstone Gourd)

Limonite/Goethite Concretion (FeOO(H))

Quartz Vein in Gneiss or Basalt

Milky Quartz (SiO2) within Metamorphic Host Rock

Shale

Lutaceous sedimentary rock

Breciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Basalt

Vesicular Basalt

Shale or Slate with Quartz Veins

Shale (fine-grained clastic sedimentary rock) or Slate (low-grade metamorphic rock formed from shale) with Quartz (SiO2) veins

Sandstone (likely Greywacke or Lithic Sandstone)

Arenite / Wacke

Slickenside

Tectonic Fault Scarp Surface

Quartz Vein Rock

Quartz (Silicon Dioxide, SiO2)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

Serpentinite

Serpentinite (complex silicate minerals including lizardite, chrysotile, and antigorite: (Mg,Fe)3Si2O5(OH)4)

Pink Granite

Phaneritic Plutonic Igneous Rock (high K-feldspar)

Red Sandstone

Sandstone (principally Quartz with Iron Oxide coating)

Basalt with Vesicles

Vesicular Basalt (comprising Plagioclase Feldspar, Pyroxene, and Olivine)

Mica Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Quartz Veined Basalt

Mafic Volcanic Rock with Microcrystalline Quartz (SiO2)

Sandstone

Arenite (primarily SiO2)

Fish Fossil in Limestone

Lycoptera (likely) in Micritic Limestone

Yellow Chert or Jasper

Microcrystalline Quartz (SiO2)

River Pebble (Quartz/Jasper)

Silicon Dioxide (SiO2)