Mineral Like Byproduct (Often Mistaken For Igneous Rock Or Meteorite)

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Chalcedony Nodule (Agate/Chert)

Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)

Red Sandstone

Arenite (Fe2O3 rich)

Quartz

Silicon dioxide (SiO₂)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Pegmatite (Granitic)

Granitic Pegmatite containing Quartz, Feldspar, and Tourmaline (Schorl)

Venetian Gold Granite

Phaneritic Felsic Igneous Rock (Granite)

Sandstone or Mudstone with Iron Staining

Ferruginous Sandstone/Mudstone

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Clastic Sedimentary Rock (SiO2 with Fe2O3/FeOOH cement)

Conglomerate

Conglomerate

Quartzite

Quartzite (SiO2)

Basalt

Basalt (Mafic Extrusive)

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2)

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (primarily SiO2)

Chert (specifically Banded Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 oxides)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Shale

Shale (composition varies: primarily clay minerals and quartz)

Black Obsidian

Obsidian, volcanic glass (Amorphous SiO₂)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Tree Agate

Silicon Dioxide (SiO2) - Dendritic Agate/Chalcedony

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Flower Agate

Chalcedony (SiO2) with Scolecite/Opaque inclusions

Jasper with Quartz Veining

Silicon Dioxide (SiO2) - Opaque cryptocrystalline variety of Quartz

Quartz (specifically Milky Quartz/Quartzite)

Silicon Dioxide (SiO2)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Petrified Wood

Silicified Wood (SiO2)

Obsidian

Volcanic Glass (SiO2, usually 70% or more)

Banded Agate (Tumbled)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Gold Nugget

Native Gold (Au)

Granite

Phaneritic Igneous Rock (composed mostly of Quartz, Feldspar, and Mica)

Mixed Tumbled Gemstones and River Rocks

Mixed Decorative Stones (predominantly Silicon Dioxide - SiO2 variants)

Muscovite Mica

Muscovite (Potassium Aluminum Silicate Hydroxide Fluoride), KAl2(AlSi3O10)(OH,F)2

Red Sandstone

Arenite (with Iron Oxide / Hematite), Formula: SiO2 (Quartz) + Fe2O3 (Hematite coating)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Pumice

Pumice (a highly vesicular felsic volcanic rock)