Basalt Pebble
Extrusive igneous rock
igneous
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Flint / Chert Pebble
Microcrystalline quartz (SiO2)
sedimentary
Pebble
Lithic fragment (Quartzite or general rock pebble)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Banded Agate Pebble
Chalcedony (SiO2)
sedimentary
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Chrysocolla in Quartz
Hydrated copper phyllosilicate with silicon dioxide (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O + SiO2)
mineral
Red Jasper
Microcrystalline Quartz (Chalcedony), SiO2
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Banded Sedimentary Rock
Sedimentary rock with mineral veins/banding
sedimentary
Red Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Veined Quartzite Pebble (Heart-Shaped)
Metamorphosed quartz-rich sandstone with quartz veins
sedimentary
Quartz Vein Rock with Feldspar
Silicon Dioxide (SiO2) with Potassium Feldspar
mineral
Fossilized Gastropod Steinkern
Class Gastropoda internal mold
fossil
Flint / Chert Nodule
Microcrystalline quartz (SiO2)
sedimentary
Pitted Sedimentary Rock / Cupstone
Sedimentary rock with weathering pit (arenite / sandstone)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Quartz variety (SiO2) with fuchsite inclusions
mineral
Labradorite
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
mineral
Green Aventurine
Quartz with Fuchsite inclusions (SiO2)
mineral
Labradorite
Plagioclase Feldspar (Ca,Na)(Al,Si)4O8
mineral
Granite
Felsic intrusive igneous rock
igneous
Quartzite
Metamorphic Quartzite
metamorphic
Quartzite
Quartzite (Metamorphic Quartz Sandstone)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Graphic Granite / Pegmatite
Graphic Granite (Alkali Feldspar and Quartz)
igneous
Echinoid Fossil / Fossilized Sea Urchin
Echinoidea
fossil
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Quartz Arenite
sedimentary
Quartzite Pebble
Metamorphic Quartzite
metamorphic
Flint
SiO2 (Microcrystalline Quartz / Chert)
sedimentary
Flint
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Quartzite Pebble
Metamorphic Quartzite
metamorphic
Ironstone / Hematite Concretion
Iron oxide / Fe2O3
sedimentary