Mineraloid (Man Made Glass)

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)

Polished serpentine pendulum

Serpentine-group minerals, chiefly antigorite/lizardite; approximate formula Mg₃Si₂O₅(OH)₄

Granodiorite with Quartz Veining

Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins

Pink Marble

Recrystallized Limestone (Calcium Carbonate, CaCO3)

Fossil Shark Tooth

Carcharocles or Lamniformes (order)

Fossiliferous Limestone (Coquina)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Native Silver

Silver (Ag)

Pyrite

Iron Sulfide (FeS2)

Polished amber

Amber (fossilized plant resin), commonly succinite; organic mineraloid rather than a true mineral

Crackled Quartz (Blue Dyed)

Silicon Dioxide (SiO2) with anthropogenic dye

Chert Arrowhead (Lithic Tool)

Microcrystalline quartz (SiO2) - Archeological lithic artifact

Pearl (with Peridot)

Calcium carbonate (CaCO3) + Conchiolin; Peridot: Magnesium iron silicate (Mg, Fe)2SiO4

Chalk

CaCO3 (primarily Calcium Carbonate), biogenic sedimentary rock

Basalt

Basalt

Common Marble

Calcium Carbonate (CaCO3)

Mother of Pearl (Nacre)

Calcium Carbonate (primarily aragonite, with conchiolin)

Turquoise

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

Marble

Recrystallized Calcite (CaCO3)

Rough Diamond

Diamond (Pure Carbon: C)

Diamond

Carbon (C)

White Marble

Metamorphic Limestone (CaCO3)

Pyrite

Iron Disulfide (FeS2)

Lapis Lazuli

Lapis Lazuli (a rock type, not a single mineral, composed primarily of lazurite, calcite, and pyrite)

White Marble

Recrystallized Calcite (CaCO3)

Orange cabochon gemstone, likely amber or amber-like resin

Natural amber: fossilized plant resin (organic mineraloid), commonly succinite; exact identification requires testing

Chalcanthite (Likely Synthetic/Lab-Grown)

Hydrated copper(II) sulfate (CuSO4·5H2O)

Dyed Quartz (often sold as 'Blue Quartz' or 'Blue Agate')

Silicon Dioxide (SiO2) with artificial pigment

Carnelian

Chalcedony (cryptocrystalline quartz), SiO2

Granite

Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).

Granite

Granite (felsic intrusive igneous rock)

Diamond

Carbon (C)

Crushed Limestone

Calcium Carbonate (CaCO3)

Red Coral

Corallium rubrum (Calcium Carbonate, CaCO3 with Carotenoid pigments)

Iron Slag

Ferrous Slag (Industrial Byproduct)

Shell Cameo

Cypraecassis rufa (Bullmouth Queen Helmet Shell)

Aventurine (likely Green Aventurine)

Silicon Dioxide (SiO2) with mineral inclusions

Marble

Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.

Fossilized Stingray Mouth Plate

Myliobatidae gen. et sp. indet. (e.g., Myliobatis, Aetobatus)

Petoskey Stone

Hexagonaria percarinata

Pyrite

Iron Disulfide (FeS2)

Asphalt (Bituminous Concrete)

Bituminous mix / Anthropogenic conglomerate

Metal Alloy (Jewelry)

Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.