Quartzite
Metamorphic Quartzite
metamorphic
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K-feldspar Granite / Red Granite Fragment
Alkali feldspar granite (Plutonic igneous rock)
igneous
Red Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Fossiliferous Limestone
Bioclastic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Granite Pebble
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphic Quartzite
metamorphic
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Basalt Pebble
Extrusive Igneous Rock
igneous
Flint / Chert
Microcrystalline quartz (SiO2)
sedimentary
Quartzite
Quartzite (Metamorphic Quartz Arenite)
metamorphic
Limestone with Fossil Fragment
Bioclastic limestone (Calcium carbonate, CaCO3)
sedimentary
Granite Pebble
Intrusive Igneous Rock
igneous
Porphyritic Igneous Pebble / Porphyry
Porphyritic Igneous Rock
igneous
Granite Pebble
Intrusive Igneous Rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Fossilized Coral (Rugose Coral / Horn Coral)
Rugosa / Scleractinia
fossil
Horn Coral Fossil
Rugosa (Order Rugosa)
fossil
Fossil Sponge / Horn Coral / Crinoid Stem
Phylum Porifera or Cnidaria fossilized in calcium carbonate / silica
fossil
Crinoid Stem Fossil
Crinoid columnal (Echinodermata)
fossil
Fossilized Nut / Coprolite / Concretion
Trace Fossil / Permineralized Plant Material
fossil
Agate Nodule
Silicon Dioxide (Quartz/Chalcedony), SiO2
sedimentary
Fossil Coral
Hexagonaria or Rugose coral fossil in limestone/silica matrix
fossil
Horn Coral Fossil
Rugose coral (Order Rugosa)
fossil
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Jasper / Agate
Silicon dioxide (SiO2)
sedimentary
Quartz Vein Rock
Silicon Dioxide (SiO2)
mineral
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Blue Quartz
Silicon Dioxide (SiO2) with inclusions
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Chrysoprase-bearing Quartz
Silicon Dioxide with Nickel Inclusions (SiO2)
mineral
Red Jasper
Microcrystalline Quartz (Chalcedony), SiO2
sedimentary
Granite
Intrusive igneous rock
igneous
Pyrite in Quartz
Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)
mineral
Petoskey Stone
Hexagonaria percarinata
fossil
Petoskey Stone
Hexagonaria percarinata
fossil
Pyrite
Iron Sulfide (FeS2)
mineral