Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Category
Not A Geological Specimen
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Chert Pebble
Chert (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Slag (Industrial Byproduct)
Ferrous/Non-ferrous Silicate
igneous (artificial/anthropogenic)
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (Sedimentary Rock)
sedimentary
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz with Inclusions
Silicon Dioxide (SiO2)
mineral
Amethyst (Rough Quartz)
Silicon Dioxide (SiO2 with Iron impurities)
mineral
Quartz Vein in Host Rock
Quartz (SiO2) in Mafic or Sedimentary Matrix
igneous
Chert Nodules in Limestone
Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Granitic Gneiss
Felsic Polycrystalline Gneiss
metamorphic
General river rock or weathered cobble
Mixed rock composition
igneous/metamorphic
Dalmatian Stone (commonly Dyed)
Dalmatian Jasper (Peralkaline igneous rock)
igneous
Greenstone / Basalt
Aphanitic Mafic Igneous Rock (likely altered Basalt)
igneous
Anthracite Coal
Anthracite (a variety of coal, predominantly carbon)
Sedimentary Rock (Metamorphosed)
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (Siliclastic Sedimentary Rock)
sedimentary
Yellow Chalcedony (Agate/Chert)
Cryptocrystalline Quartz (SiO2)
mineral
Goethite pseudomorph after Pyrite
Goethite (FeO(OH)) pseudomorph after Pyrite (FeS2)
mineral
Granite Pebble
Granite; primarily composed of Quartz (SiO2), Feldspar (KAlSi3O8), and Mica
igneous
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Fossil Shark Tooth (Cretaceous white shark type)
Squalicorax (commonly known as Crow Shark)
Organic specimen (fossil)
Quartz (Variety: Citrine or Tumbled Chalcedony)
Silicon Dioxide (SiO2)
mineral
Calcite in Matrix
Calcium Carbonate (CaCO3)
mineral
Quartz Pebble (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
sedimentary
Fossilized Gastropod (Snail)
Class Gastropoda (internal mold or 'steinkern')
sedimentary
Conglomerate
Conglomerate (Clastic sedimentary rock)
sedimentary
Fossiliferous Limestone (Crinoidal Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Greenschist (Greenstone River Pebble)
Greenschist (Chlorite Schist)
metamorphic
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Sandstone with Desert Varnish
Arenite with Ferromanganese patina
sedimentary
Chert (Mookaite style Jasper)
Microcrystalline Quartz (SiO2) with Hematite/Goethite inclusions
sedimentary
White Salt Crystal Lamp (Halite)
Halite (Sodium Chloride, NaCl)
mineral
Fossil Bivalve Shell
Class Bivalvia (e.g., Veneriidae family)
sedimentary
Chert Concretion
Silicon dioxide (SiO2)
sedimentary
Brachiopod Fossil
Phylum Brachiopoda (likely Order Rhynchonellida or Spiriferida)
sedimentary
Gold-bearing Quartz (Auriferous Quartz)
Quartz (SiO2) with native Gold (Au) inclusions
mineral
Sandstone (likely Fossiliferous)
Arenite / Sedimentum arenaceum
sedimentary