Sedimentary Rock (Technically A Microcrystalline Quartz Mineral Aggregate)

Ferruginous Quartz on Ironstone

Silicon Dioxide (SiO2) with Hematite (Fe2O3)

Quartzite pebble

Quartzite (SiO2)

Quartzite

Quartzite (primarily SiO2)

Ironstone Concretion (Moqui Marble Type)

Goethite/Hematite-cemented Sandstone Concretion

Ironstone Concretion / Limonite-stained Siltstone

Ironstone (primarily Limonite FeO(OH)·nH2O and Siltstone)

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)

Chert (Jasper/Flint variant)

Microcrystalline Quartz (SiO2)

Quartz Vein with Iron Staining

Silicon Dioxide (SiO2) with limonite/hematite staining

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide cement)

Granite

Granite (composed primarily of Quartz, Feldspar, and Mica)

Quartzite

Quartzite (SiO2)

Banded Sandstone (River Pebble)

Clastic Sedimentary Rock (primarily Quartzite and Feldspar grains)

Quartzite Pebble

Quartzite (primarily SiO2)

Chert (Iron-stained)

Chert (Microcrystalline Quartz, SiO2)

Rock Crystal Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Granitic Gneiss

Gneiss (High-grade regional metamorphic rock)

Red Sandstone

Arenite (with Iron Oxide / Hematite cementation)

Chert (Arrowhead)

Chert (primarily Microcrystalline Silica, SiO2)

Blue Chalcedony Geode (with Quartz Druzy)

Silicon Dioxide (SiO2) - Microcrystalline variety of Quartz

Quartzite

Quartzite (primarily SiO2)

Black Jasper

Silicon Dioxide (SiO2) with inclusions

Chert (White Chert)

Silicon Dioxide (SiO2)

Orbicular Jasper (Ocean Jasper or Poppy Jasper variant)

Silicon Dioxide (SiO2) with various inclusions

Sandstone (Greywacke/Lithic Sandstone)

Arenite / Lithic Sandstone

Scoria (Volcanic Rock)

Scoria (often basaltic scoria)

Quartzite

Quartzite (primarily SiO2)

Pink Quartzite

Quartzite (primarily SiO2)

Mookaite Jasper

Silicified Radiolarite (Silicon Dioxide: SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Quartz Vein in Sandstone

Sandstone with Hydrothermal Quartz (SiO2)

Sandstone (River Pebble)

Arenite

Granite

Granite (Phaneritic intrusive igneous rock)

Sandstone

Sandstone (Clastic Sedimentary Rock)

Sandstone (Quartzose)

Arenite (Formula: SiO2 primary, with various cements)

Greywacke

Lithic wacke (variety of Sandstone)

Slate

Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)

Zebra Rock (Zebra Stone / Ribbon Stone)

Siltstone with Ferruginous Banding (Primarily Quartz, Kaolinite, and Hematite)

Black Mountain Stone (Seiryu Stone)

Limestone with Calcite veins (CaCO3)

Granite

Felsic Intrusive Igneous Rock (SiO2, Al2O3, K2O, Na2O)

Gneiss

Gneiss (pronounced 'nice')

Biotite Mica

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)