Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Category
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Basalt
Mafic Igneous Rock (composed primarily of pyroxene and calcium-rich plagioclase)
igneous
Sandstone (with potentially high Feldspar/Arkose content)
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Vesicular Basalt (Lava Rock)
Basalt (Vesicular Variety)
igneous
Plume Agate or Moss Agate
Agate (SiO2)
mineral
Basalt
Vesicular Basalt
igneous
Shale
Lutaceous sedimentary rock
sedimentary
Ironstone Concretion (Ironstone Gourd)
Limonite/Goethite Concretion (FeOO(H))
sedimentary
Gneiss (Metamorphic Pebble)
Gneissic Metamorphic Rock
metamorphic
Quartzite with Hematite staining
Quartzite (SiO2) with iron oxide inclusions
metamorphic
Quartzite (River Pebble)
Meta-quartzite (composed primarily of SiO2)
metamorphic
Sandstone
Arenite
sedimentary
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
Metamorphic, likely Sedimentary with Quartz veins
Basalt
Extrusive mafic igneous rock
igneous
Breciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Druzy Quartz Geode
Silicon Dioxide (SiO2)
mineral
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Quartz Vein Rock
Quartz (Silicon Dioxide, SiO2)
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Serpentinite
Serpentinite (complex silicate minerals including lizardite, chrysotile, and antigorite: (Mg,Fe)3Si2O5(OH)4)
metamorphic
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
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
Sandstone (likely Greywacke or Lithic Sandstone)
Arenite / Wacke
sedimentary
Quartz Veined Basalt
Mafic Volcanic Rock with Microcrystalline Quartz (SiO2)
igneous
Granite
Granite
Igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Vesicular Basalt (Scoria)
Aphanitic Mafic Igneous Rock (Vesicular Basalt)
igneous
Yellow Chert or Jasper
Microcrystalline Quartz (SiO2)
sedimentary
River Pebble (Quartz/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Fossiliferous Chert with Brachiopod Impression
Chert (SiO2) containing Brachiopoda fossil remains
sedimentary
Gold (Elemental Metal)
Gold (Au)
Mineral
Unakite
Epidotized Granite
metamorphic
Sandstone with Iron Banding
Arenite with Hematite or Limonite staining (SiO2 with Fe2O3)
sedimentary
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral