Granite (Gneissic / Weathered Pebble)
Felsic intrusive igneous rock (Granite)
igneous
Category
Not A Rock (Synthetic Material)
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Geode with Quartz/Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Sandstone (likely Fossiliferous)
Arenite / Fossiliferous Sandstone (SiO2 composition)
sedimentary
Petrified Wood
Silicified wood (SiO2)
fossil
Sandstone Pebble
Sandstone (SiO2 rich clastic rock)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Porphyry (likely Porphyritic Andesite or Basalt)
Porphyritic Igneous Rock
igneous
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Sandstone (Quartzose Sandstone)
Sandstone (SiO2 with various trace minerals)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Quartz-rich)
Arenite (primarily SiO2)
sedimentary
Chalcedony
Silicon dioxide (SiO2)
mineral
Red Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Weathered porphyritic volcanic rock (likely andesite or basalt)
Aphanitic to porphyritic andesite–basalt; composition commonly plagioclase, pyroxene, and minor iron oxides
igneous
Sandstone
Sandstone (SiO2 dominated)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Diorite
Diorite
igneous
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz with Limonite/Goethite staining)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Sandstone (SiO2 dominant)
sedimentary
Chert (and Agate/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Coquina
Bioclastic Limestone
sedimentary
Sandstone (Quartzite-rich Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (Ferruginous)
Sandstone (clastic sedimentary rock, mainly SiO2 with iron oxide cement)
sedimentary
Banded Sandstone (Liesegang Rings)
Arenite with Liesegang rings (SiO2/Fe2O3)
sedimentary
Sandstone (likely Ferruginous)
Sandstone (SiO2 with iron oxides)
sedimentary
Dark weathered pebble, likely basalt
Basalt (fine-grained mafic volcanic rock; typically plagioclase, pyroxene, and olivine)
igneous
Sandstone
Arenite
sedimentary
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Banded Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Glacial Erratic (Graywacke/Sandstone)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Sandstone (Quartzite-rich)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Chert Nodule (Flint)
Chert (Cryptocrystalline Silica - SiO2)
sedimentary
Dark mafic rock, likely basalt
Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine
igneous
Quartz Vein in Metamorphic Rock
Silicon Dioxide (SiO2) within Metasedimentary host
metamorphic
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary
Fossil Shark Tooth
Selachii (fossilized dentition)
fossil