Granite
Felsic intrusive igneous rock
igneous
Category
Industrial Byproduct (Anthropogenic Rock)
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Quartz (Clear/Smoky Geode fragment)
Silicon Dioxide (SiO2)
mineral
Vesicular Basalt (Scoria)
Basalt with vesicular texture
igneous
Red Sandstone
Arenite (Iron-rich)
sedimentary
Basalt
Extrusive igneous rock
igneous
Granite
Granite
igneous
Basalt with inclusion
Basalt (Aphanitic-Porphyritic texture)
igneous
Basalt with Scoria
Amygdaloidal Basalt / Vesicular Basalt
igneous
Druzy Quartz on Chert/Chalcedony
Silicon Dioxide (SiO2)
mineral
Fossil Coral
Rugose Coral or Tabulate Coral (Phylum Cnidaria)
fossil
Weathered granite or granitic gneiss
Granite: quartz, feldspar, and mica; possibly gneiss if the dark minerals are banded
igneous
Granite
Granite; primarily quartz (SiO₂), feldspar, and mica
igneous
Quartz-Veined Slate or Greenstone
Metamorphic rock with quartz vein (SiO2)
metamorphic
Aventurine (likely Green Aventurine)
Aventurine (a variety of quartz, SiO₂, with common inclusions of fuchsite)
Mineral/Metamorphic Rock
Diamond
Carbon (C)
gemstone
Bauxite
Bauxite (Al2O3·2H2O)
sedimentary
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Anthracite Coal
Anthracite
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Coquina
Bioclastic Limestone
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Almandine Garnet
Almandine - Fe3Al2(SiO4)3
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Geode (Quartz / Chalcedony Geode)
SiO2 (Silicon Dioxide)
sedimentary
Oak-grain Laminate (Industrial/Decorative Furniture Finish)
Melamine Resin-impregnated Decorative Paper on Particleboard (Cellulose/Thermosetting Plastic)
not a rock (synthetic material)
Geode with Quartz and possibly Jasper/Hematite
Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides
Mineral/Sedimentary Geode
Granite River Rock
Intrusive igneous rock (composed mainly of quartz, alkali feldspar, and plagioclase)
igneous
Granite / Quartzite Specimen
Granite / Quartz (SiO2 with Feldspar and Mica)
igneous
Basalt Pebble (Vesicular / Beach Cobble)
Basalt (mafic extrusive igneous rock)
igneous
Jasper
Silicon dioxide (SiO2)
mineral
Chert Pebble
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Yellow Quartzite (River Pebble)
Quartzite (SiO2)
metamorphic
Likely gneiss
Gneiss, composed chiefly of quartz, feldspar, and mica/amphibole
metamorphic
Amber-bearing Coal/Sedimentary Rock
Bituminous coal or carbonaceous siltstone with Fossilized Tree Resin (C10H16O)
sedimentary
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Diamond
Carbon (C)
mineral
Quartz (Milky or Cloudy variety)
Quartz (Silicon Dioxide, SiO2)
mineral
Red Jasper (Beach Pebble)
SiO2 (Microcrystalline Quartz with Hematite inclusions)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Tumbled serpentine with dark magnetite/chromite matrix
Serpentinite; chiefly antigorite/lizardite, Mg3Si2O5(OH)4, with magnetite and possibly chromite
metamorphic