Industrial Byproduct (Anthropogenic Rock Like Material)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Garnet-bearing Schist

Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist

Banded Agate (specifically Sardonyx or Red Agate)

Silicon Dioxide (SiO2)

Chert (specifically a nodule with Chalcendony/Agate banding)

Microcrystalline Quartz (SiO2)

Chert / Pink Flint

Cryptocrystalline Quartz (SiO2)

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone

Arenite (Sedimentary rock composed of sand-sized grains, primarily SiO2)

Anthracite Coal

Low-grade metamorphic carbonaceous rock

Basalt

Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Chert (with Quartz veins)

Microcrystalline Quartz (SiO2)

Basalt

Extrusive Igneous Basalt (contains Plagioclase Feldspar and Pyroxene)

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Conglomerate (River Rock Aggregate)

Conglomerate (Lithic-clast conglomerate)

Dalmation Stone (Dalmation Jasper)

Peralkaline rock (primarily Feldspar and Quartz with Arfvedsonite spots)

Sandstone (Quartzite-rich)

Clastic sedimentary rock (SiO2 primary)

Quartzite (Iron-stained)

Metamorphosed Quartz-rich Rock (SiO2)

Basalt

Basalt (primarily Pyroxene and Plagioclase)

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Chert

Microcrystalline Quartz (SiO2)

Red Sandstone (Iron-rich Sandstone)

Clastic Sedimentary Rock - Quartz Arenite / Arkose with Hematite Cement

Petrified Wood (Silicified Wood)

Silicified Wood / Silicon Dioxide (SiO2)

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Chert (Commonly known as Flint)

Microcrystalline Quartz (SiO2)

Schist with Biotite Inclusion

Biotite-bearing Mica Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)

Caliche (with Lichen Cover)

Calcium carbonate-cemented soil layer (CaCO3)

Blue Kyanite

Kyanite (Al2SiO5)

Limestone with Calcite

Sedimentary Calcium Carbonate (CaCO3)

Chert (Yellow Jasper/Quartzite Pebble)

Microcrystalline Silicon Dioxide (SiO2)

Chalcedony (Moonstone variant or White Agate)

Silicon Dioxide (SiO₂)

Basalt

Basalt (Igneous Volcanic)

Artificial Rock Face (Faux Rock)

Glass Fiber Reinforced Concrete (GFRC)

Siltstone with Quartz Vein

Siltstone (primarily SiO2, Al2O3, Fe2O3)

Chert (Jasper)

Microcrystalline Quartz (SiO2) with iron oxide impurities

Sapphire (Corundum)

Corundum (Al2O3)

Banded Chert (River Siltstone)

Microcrystalline Quartz (SiO2)

Sandstone (Quartz Arenite)

Sandstone (SiO2 with possible mineral cements)

Quartz on Greenstone

Silicon Dioxide (SiO2) on Altered Igneous Geologic Unit

Agate (Grey Agate Slice)

Microcrystalline Quartz (SiO2)

Conglomerate

Conglomerate (clastic sedimentary rock)

Schist with Quartz/Mica

Mica Schist (primarily Muscovite and Quartz)