Fossilized Shark Tooth (Fragment)
Elasmobranchii gen. et sp. indet. (Calcium Phosphate / Apatite fossil)
fossil
Category
Not A Natural Rock (Man Made Composite)
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Fossiliferous Limestone
Calcareous biomicrite / Bioclastic limestone
sedimentary
Diorite (River Pebble)
Intermediate plutonic igneous rock
igneous
Rough Emerald in Matrix
Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium
mineral
Chert (varietal Chalcedony or Flint)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Sandstone (Quartzose)
Arenite (SiO2 principal composition)
sedimentary
Sandstone (Pebble)
Sandstone
sedimentary
Granite Pebble
Granite (Phaneritic Igneous Rock)
igneous
Sandstone (Beach Pebble)
Clastic sedimentary rock (primarily Quartz and Feldspar)
sedimentary
Sandstone Pebble
Arenite (primarily SiO2)
sedimentary
Basalt Pebble
Extrusive Igneous Rock
igneous
Granite Pebble
Intrusive Igneous Rock
igneous
Witch Stone (Hag Stone)
Perforated Sedimentary Rock (Typically Sandstone or Limestone)
sedimentary
Industrial Slag
Anthropogenic Vitreous Slag
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Pumice and Scoria
Vesicular Volcanic Rock (Pumice: Silicic / Scoria: Mafic)
igneous
Shale
Argillaceous sedimentary rock
sedimentary
Granite
Phaneritic Felsic Igneous Rock (composed of quartz, feldspar, and mica)
igneous
Chert (Flint)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Chert with Limestone
Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3) Matrix
sedimentary
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Sandstone (composed predominantly of Quartz, SiO2)
sedimentary
Emerald in Matrix
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Blue Onyx (Dyed Agate/Chalky Chalcedony)
Silicon Dioxide (SiO2) with artificial pigment
mineral
Agate (Carnelian type)
Silicon Dioxide (SiO2)
mineral
Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Granite
Granite (interlocking crystals of quartz, feldspar, and mica)
igneous
River Pebble (Grey Quartzite / Sandstone Gravel)
Quartz-rich Sedimentary / Metamorphic River Pebble
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Beach Agate / Jasper Pebble
Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz pebble in concrete
Quartz (SiO₂), embedded in Portland-cement concrete
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Ironstone Nodule
Ferruginous Sandstone / Limonite Concretion
sedimentary
Generic Rock / Pebble
Undetermined rock specimen
sedimentary
Fossiliferous Limestone with Crinoid Stem
Sedimentary Rock with Echinodermata fossil fragment
fossil
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Rounded beach pebble
Lithology indeterminate; likely fine-grained sandstone, mudstone, or weathered volcanic rock
sedimentary