Rock

Vesicular Basalt (Scoria)

Vesicular Basalt

Manhattan Schist

Manhattan Schist (Aluminous Metasedimentary Rock)

Decorative polished pebbles

Likely mixed quartz-rich lithologies, including quartzite, jasper, and/or basalt

Quartz-veined Sandstone Pebble

Quartzite-veined Arenite

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz with Limonite/Goethite staining)

Unakite

Epidotized Granite

Shale

Shale (Lutite)

Tiger Iron

Tiger Iron (Composition: SiO2, Fe2O3, Fe3O4)

Pink Quartzite

Quartzite (SiO2 with minor iron oxide impurities)

Shale

Fissile mudrock (composed primarily of clay minerals and quartz)

Vesicular Basalt (or Scoria)

Vesicular Basalt (Aphanitic-vesicular volcanic rock)

Mixed rock collection

Labeled specimens appear to include iron-rich rock, schist, basalt, serpentinite, and shale

Layered sandstone

Quartz-rich sandstone, likely arkosic or lithic sandstone

Weathered granitic rock

Granite, likely quartz–feldspar–mica aggregate

Weathered quartz-rich pebble, possibly granite or pegmatite

Quartz (SiO₂) with probable feldspar and minor mica/iron-oxide inclusions

Peridotite

Ultramafic intrusive igneous rock

Quartz Pebble (with Iron Staining)

Crystalline Silicon Dioxide (SiO2)

Schist

Schist (metamorphic rock)

Pahoehoe Basalt

Extrusive mafic volcanic rock

Eroded volcanic rock formation (likely basalt)

Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, with possible olivine

Sandstone and Conglomerate pebbles

Sedimentary clastic rock

Mixed Rock Collection

Polylithic Geological Specimen Mix

Tumbled serpentine or serpentinite

Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; approximate formula Mg₃Si₂O₅(OH)₄

Quartz Geode

Silicon Dioxide (SiO2) within a sedimentary or igneous host

Quartz Geode

Silicon Dioxide (SiO2)

Basalt with Amygdales

Amygdaloidal Basalt

Tumbled green stone, likely serpentine

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile)

Serpentine (polished/tumbled)

Serpentine-group minerals, chiefly antigorite, Mg₃Si₂O₅(OH)₄

Rounded basalt pebble

Fine-grained mafic volcanic rock, commonly basalt (plagioclase + pyroxene ± olivine)

Basalt

Mafic extrusive igneous rock

Basalt with Quartz Veining

Veined Basalt (composed primarily of plagioclase feldspar, pyroxene, and olivine with quartz/calcite infill)

Basalt with Quartz/Calcite Veins

Amygdaloidal Basalt (SiO2 or CaCO3 inclusions)

Quartzite River Pebble

Quartzite (primarily Silicon Dioxide, SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Porphyritic Basalt (Drill Core)

Porphyritic Basalt with Plagioclase Phenocrysts

Ferruginous Sandstone (Ironstone)

Sandstone with Hematite/Goethite cement (SiO2 + FeO(OH))

Schist

Mica Schist (contains muscovite/biotite and quartz)

Quartz–iron-oxide breccia or weathered quartz-bearing rock

Quartz (SiO₂) with limonite/goethite and possibly iron sulfides in a brecciated host

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)