Not A Rock (Man Made Polymer)

Chert (often called Flint)

Chert (Microcrystalline or cryptocrystalline Silica, SiO2)

Native Silver

Silver (elemental Ag)

Lapis Lazuli

Na8[Al6Si6O24]S2 (Lazurite component), a rock composed primarily of Lazurite, Calcite, and Pyrite

Lapis Lazuli

Sodium aluminum silicate with sulfur (main component: Lazurite [(Na,Ca)8(AlSiO4)6(SO4,S,Cl)2])

Banded Sandstone

Arenite with Liesegang banding

Basalt

Basalt (Mafic volcanic rock)

Diorite

Intermediate plutonic igneous rock

Granite

Granite (Felsic Plutonic Rock)

Sandstone

Arenite (composed primarily of SiO2)

Amber

Succiniferous fossil resin (C10H16O)

Granite

Granite (Silicic Intrusive Igneous Rock)

Granite

Granite (a phaneritic intrusive igneous rock)

Banded Chert (River Stone)

Silicon Dioxide (SiO2)

Granite Pebble

Felsic intrusive igneous rock

Coquina / Fossiliferous Limestone

Calcareous bioclastic sedimentary rock (CaCO3)

Chert (Flint)

Microcrystalline quartz (SiO2)

Petoskey Stone

Hexagonaria percarinata (Fossilized Coral)

Granodiorite

Granodiorite

Granite

Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Granite

Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)

Sandstone (likely Quartzose Sandstone)

Arenite

Coquina (Fossiliferous Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Granodiorite

Granodiorite (Quartz + Plagioclase + Alkali Feldspar + Biotite/Hornblende)

Lapis Lazuli

Na8(Al6Si6O24)S2 (Lazurite is the primary constituent mineral)

Man-made Jewelry Charm (Enameled Metal)

Not a natural mineral; composed of base metal alloy (likely zinc or brass) and epoxy resin/enamel.

Cullet Glass (Man-made Glass Slag)

Amorphous Silica (SiO2) with chemical additives

Coquina

Bioclastic Limestone (Calcium Carbonate, CaCO3)

Amber

Succinite (fossilized tree resin)

Amber

Succinite (fossilized resin, C10H16O)

Man-made Green Quartz (Lab-grown or Treated)

Silicon Dioxide (SiO2) with artificial coloration

Granite

Phaneritic Felsic Intrusive Igneous Rock

Granite

Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Chert (or Flint)

Chert (cryptocrystalline quartz), SiO2

Granite

Granite (Felsic Plutonic Rock)

Granite (Pegmatitic)

Phaneritic Felsic Igneous Rock

Granite

Granitoid (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8 + SiO2)

Green Aventurine

Quartz (SiO2) with Fuchsite inclusions

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Basalt

Basalt (comprising Plagioclase feldspar, Pyroxene, and Olivine)

Smoky Quartz Cluster

Smoky Quartz (Silicon Dioxide - SiO2)

Desert Rose (Baryte or Gypsum Rose)

Baryte (BaSO4) or Gypsum (CaSO4·2H2O)

Chert (varietal Chalcedony or Flint)

Silicon dioxide (SiO2) - Microcrystalline Quartz