Man Made Object (Metalwork)

Diamond (Cut jewelry specimen)

Diamond (pure Carbon, C)

Ruby in Matrix

Corundum (Al2O3)

Coquina

Bioclastic Limestone

Likely slate

Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz

Fossil Sea Urchin (Echinoid)

Echinoidea fossil (often replaced by silica or calcite)

Fossil shell fragment

Indeterminate mollusk shell; likely gastropod or bivalve, composed mainly of calcium carbonate (aragonite/calcite)

Synthetic Convention Badge (Plastic/PVC)

Polyvinyl Chloride (PVC) / Polycarbonate

Diamond (Cut and Polished)

Diamond (pure Carbon, C)

Diamond

Carbon (C)

Rough Sapphire (Corundum)

Corundum (Al2O3)

Pumice

Pumice (Vitreous volcanic rock)

Chert (specifically Flint Arrowhead)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Polished smoky quartz point

Quartz, silicon dioxide (SiO₂), likely smoky variety

Tumbled sodalite with white calcite veining

Sodalite, Na8(Al6Si6O24)Cl2, commonly intergrown with calcite, CaCO3

Carnelian

Chalcedony (cryptocrystalline quartz), SiO2

Chert (Flint)

Silicon dioxide (SiO2)

Diamond (or Diamond Simulant)

Carbon (C) or Cubic Zirconia (ZrO2)

Seashell Fragment

Calcium carbonate (CaCO3) - primarily Aragonite or Calcite

Red garnet bead

Likely almandine–pyrope garnet, garnet-group silicate (approximately Fe₃Al₂Si₃O₁₂–Mg₃Al₂Si₃O₁₂)

Chert

Microcrystalline Quartz (SiO2)

Obsidian

Volcanic Glass (70% or more SiO2)

Pumice

Pumice (Vesicular volcanic glass)

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Amber (Copal)

Organic gemstone, fossilized tree resin (often immature amber or copal)

Diamond (Cut Gemstone)

Carbon (C)

Orange glassy slag (industrial by-product)

Iron-rich silicate glass; composition varies, commonly Fe–Ca–Al silicate

Gemstone ring (stones not reliably identifiable from the image)

Likely faceted yellow stones and clear stones set in a metal band; species and treatments are indeterminate visually

Granodiorite

Phaneritic Plutonic Intermediate-Felsic Rock

Brecciated jasper (likely red-and-cream jasper)

Jasper, an opaque microcrystalline variety of quartz; primarily cryptocrystalline SiO₂ with iron-oxide staining and possible chalcedony/quartz veining

Polished amethyst-bearing quartz

Quartz, SiO₂; purple coloration from irradiation and trace iron

Red cabochon gemstone ring (likely glass or synthetic stone)

Undetermined; the image does not establish a natural mineral identity

Diamond

Diamond (pure Carbon, C)

Diamond

Carbon (C)

Crinoid stem fossil

Crinoidea

Sandstone Concretion

Sedimentary concretion

Slate

Metamorphic Pelitic Rock

Blue Lace Agate

Chalcedony (SiO2) with trace inclusions

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide)

Uncertain light-colored stone on polished granite

Likely granite background; small specimen not confidently identifiable

Engineered Quartz Stone

Agglomerated Quartz (SiO2 + Polymer Resin)

Coquina

Bioclastic Limestone (composed primarily of CaCO3)

Sandstone

Arenite