Sedimentary Rock (Technically A Microcrystalline Quartz Mineral Aggregate)

Banded Agate (Tumbled)

Cryptocrystalline Quartz (SiO2)

Jasper (likely river-worn)

Silicon Dioxide (SiO2)

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Chert (specifically White Chert or Novaculite)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Quartz (Milky/Smoky variety)

Silicon Dioxide (SiO2)

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Carnelian (Chalcedony)

Silicon Dioxide (SiO2) with Iron Oxide impurities

Brown Sandstone

Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Granite

Phaneritic Felsic Intrusive Igneous Rock

Ironstone Concretion (Boji Stone/Moqui Marble type)

Goethite/Hematite-encrusted Sandstone Concretion

Sandstone

Arenite (SiO2 primarily)

Sandstone

Arenite (composed primarily of Quartz, SiO2)

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

Chert (Nodule)

Chert (mainly Microcrystalline or Cryptocrystalline Quartz, SiO2)

Shiva Lingam

Cryptocrystalline Quartz (Jasproid/Sandstone) with Iron Oxide (Fe2O3)

Red Sandstone

Clastic Terrigenous Sedimentary Rock (typically Hematitic Quartz Arenite or Arkose)

Sandstone (Ferruginous)

Arenite (SiO2 with iron oxide impurities)

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Granite

Granite (Felsic Plutonic Rock)

Sandstone

Clastic Sedimentary Rock (composed mostly of quartz and/or feldspar)

Herkimer Diamond (Quartz Crystal)

Silicon Dioxide (SiO2)

Red Jasper

Jasper (Silicate mineral - SiO2)

Granite

Phaneritic Plutonic Igneous Rock (primarily composed of quartz, alkali feldspar, and plagioclase)

Banded Agate (with Quartz Geode Center)

Silicon Dioxide (SiO2)

Red Jasper

Jasper (a cryptocrystalline variety of Quartz, SiO₂)

Banded Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Sandstone (likely Arkosic)

Clastic Sedimentary Rock (Sandstone)

Fossiliferous Sandstone (with Brachiopod or Bivalve mold)

Clastic Sedimentary Rock with Macrofossil Mold

Sandstone (Red/Brown Variety)

Arenite (SiO2 with iron oxide impurities)

Vesicular Basalt (Amygdaloidal)

Vesicular Basalt (Fe-Mg rich extrusive volcanic rock)

Granite Glacial Erratic

Intrusive Phaneritic Felsic Rock (Granite)

Quartz (Milky or White Quartz)

Silicon Dioxide (SiO2)

Chalcedony

Cryptocrystalline Quartz (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Dalmatian Jasper

Peralkaline rhyolite

Chert (Flint)

Microcrystalline Quartz (SiO2)

Granite

Granite (Phaneritic intrusive igneous rock)

Brecciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Quartz (likely Yellow/Orange variety, possibly Citrine or Chalcedony with iron staining)

Quartz (SiO₂)

Granite Pebble

Granite (Phaneritic intrusive igneous rock)