Pebble
Lithic fragment / Sedimentary clast
sedimentary
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Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Limestone
Sedimentary carbonate rock (CaCO3)
sedimentary
Basalt Pebble
Extrusive Igneous Rock
igneous
Quartz (Raw Specimen)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Fulgurite
Lechatelierite (Silica glass tube)
mineral
Basalt
Extrusive Igneous Rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Limonite/Goethite Iron Concretion
Hydrated iron oxide-hydroxide mixture (FeO(OH)·nH2O)
mineral
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Argillite
Argillite (compact, clay-rich sedimentary rock)
sedimentary
Basalt
Mafic extrusive igneous rock
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Septarian Nodule
Septarian Concretion (Calcite, Aragonite, and Limestone)
sedimentary
Limonite
FeO(OH)•nH2O
mineral
Basalt Pebble
Extrusive Igneous Rock
igneous
Chert
Microcrystalline quartz (SiO2)
sedimentary
Scoria
Mafic to intermediate volcanic rock
igneous
Greenstone
Metamorphic mafic rock (greenschist facies)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Basalt
Extrusive Igneous Rock
igneous
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Chert / Flint Nodule
Microcrystalline quartz (SiO2)
sedimentary
Unknown Rock Fragment
Undetermined
igneous
Chrysocolla
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Common Pebble / Sedimentary Rock Fragment
Lithified clastic sediment
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Amazonite
Microcline feldspar (KAlSi3O8)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartz Crystal Cluster with Iron Stain
Silicon Dioxide (SiO2)
mineral
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Sugilite
Sugilite (KNa2(Fe,Mn,Al)2Li3Si12O30)
mineral