Sedimentary Rock (Technically A Microcrystalline Quartz Mineral Aggregate)

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Sandstone

Arenite (SiO2, often with CaCO3 or Fe2O3 cement)

Chalcedony (Agate/Carnelian type)

Silicon Dioxide (SiO2)

Granite

Phaneritic Felsic Igneous Rock

Quartz / Common Agate

Silicon Dioxide (SiO2)

Chert (Limestone-based)

Silicon Dioxide (SiO2)

Basalt with Quartz/Calcite Veins

Basalt (Aphanitic Mafic Igneous Rock)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Basalt with Quartz Veins

Basalt (SiO2 range 45-52%)

Basalt with Amygdaloidal Inclusions

Aphanitic Mafic Volcanic Rock (Basalt)

Sandstone (Greywacke/Siltstone variant)

Clastic Sedimentary Rock (composed primarily of Quartz SiO2 and Feldspar)

River Pebbles and Quartz

Mixed Igneous, Sedimentary, and Metamorphic Rocks (Silicon Dioxide SiO2 dominant)

Dalmation Stone (often called Dalmatian Jasper)

Antiperthite-rich Microgranite

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Sandstone (Quartzite-rich)

Clastic sedimentary rock (primarily SiO2)

Granite Cobble / Rounded Granite River Rock

Granite

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Sandstone (likely Greywacke or Siltstone variety)

Arenite / Siltstone (primarily SiO2)

Rough Quartz (with potential Host Rock)

Silicon Dioxide (SiO2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Banded Chert (Flint/Jasper variety)

Microcrystalline Quartz (SiO2)

Sandstone

Arenite (predominantly Quartz Sandstone)

Granite

Plutonic felsic rock (Quartz, Feldspar, Mica)

Red Quartzite River Stone

Quartzite (SiO2)

Sandstone (Ferruginous)

Sandstone (Clastic sedimentary rock, predominantly SiO2 with Fe2O3 cement)

Granite

Granite (Felsic Plutonic Rock)

Quartz Geode

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide cement)

Banded Chert (Agate)

Silicon Dioxide (SiO2)

River Quartzite Siltstone

Quartz-rich Meta-siltstone (SiO2 dominated)

Quartzite with Chlorite/Epidote

Metamorphosed Quartzite (SiO2)

Jasper (specifically Yellow/Red Jasper)

Silicon Dioxide (SiO2) with iron oxide inclusions

Moss Agate

SiO2 (Silicon Dioxide) with dendritic inclusions

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Quartzite (Milky)

Quartzite (SiO2)

Sparkling Druzy Quartz on Matrix

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert (specifically Tan/Yellow Chert)

Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)

Sandstone-based Concrete Fragment

Cementitious Composite with Sedimentary Aggregate

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz Cluster

Silicon Dioxide (SiO2)