Chert
Microcrystalline quartz (SiO2)
sedimentary
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Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Slate
Metamorphic Pelitic Rock
metamorphic
Gneiss
Metamorphic Gneiss
metamorphic
Granite
Intrusive Igneous Rock
igneous
Flint
SiO2 (Microcrystalline Quartz / Chert)
sedimentary
Porphyritic Basalt or Diabase (Pebble)
Extrusive / Subvolcanic Igneous Rock
igneous
Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Green Slate or Metamorphic Rock
Metamorphic rock (chlorite/actinolite-bearing)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Fossilized Bryozoan
Bryozoa
fossil
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Granite
Granite (Intrusive Igneous Rock)
igneous
Granite Pebble
Intrusive Igneous Rock
igneous
Fossilized Brachiopod
Phylum Brachiopoda
fossil
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Sedimentary Rock (Quartz Arenite)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Galena
Lead sulfide (PbS)
mineral
Granite or Quartzite fragment
Granite / Quartzite
igneous/metamorphic
Argillite / Mudstone
Argillaceous sedimentary rock
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Generic Pebble
Lithic Fragment
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Sandstone Pebble
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Smoky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Sandstone (Arenite)
sedimentary
Red Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Graphic Granite
Graphic Granite (Pegmatitic Alkaline Granite)
igneous
Pumice
Pumice (Volcanic Glass Foam)
igneous
Granite
Felsic intrusive igneous rock
igneous
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Sandstone
Arenite
sedimentary