Mineral Side Rock

Quartz Pebble (with Mica or Iron staining)

Silicon Dioxide (SiO2)

Nuummite

Nuummite (ortho-amphibole rock)

Man-made Synthetic Material (Costume Faux Fur)

Synthetic Polymer (Polyester/Acrylic)

Basalt

Extrusive mafic volcanic rock

Basalt (with possible Olivine inclusions)

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Basalt (Weathered/River worn)

Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)

Quartzite

Quartzite (primarily SiO2)

Basalt with Iron Oxide staining

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Pink Granite

Granite (Phaneritic Igneous Rock)

Schist

Mica Schist

Milky Quartz (Tumbled/Polished)

Silicon Dioxide (SiO2)

Blue Onyx (Dyed Agate/Chalky Chalcedony)

Silicon Dioxide (SiO2) with artificial pigment

Magnetite with Serpentine

Magnetite (Fe3O4) in Serpentine Matrix

Petrified Wood

Silicified Wood (SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Agate (Chalcedony Variation)

Silicon Dioxide (SiO2)

Amethyst

Silicon Dioxide with Iron impurities (SiO2 + Fe3+)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Specular Hematite

Hematite (Fe2O3)

Quartz Pebble (Iron-stained)

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Pyrite in Quartz

Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)

Mahogany Obsidian

Obsidian (Volcanic Glass) with Hematite/Magnetite inclusions

Garnet-Mica Schist

Garnetiferous Porphyroblastic Schist

Sandstone with Calcite Vein

Clastic sedimentary rock (primarily SiO2) with Calcium Carbonate (CaCO3) infilling

Amethyst (Tumbled Chips)

Amethyst (Silicon Dioxide with Iron impurities, SiO2)

Garnet

Almandine (Fe3Al2(SiO4)3)

Serpentinite

Serpentinite (composed largely of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile: Mg3Si2O5(OH)4)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2)

Amethyst

Crystalline Quartz (SiO2) with iron impurities

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Iron-Stained Quartz/Quartzite

Silicon Dioxide (SiO2) with iron oxides (Limonite/Hematite)

Granite

Granite (Phaneritic intrusive igneous rock)

Quartz (Sunstone-like Chalcedony)

Silicon Dioxide (SiO2)

Limestone with Secondary Mineralization

Calcium Carbonate (CaCO3)

Quartz Geode

Silicon Dioxide (SiO2)

Banded Agate (Onyx type)

Silicon Dioxide (SiO2)

Carnelian

Carnelian (Cryptocrystalline Quartz, SiO2)

Pink Dyed Agate

Silicon Dioxide (SiO2) - Variety Agate

Quartz (Sand Grain size)

Silicon Dioxide (SiO2)

Tiger's Eye (Inlaid in a band)

SiO2 (Silicon Dioxide with Crocidolite inclusions)