Mineral (Man Enhanced)

Tumbled agate (likely moss or dendritic agate)

Microcrystalline quartz, chiefly chalcedony (SiO₂), with iron-oxide and possible manganese inclusions

Metal Chain Belt with Square Plates

Not applicable (man-made)

Diamond (in a jewelry setting)

Diamond (Carbon, C)

Tumbled black stone, likely black obsidian

Obsidian (volcanic glass; chiefly silica-rich rhyolitic composition)

Red Granite

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

Tumbled gray-blue agate/chalcedony

Microcrystalline quartz (SiO₂), likely banded chalcedony or agate

Polished pink-and-gray agate/chalcedony pebble

Microcrystalline quartz (SiO₂), likely agate with iron-oxide coloration

Banded agate (likely quartz-rich chalcedony)

Microcrystalline quartz, SiO₂; possibly agate with a weathered iron-rich host rock

Sandstone Concretion

Limonitic Sandstone Concretion

Asphalt (Road Aggregate)

Asphalt concrete / Bituminous mixture

Fossilized bone fragment

Petrified bone, mineral-replaced vertebrate bone; exact taxon indeterminate

Agate Bookend / Quartz Geode

Silicon Dioxide (SiO2)

Synthetic Resin Charm (Seal Shape)

Polymer Resin with plastic glitter / Polyethylene terephthalate glitters

Polished green agate (likely dyed)

Chalcedony, microcrystalline SiO₂; agate variety

Opalite

Synthetic glass / Opaque silicious glass

Polished, dyed blue agate slice

Agate, a banded variety of chalcedony (microcrystalline SiO₂)

Diamond (or Cubic Zirconia simulant)

Carbon (C) - Diamond / Zirconium dioxide (ZrO2) - CZ

Polished dendritic agate (likely moss or plume agate)

Microcrystalline quartz, SiO₂, with iron-oxide inclusions

Bornite

Bornite (Cu5FeS4)

Polished orbicular jasper

Jasper, microcrystalline quartz (SiO₂), with iron oxides and altered volcanic inclusions

Aquamarine

Beryl (Be3Al2Si6O18)

Granitoid Pebble (Graphic Granite/Pegmatite)

Pegmatitic Granite with Quartz and Orthoclase

Black Onyx

Cryptocrystalline Quartz (SiO2)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Asphalt Concrete (Bituminous Pavement)

Aggregates in Bitumen Matrix

Aluminum Slag

Anthropogenic Aluminum (Al)

Polished ocean jasper / orbicular jasper (probable)

Silica-rich chalcedony (microcrystalline quartz, SiO₂) with iron oxides and altered volcanic inclusions

Polished fossil bone fragment

Fossilized bone, likely mammalian or reptilian; exact taxon cannot be determined from the image

Carnelian (Tumbled)

Carnelian (variety of Chalcedony, SiO2)

Dyed Agate

SiO2

Tumbled amber-colored chalcedony (likely carnelian or jasper)

Microcrystalline quartz, SiO₂; iron-bearing variety

Orange Calcite

Calcium Carbonate (CaCO3)

Carnelian Agate

Silicon Dioxide (SiO2) - Variety of Chalcedony

Agate (Carnelian Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Carnelian

SiO2 (Chalcedony with iron oxide impurities)

Peacock ore (likely chalcopyrite-bornite specimens)

Iridescent chalcopyrite, CuFeS₂, commonly altered to bornite, Cu₅FeS₄

Polished blue glassy mineral specimen, likely sodalite or blue aventurine

Most consistent with sodalite (Na₈Al₆Si₆O₂₄Cl₂), though dyed quartzite or blue glass cannot be excluded from the photograph

Cubic Zirconia (Jewelry Setting)

Zirconium Dioxide (ZrO2)

Rough Corundum (Sapphire/Ruby mixture)

Corundum (Aluminum Oxide, Al2O3)

Blue glassy gemstone-like specimen

Indeterminate; possibly dyed or treated turquoise, blue apatite, or man-made glass

Tumbled banded agate

Chalcedony (microcrystalline quartz), SiO₂

Aura Quartz (Cranberry or Magenta Aura Quartz)

Silicon dioxide coated with titanium/niobium (SiO2)