Sedimentary Or Igneous (Secondary Formation)

Granite

Phaneritic Plutonic Felsic Rock (K-Feldspar + Quartz + Plagioclase)

White Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Bauxite (Laterite Clay)

Bauxite (mixture of Hydrous Aluminum Oxides: Gibbsite Al(OH)3, Boehmite and Diaspore AlO(OH))

Agate (translucent pebble)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Sandstone

Arenite (primarily SiO2)

Sandstone (Quartzose Sandstone)

Arenite (SiO2 principal component)

Sandstone

Arenite (composed primarily of SiO2)

Zebra Rock (Zebra Stone / Ribbon Stone)

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

Tree Agate

Silicon Dioxide (SiO2) with Chlorite/Manganese inclusions

Dinosaur Bone (Gembone)

Petrified Dinosaur Bone (Apatite/Silica replacement)

Yellow Jasper (Limonite-stained Chert)

Silicon Dioxide (SiO2) with Limonite/Goethite inclusions

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides (Goethite/Limonite)

Zebra Jasper

Tumbled Opaque Chalcedony (SiO2)

Sandstone (Quartzose type)

Arenite (primarily SiO2)

Granite

Phaneritic Plutonic Felsic Rock (primarily Quartz (SiO2), Alkali Feldspar, and Plagioclase Feldspar)

Ferruginous Quartz (Iron-stained Quartzite)

Silicon Dioxide (SiO2) with iron oxide inclusions

Fluorite

Fluorite (Calcium Fluoride - CaF2)

Sandstone

Arenite (primarily SiO2)

Chert (Jasper-bearing)

Chert (Silicon Dioxide, SiO2)

Basalt (Road Aggregate)

Basalt (Aphanitic Mafic Igneous Rock)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Mookaite Jasper

Silicified Radiolarite (SiO2)

Jasper with Quartz inclusion

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Chert (specifically Iron-stained River Cobble)

Silicon Dioxide (SiO2)

Sandstone with Concretions / Liesegang Rings

Arenite with iron oxide banding

Moqui Marble

Iron Oxide Concretion (Limonite/Hematite over Sandstone)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Chert (Flint)

Chert (SiO2)

Chert

Microcrystalline silica (SiO2)

Limestone with Calcite Crystals

Calcium Carbonate (CaCO3)

Milky Quartz with Country Rock contact

Silicon Dioxide (SiO2) in contact with Metamorphic/Igneous rock

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz Geode or Druzy Quartz

Silicon Dioxide (SiO2)

Chert / River Pebble

Silicon Dioxide (SiO2)

Sandstone (with Limonite staining)

Arenite (primarily SiO2 with FeO(OH)·nH2O)

Chert (varietal: Jasper or Flint likely, but definitive identification is difficult from image)

SiO₂ (silicon dioxide)

Granite

Granite (a felsic intrusive igneous rock)

Sandstone (lithic wacke)

Arenite / Lithic Wacke (mostly SiO2 with rock fragments)