Sedimentary Rock (Technically Chert, A Microcrystalline Quartz)

Chert (Pink variety/Jasper)

Silicon Dioxide (SiO2)

Copper-bearing Quartz (likely Chrysocolla or Malachite staining)

Cuprite, Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O) or Malachite staining on Quartz/Host Rock

Chert (specifically Pink Chert or Jasperized Chert)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Sandstone (Ferruginous)

Clastic Sedimentary Rock (SiO2 with Fe2O3/FeOOH cement)

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2)

Sandstone

Arenite (SiO2 based)

Quartz Geode

Silicon Dioxide (SiO2)

Yellow Quartzite (Tumbled)

Quartzite (SiO2)

Mahogany Obsidian

Obsidian (Volcanic Glass) with Hematite/Magnetite inclusions

Pyrite on Quartz matrix

Iron Disulfide (FeS2) on Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2) in Host Rock

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within metamorphic/igneous matrix

Chert (often called Flint or Jasper)

Silicon Dioxide (SiO2)

Garnet Schist or Garnet-bearing Quartzite

Metamorphic rock containing Almandine Garnet (Fe3Al2(SiO4)3) and Quartz (SiO2)

Chert (Jasper/Quartzite river stone)

Microcrystalline Silicon Dioxide (SiO2)

Chert (containing fossil leaf impression)

Microcrystalline silicon dioxide (SiO2)

Chert (Black Chert or Flint)

Silicon Dioxide (SiO2)

Chert (Black Chert/Flint)

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 based with quartz grains)

Yellow Quartzite

Quartzite (SiO2)

Orange Quartzite (with Iron Staining)

Quartzite (SiO2)

Chert (Fossiliferous)

Silicon Dioxide (SiO2)

Chert (Jasper)

Silicon Dioxide (SiO2)

Chert (Jasper)

Cryptocrystalline Quartz (SiO2)

Chert (or Flint)

Mocrocrystalline Quartz (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Porphyritic Basalt (Flowerstone)

Porphyritic Basalt (Mafic volcanic rock)

Chert (with Limestone matrix)

Chert (Silica: SiO2)

Sedimentary rock with quartz veining

Laminated siltstone or mudstone with hydrothermal quartz veins

Quartz (likely Clear Quartz or Rock Crystal)

Quartz (SiO2)

Clear Quartz Sphere

Quartz (Silicon Dioxide, SiO2)

Shale (with Iron Oxide staining)

Fissile Mudstone (primarily Quartz and Clay minerals)

Sandstone (Quartzose)

Arenite (Siliciclastic sedimentary rock)

Quartz

Silicon Dioxide (SiO2)

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Sandstone (likely Quartzose)

Sandstone (Principally SiO2)

Shale

Fissile Mudstone

Quartzite

Quartzite (primarily SiO2)

Chert (Common Opal/Chalcedony mixture)

Silicon Dioxide (SiO2)

Chert (and Flint)

Microcrystalline Silica (SiO2)

Chert (Gravel)

Microcrystalline silica (SiO2)

Chalcedony (Agate/Carnelian type)

Silicon Dioxide (SiO2)