Limestone
Calcium Carbonate (CaCO3)
sedimentary
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Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite or arkose)
sedimentary
Basalt Pebble
Extrusive Igneous Rock
igneous
Fossilized Bone
Petrified Bone (Fluorapatite / Calcium Phosphate replacement)
fossil
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Gold
Gold (Au)
mineral
Fire Quartz (Hematoid Quartz)
Silicon Dioxide with Hematite Inclusions (SiO2)
gemstone
Jasper / Chert
Microcrystalline Quartz (SiO2)
sedimentary
Fulgurite
Lechatelierite (Fulgurite / Petrified Lightning)
mineral
Granite
Felsic intrusive igneous rock
igneous
Jade Ring
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)
gemstone
K-Feldspar (Potassium Feldspar / Pink Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Turquoise
Hydrated copper aluminum phosphate, CuAl6(PO4)4(OH)8·4H2O
mineral
Limestone (fossiliferous or weathered)
Sedimentary carbonate rock primarily composed of calcium carbonate (CaCO3)
sedimentary
Sandstone
Quartzose Sandstone (Sedimentary Rock)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Chert / Flint
Cryptocrystalline quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline quartz (SiO2)
sedimentary
Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Sandstone (Common Quartz Pebble/Rock)
Sedimentary rock / Quartz arenite
sedimentary
Coral Fossil (Fossilized Coral)
Hexagonaria or similar rugose/tabulate coral fossil (Calcium Carbonate, CaCO3)
fossil
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
White Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Barite
Barium Sulfate (BaSO4)
mineral
Quartz Crystal Matrix
Silicon Dioxide (SiO2)
mineral
Wulfenite
Lead Molybdate, PbMoO4
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Felsic intrusive igneous rock
igneous
Fossil Coral
Hexagonaria (or Rugose/Tabulate coral fossilized in calcium carbonate)
fossil
Silver Nugget
Native Silver (Ag)
mineral
Basalt
Extrusive igneous rock
igneous
Gravel and Pavement Aggregates
Unconsolidated rock fragments / detrital sediments
sedimentary
Crushed Stone Ballast
Crushed Limestone or Granite Aggregate
sedimentary
Green Aventurine
Quartz (SiO2) with fuchsite inclusions
mineral
Crushed Limestone
Calcium Carbonate (CaCO3)
sedimentary
Basalt Pebble
Extrusive Igneous Rock
igneous
Quartz
Silicon Dioxide (SiO2)
mineral