Mineral, Specifically A Rock Fragment

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Limonite/Hematite inclusions

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Hematite/Limonite) inclusions

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Garnet Schist

Almandine Garnet-Mica Schist (X₃Y₂(SiO₄)₃)

Dalmatian Stone

Peralkaline rhyolite with arfvedsonite (formerly incorrectly called Dalmatian Jasper)

Granite Pebble (River Rock)

Granite (composed primarily of Quartz, Feldspar, and Mica)

Glauconitic Sandstone (Greensand)

Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2

Granite

Granite (compositionally: Quartz, Feldspar, Mica)

Quartz (Milky Quartz/Citrine Type)

Silicon Dioxide (SiO2)

Turquoise

Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O

Carnelian Agate

Silicon Dioxide (SiO2)

Rose Quartz

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

Lava Stone and Chakra Beads

Basalt (with various mineral/synthetic beads)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Calcite Geode

Calcium Carbonate (CaCO3)

Vesicular Basalt

Vesicular Basalt (Aphanitic Mafic Igneous Rock)

Unakite

Unakite (altered granite)

Amphibolite with Hornblende

Amphibole-rich Metamorphic Rock (Ca2(Mg,Fe)5Si8O22(OH)2)

Blue Lace Agate

Cryptocrystalline Quartz (SiO2) with trace minerals

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of iron oxide)

Banded Calcite (often sold as 'Travertine' or 'Mexican Onyx')

Calcium Carbonate (CaCO3)

Schist

Crystalline Metamorphic Rock (Schistose)

Schist with Quartz/Mica

Mica Schist (primarily Muscovite and Quartz)

Vesicular Basalt

Extrusive mafic igneous rock; primarily (Ca,Na)(Mg,Fe,Al,Si)2O6 (Pyroxene) and (Ca,Na)Al(Al,Si)Si2O8 (Plagioclase Feldspar)

Jasper

Silicon dioxide (SiO2) with impurities

Quartz (River Siltstone Quartzite Pebble)

Silicon Dioxide (SiO2)

Thunderegg

Agate-filled Rhyolitic Nodule (SiO2)

Quartz / Rock Crystal

Silicon Dioxide (SiO2)

Desert Rose

Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O) or Barite (Barium Sulfate, BaSO4)

Rose Quartz

Silicon Dioxide (SiO2)

Quartz (Smoky/Milky Pebble)

Silicon Dioxide (SiO2)

Pegmatite

Coarse-grained Igneous Rock (Granitic Pegmatite)

Granite

Phaneritic Felsic Igneous Rock (Granite)

Folded Schist / Gneiss (Metamorphic Rock)

Regional Metaphoric Folded Outcrop (predominantly Schist/Gneiss)

Sandstone with Quartz Vein

Arenite with Quartz (SiO2) Infilling

Goethite (Iron Ore)

Goethite (FeO(OH))

Yellow Chert (Jasper)

Silicon Dioxide (SiO2)

Quartz Geode (River Cobble)

Silicon Dioxide (SiO2)

Granite (Pegmatitic)

Phaneritic Felsic Igneous Rock

Basalt

Mafic Extrusive Igneous Rock

Tumbled Stone Collection (featuring Tiger's Eye, Rose Quartz, and Moss Agate)

Mixed Silicates and Oxides (predominantly SiO2 group minerals)