Organic Gemstone (Fossilized Resin)

Fossil Shark Tooth

Lamniform (Mackerel Shark) fossil tooth, likely Otodus or Cretalamna

Fossil oyster shell

Ostrea or Exogyra sp. (identification uncertain)

Turquoise and Red Coral

CuAl6(PO4)4(OH)8·4H2O (Turquoise) and Corallium rubrum (Red Coral)

Yellow chalcedony or citrine-like polished stone

Chalcedony (microcrystalline quartz, SiO₂), possibly dyed or artificially illuminated; exact identification is uncertain from the image

Pearl

Calcium carbonate (CaCO3) as Aragonite or Calcite

Pearl

Calcium Carbonate (Aragonite/Calcite) with Conchiolin, CaCO3

Blue-and-gold tiger’s-eye (likely heat-treated quartz)

Quartz, SiO₂, with crocidolite pseudomorphs; likely treated blue/gold tiger’s-eye

Blue quartzite or blue aventurine glass-like aggregate

Quartzite, predominantly SiO₂ (identification uncertain from image)

Pearl (in Marcasite Jewelry)

Biogenic Calcium Carbonate (primarily Aragonite, CaCO3)

Fossil Coral / Fossilized Coral

Scleractinia (Anthodiscus / Favia / Montastraea fossil)

Composite Turquoise or Reconstituted Turquoise with Copper inclusions

CuAl6(PO4)4(OH)8·4H2O (Turquoise) mixed with matrix and copper/bronze flakes

Polished ruby-in-fuchsite or crackle quartz specimen

Likely quartz (SiO₂) with red iron-oxide inclusions; exact identification requires testing

Black tourmaline (schorl) on quartz matrix

Schorl, NaFe3Al6(BO3)3Si6O18(OH)4, commonly associated with quartz (SiO2)

Fossil Brachiopod

Phylum Brachiopoda

Fossil scallop shell

Bivalvia, likely family Pectinidae; exact species cannot be determined from the image

Fossil Snail

Gastropoda (fossilized)

Fossil Snail

Gastropoda (fossilized)

Pearl

Calcium Carbonate (CaCO3) with Conchiolin

Dyed turquoise-like gemstone beads

Likely turquoise (hydrous copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O), possibly dyed howlite or magnesite

Coral Fossil (Petrified Coral)

Scleractinia (Order) - Calcified Fossil Skeleton (CaCO3)

Raw turquoise-bearing rock

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O, likely in a limonite/chalcedony host

Tahitian Pearl (Black / Pistachio Pearl)

Biogenic Aragonite / Calcite (CaCO3 with conchiolin)

Fossilized Coral

Anthozoa (Fossilized)

Pearl

Calcium Carbonate (Aragonite/Calcite) with Conchiolin

Turquoise

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

Turquoise

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

Megalodon Shark Tooth

Otodus megalodon

Fossil Shark Tooth (Sand Tiger Shark type)

Carcharias sp. (likely Odontaspis)

Carved yellow chalcedony (likely citrine-colored quartz or agate)

Microcrystalline quartz, SiO₂; chalcedony/agate variety, possibly heat-treated or dyed

Likely jade or green chalcedony cabochon

Possibly nephrite jade (actinolite–tremolite) or green chalcedony (microcrystalline quartz, SiO₂)

Precious Red Coral

Corallium rubrum (Calcium Carbonate, CaCO3)

Turquoise (possibly reconstituted or dyed howlite)

CuAl6(PO4)4(OH)8·4H2O (Hydrated Copper Aluminum Phosphate)

Chert (variably Oolitic or Fossiliferous)

Sedimentary Cryptocrystalline Quartz (SiO2)

Fossiliferous Brachiopod in Shale

Brachiopoda (Phylum) preserved in Carbonaceous Shale

Synthetic Resin Charm (Seal Shape)

Polymer Resin with plastic glitter / Polyethylene terephthalate glitters

Fossiliferous Limestone (with Oyster Fossils)

Fossiliferous Calcarenite / Bivalve Mollusk Fossil

Tree Agate

Chalcedony (SiO2)

Amazonite (Tumbled Chips)

Potassium Feldspar (KAlSi3O8)

Red jasper (likely polished and carved)

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

Yellow chalcedony (likely lemon agate or yellow jasper)

Microcrystalline quartz, SiO₂; possibly iron-bearing jasper or chrysoprase-like chalcedony

Fossilized Oyster in Flint

Gryphaea or Exogyra embedded in SiO2 (Flint/Chert)

Blue-green fluorite crystal

Fluorite (calcium fluoride, CaF₂)