Sandstone (clastic)
Clastic Sedimentary Rock (primarily composed of SiO2)
sedimentary
Category
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Vesicular Basalt (or Scoraceous Basalt)
Basalt with vesicular texture
igneous
Vesicular Basalt (or Scoria)
Vesicular Basalt
igneous
Quartz (Milky/Common Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone (with Quartz veining)
Arenite (primarily SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Basalt Scoria
Vesicular Basalt
igneous
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Chert (Common Opal/Agate mixture)
Microcrystalline Quartz (SiO2)
sedimentary
Tiger's Eye (Rough)
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Sandstone
Arenite (Quartz-rich sedimentary rock)
sedimentary
Agate Geode / Nodular Chalcedony
Silicon Dioxide (SiO2) with impurities
mineral
Jasper Agate (Carnelian Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Gastropod Steinkern (Internal Mold Fossil)
Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix
sedimentary
Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Crazy Lace Agate
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt
Basalt with secondary mineral infilling (commonly SiO2 or Zeolites)
igneous
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Lunar Meteorite (Feldspathic Breccia)
Lunar Feldspathic Breccia
igneous
Porphyry
Porphyritic Rhyolite or Andesite
igneous
Basalt with Vesicles
Vesicular Basalt
igneous
Vesicular Basalt
Basalt (Mafic Extrusive Volcanic Rock)
igneous
Basalt pebble
Basalt (Mafic Extrusive Igneous Rock)
igneous
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Granite
Granite (Felsic intrusive igneous rock)
igneous
Vesicular Basalt with Amygdaloidal Infill
Basalt (Mafic Extrusive Igneous Rock)
igneous
Basalt River Pebble
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Vesicular Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Basalt (with possible weathering or secondary mineral crust)
Basalt (Aphanitic Mafic Igneous Rock)
Igneous
Basalt Riverstone
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Basalt River Stone
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Basalt
Basalt (extrusive volcanic mafic rock)
igneous
Granitoid (Common Granite)
Intrusive Igneous Granite-type Rock
igneous
River Pebble (Basalt)
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Basalt (Vesicular)
Basalt (Extrusive Mafic Igneous Rock)
igneous
Honeycomb Coral Fossil
Favosites (extinct genus of tabulate coral)
sedimentary
Cockle Shell (Fossil or Recent)
Class Bivalvia, Family Cardiidae (e.g., Cerastoderma edule for common cockle)
Sedimentary (Biogenic, a type of fossil)