Not A Rock (Man Made Polymer)

Lapis Lazuli

Lapis Lazuli (A metamorphic rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Pink Quartzite Pebble

Metamorphic Quartzite (SiO2 with iron oxide inclusions)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

River Pebble (Quartzite/Siltstone mixture)

Silicon Dioxide (SiO2) mixture with varied clastic minerals

Sandstone

Arenite/Quartz Arenite

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Oolitic Limestone (Egg Stone)

Oolite (Chemical sedimentary rock, primarily CaCO3)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz with Limonite/Goethite staining)

Agate (Moss or Plume Agate variety)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Unakite

Unakite (Metasomatized Granite)

Fossiliferous Limestone (Coquina / Shell Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Chert (often called Jasper or River Rock)

Chert (SiO2)

Banded Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Vesicular Basalt (Scoria)

Mafic extrusive volcanic rock (predominantly Plagioclase feldspar and Pyroxene)

Quartz Pebble (with Mica or Iron staining)

Silicon Dioxide (SiO2)

Jasper with Quartz inclusions

Silicon Dioxide (SiO2) - Microcrystalline Chalcedony

Sandstone with Manganese Dendrites/Oxide coatings

Arenite with Pyrolusite and Romanechite (MnO2)

Red Jasper

Jasper (Silicon Dioxide, SiO2 with Iron Oxide impurities)

Jasper / Chert (River Pebble)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Jasper with Hematite inclusions

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)

Tufa (Limestone)

Calcareous Tufa (CaCO3)

Quartzite with Iron Inclusions

Metamorphic Silicon Dioxide (SiO2) with impure Limonite/Hematite

Red Sandstone

Arenite (Ferruginous Sandstone)

Smoky Quartz and Biotite Schist

Quartz-Biotite Schist (SiO2 + K(Mg,Fe)3AlSi3O10(F,OH)2)

Red Jasper with Quartz Veining

Silicon Dioxide (SiO2) - Microcrystalline Quartz with Iron Oxide impurities (Hematite)

Clear Quartz

Silicon Dioxide (SiO2)

Quartzite Pebble

Meta-quartzite

Jasper (likely Lake Superior Jasper)

Jasper (Silicon Dioxide, SiO2)

Jasper (Iron-rich Microcrystalline Quartz)

Silicon Dioxide (SiO2) with Hematite inclusions

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Basalt Porphyry (River Pebble)

Porphyritic Basalt

Yellow Calcite

Calcium Carbonate (CaCO3)

Milky Quartz

Silicon Dioxide (SiO2)

Bicolor Quartz Pebble

Silicon Dioxide (SiO2) with mineral inclusions

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Chert Nodule (Commonly known as Flint or River Rock)

Silicon Dioxide (SiO2)

Quartz River Pebble

Quartz (Silicon Dioxide, SiO2)

Iron-stained Milky Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions

Ruby in Fuchsite (often confused with Ruby in Zoisite)

Corundum (Al2O3) in Chromium-rich Muscovite (KAl2(AlSi3O10)(OH)2)