Vesicular Basalt
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Category
Industrial Byproduct (Anthropogenic Rock)
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Pumice
Pumice (a highly vesicular volcanic glass)
igneous
Quartz vein in metamorphic rock
Crystalline Silicon Dioxide (SiO2) in Host Rock
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Red Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Dyed Agate Slice
Silicon Dioxide (SiO2) with artificial colorants
Mineral (variety of Chalcedony)
Basalt
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Basalt (Vesicular/Scoria)
Vesicular Basalt
igneous
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Serpentine
Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Fe)2O5(OH)4)
metamorphic
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
sedimentary
Serpentine / Antigorite
Mg3Si2O5(OH)4 (Serpentine Group)
metamorphic
Schist
Schist (Crystalline metamorphic rock)
metamorphic
Basalt Pebble
Basalt (Mafic volcanic rock)
igneous
Basalt
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Barite Rose
Barium Sulfate (BaSO4)
mineral
Ironstone (Limonitic Shale)
Ferruginous Siltstone / Goethite-rich Sedimentary Rock
sedimentary
Schist
Crystalline Metamorphic Rock (Schistose)
metamorphic
Clay Brick
Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)
metamorphic (man-made/anthropogenic)
Kimberlite with Diamonds
Kimberlite (ultramafic potassic igneous rock)
igneous
Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxides
sedimentary
Muscovite Mica Schist
Metamorphic Rock (Muscovite-Biotite Schist)
metamorphic
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Basalt with Quartz/Calcite Veins
Aphanitic Mafic Igneous Rock (Hydrothermal Veined)
igneous
Sandstone
Arenite (SiO2 primarily)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Crushed Stone (Gravel/Aggregates)
Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)
sedimentary and igneous (mixed)
Quartz Vein in Metamorphic Rock
Silicon Dioxide (SiO2) within Metasedimentary host
metamorphic
Basalt
Basalt
igneous
Granite Pegmatite
Coarse-grained Granite (SiO2 - Aluminum and Alkalies)
igneous
Moss-covered Rock Fragment
Weathered Rock Fragment with Epilithic Growth
sedimentary
Limestone
Sedimentary Rock (Primarily CaCO3)
sedimentary
Sea Glass
Amorphous Silica (SiO2) with various additives
Mineraloid (Anthropogenic)
Note: Item is not a geological specimen
Guitar Components (Steel, Nickel, Plastic, Wood)
Synthetic/Consumer Product
Silicon Carbide (Carborundum)
Silicon Carbide (SiC)
mineral
Note: Item is not a geological specimen
Homo sapiens (Dermal Appendage: Pilus)
Organic / Biological