Man Made Object (Ring)

Petrified Wood

Silicified Wood (primarily Chalcedony or Quartz, SiO2)

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Carnelian Agate

Silicon Dioxide (SiO2)

Red Garnet

Pyrope or Almandine (Silicate group, X3Y2(SiO4)3)

Carnelian Agate

Silicon dioxide (SiO2) - Chalcedony variety

Carnelian Agate

Silicon Dioxide (SiO2)

Carnelian

Chalcedony (SiO2) with Iron Oxide impurities

Black Onyx

Silicon Dioxide (SiO2)

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock

Granite

Granite (a phaneritic intrusive igneous rock consisting mainly of quartz, alkali feldspar, and plagioclase)

Optical Calcite

Calcium Carbonate (CaCO3)

Optical Calcite (Iceland Spar)

Calcium Carbonate (CaCO3)

Dyed Quartz (imitating Emerald/Green Quartz)

Silicon Dioxide (SiO2) with artificial pigment

Gold

Native Gold (Au)

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

Dolerite (Diabase)

Dolerite / Diabase

Coral Rock (Coquina)

Biogenic Limestone (Calcium Carbonate - CaCO3)

Chert (and/or Flint)

Chert (Cryptocrystalline variety of Quartz, SiO2)

Calcite

Calcium Carbonate (CaCO3)

Calcite

Calcium Carbonate (CaCO3)

Slate

Slate (a fine-grained, foliated metamorphic rock). Mineral composition: Primarily composed of mica minerals (muscovite, chlorite, sericite) and quartz, with minor amounts of hematite, pyrite, and other accessory minerals.

Chert (variations include Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Petrified Wood

Silicified wood (Quartz variant, SiO2)

Jadeite Jade

NaAlSi2O6 (Sodium Aluminum Silicate)

Coquina

Coquina (Bioclastic Limestone)

Chalcedony (variations like Agate or Jasper)

Chalcedony (SiO₂ - microcrystalline quartz)

Green Aventurine (likely)

Silicon dioxide (SiO2) with fuchsitemica inclusions

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Howlite (Tumbled)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Green Aventurine

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Jasper (specifically Fancy or Polychrome Jasper)

Silicon Dioxide (SiO2) - Chalcedony

Carnelian

Carnelian (a variety of Chalcedony, SiO2)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Jasper (Red Jasper)

Jasper (SiO2 - Silicon Dioxide with iron inclusions)

Orange Calcite

Calcium Carbonate (CaCO3)

Malachite

Malachite (Copper Carbonate Hydroxide, Cu2CO3(OH)2)

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide and clay inclusions

Sandstone (Banded)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Black Pearl (Tahitian-style Cultured Pearl)

Calcium Carbonate (Aragonite) with Conchiolin (CaCO3)

Banded Sandstone (Zebra Stone)

Arenite with Iron Oxide Banding (Liesegang rings)

Malachite

Malachite (Copper Carbonate Hydroxide) - Cu2CO3(OH)2