Sandstone (Quartzite-rich Pebble)
Arenite (composed primarily of SiO2)
sedimentary
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Sandstone (Pebble)
Clastic sedimentary rock (SiO2 primary)
sedimentary
Banded Sandstone (Zebra Stone)
Arenite with Iron Oxide Banding (Liesegang rings)
sedimentary
Sandstone (specifically Red Sandstone)
Arenite (primarily Quartz, SiO2)
sedimentary
Red Sandstone
Arenite (with Iron Oxide)
sedimentary
Sandstone (Quartz Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (likely Arkose or Quartz Sandstone)
Arenite (SiO2 principal component)
sedimentary
Granite (specifically Rapakivi Granite)
Phaneritic Felsic Igneous Rock (Granite)
igneous
Sandstone (Pebble)
Sandstone (arenite, arkose, wacke depending on composition)
sedimentary
Thunderegg (Agetized Geode nodule)
Rhyolitic Agate Nodule (SiO2 filling volcanic cavities)
igneous
Quartz (Milky/Crystalline variety)
Silicon Dioxide (SiO2)
mineral
Quartz Vein with Iron Staining
Silicon Dioxide (SiO2)
mineral
Quartz / Chert
Silicon Dioxide (SiO2)
Mineral / Sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide cement)
sedimentary
Diorite
Intermediate plutonic igneous rock
Igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Mica Schist
Mica Schist (Schistose metamorphic rock rich in Muscovite/Biotite)
metamorphic
Manganese-coated Sandstone
Clastic sedimentary rock with Manganese Oxide (often Pyrolusite or Psilomelane)
sedimentary
Obsidian
Obsidian (Volcanic Glass, complex silicate)
igneous
Sandstone (Micaceous)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Quartzite-rich Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Breccia
Breccia
sedimentary
Granite
Granite (Mainly Quartz, Feldspar, and Mica)
igneous
Basalt with Scoria/Vesicular Texture
Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Dalmatian Stone
Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite
igneous
Hag Stone
Porous sedimentary rock (typically Flint, Chert, or Sandstone) with naturally occurring holes
sedimentary
Basalt
Basalt (composition predominately Plagioclase feldspar and Pyroxene)
igneous
Nuummite
Nuummite (Orthorhombic amphiboles: Anthophyllite and Gedrite)
metamorphic
Quartz (likely Milky Quartz)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Quartz (Milky/Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Geode in Sedimentary Matrix
Silicon Dioxide (SiO2) within a limestone/dolostone host
mineral
Chert / Flint Nodules in Limestone
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Quartz (Milky/Yellowish Pebble)
Silicon Dioxide (SiO2)
mineral
Milky Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Ironstone (Limonitic Concretion)
Limonite (FeO(OH)·nH2O) with Goethite and Hematite inclusions
sedimentary
Basalt with Iron Oxidation
Mafic Igneous Basalt
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral