Glacial Erratic (Graywacke/Sandstone)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Category
Anthropogenic (Man Made Material)
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Crushed Granite and Quartz Gravel
Composite Igneous and Silicate Rock Aggregate
igneous
Crushed Stone Ballast
Crushed Limestone or Granite Aggregate
sedimentary
Coal
Combustible sedimentary rock
sedimentary
Sand
Siliciclastic sediment / Quartz sand (SiO2)
sedimentary
Gravel and Sand Aggregate
Unconsolidated Clastic Sediment
sedimentary
Small rounded pebble
Indeterminate lithic grain; likely weathered sandstone, iron-stained quartz-rich rock, or a concretion
sedimentary
Fossilized Nut / Coprolite / Concretion
Trace Fossil / Permineralized Plant Material
fossil
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Jade (likely Nephrite Jade based on appearance)
Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)
Mineral
Titanium Aura Quartz
Titanium-coated Silicon Dioxide (SiO2)
mineral (man-enhanced)
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Serpentinite
Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)
Metamorphic Rock
Iron Meteorite / Chondrite (Possible)
Extraterrestrial stony-iron or chondritic meteorite
meteorite
Chert Pebble
Cryptocrystalline Quartz (SiO2)
sedimentary
Diamond
C
gemstone
Diamond (or Diamond Simulant)
Carbon (C)
gemstone
Chert (Grey-Green Var.)
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Ocean Jasper or Orbicular Jasper
SiO2
mineral
Diamond
Carbon (C)
gemstone
Diamond
Diamond (pure Carbon, C)
mineral
Quartz Vein in Siltstone
SiO2 (Quartz) on clastic sedimentary matrix
sedimentary
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Gastropod Internal Mold (Steinkern)
Class Gastropoda fossil mold (Phylum Mollusca)
sedimentary
Zircon
Zirconium Silicate (ZrSiO₄)
mineral
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of organic matter)
fossil
Meteorite
Chondrite / Iron-Nickel Meteorite fragment
meteorite
Chert (or potentially massive Quartz/Quartzite)
SiO2 (Silicon Dioxide)
sedimentary (if chert) / metamorphic (if quartzite)
Fossiliferous Chert (with Fossil Shells)
Silicon Dioxide (SiO2) with biogenic inclusions
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Granite Pebble
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Blue calcite (probable)
Calcite, CaCO₃
mineral
Chert (Nodule)
Cryptocrystalline Quartz (SiO2)
sedimentary
Fossil Shark Tooth
Chondrichthyes (Class)
fossil
Limestone and Quartz Gravel with Petrified Wood
Sedimentary gravel aggregate and fossilized wood
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Black Onyx and Mother of Pearl
Cryptocrystalline Quartz (SiO2) and Nacre (Calcium Carbonate)
mineral