Mineraloid (Human Made Geological Specimen)

Multicolored beryl gemstone bracelet

Beryl, Be₃Al₂Si₆O₁₈; likely mixed aquamarine, morganite, heliodor, and green beryl beads

Fossilized Burrow

Trace fossil (Ichnogenus)

Green Slag

Anthropogenic Silicate Glass

Colorless faceted gemstone, likely glass or cubic zirconia

Uncertain; possible cubic zirconia (ZrO₂) or quartz (SiO₂), but the image may show a man-made simulant

Polished orbicular jasper (likely ocean jasper)

Siliceous microcrystalline quartz/chalcedony with iron-oxide and volcanic inclusions; commonly called ocean jasper

Limonite Concretion

Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Tumbled quartz or calcite specimen

Quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing

Precious Coral (Red Coral)

Corallium rubrum (Calcium Carbonate, CaCO3)

Colorless faceted gemstone, likely glass or quartz

Uncertain; possibly quartz (SiO₂), but the strong uniform brilliance and apparent molded/faceted form may indicate leaded glass or cubic zirconia

Goldstone and Aura Quartz

Cuprous Glass (Goldstone) and Titanium-coated SiO2 (Aura Quartz)

Pearl-embellished decorative cross

Pearl (biogenic calcium carbonate, predominantly aragonite) with rhinestone-mounted glass or synthetic gemstones

Likely iron-rich slag or weathered ironstone fragment

Uncertain; possibly iron oxide–rich material (hematite/goethite) or industrial iron slag

Likely iron-rich slag or dark ironstone

Indeterminate from photograph; possibly iron-rich industrial slag (Fe–Si–O glass/oxides) or ironstone

Chert (or Flint)

Chert (a cryptocrystalline variety of quartz, SiO2)

Polished dark gemstone, likely hematite or magnetite

Hematite (Fe₂O₃) or magnetite (Fe₃O₄); exact identification requires testing

Diamond ring

Diamond (crystalline carbon, C) set in a metal ring; the small stones appear diamond-like but cannot be confirmed from the image.

Asphalt (Road Aggregate)

Bituminous Conglomerate / Asphalt Concrete

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (Flint)

Silicon dioxide (SiO2)

Faceted gemstone pendant, likely quartz or citrine

Indeterminate from photograph; likely quartz (SiO₂), possibly yellow citrine or treated quartz

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

Silicon Dioxide (SiO2) with artificial pigment

Concrete fragment or Conglomerate

Artificial Conglomerate (Concrete) or Natural Conglomerate

Chert / Flint Tool

Cryptocrystalline quartz (SiO2)

Chert or Jasper

Microcrystalline Quartz (SiO2)

Exposed Aggregate Concrete (Pea Gravel)

Concrete with Siliceous Alluvial Gravels

Flint

SiO2 (Cryptocrystalline Quartz)

Polished yellow-brown stone, possibly jasper

Undetermined; potentially microcrystalline quartz (SiO₂) jasper

Flint

Cryptocrystalline quartz (SiO2)

Polished peach aventurine or quartz

Likely quartz (SiO₂), possibly feldspar-rich aventurine

Likely muscovite mica

Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂

Diamond ring

Diamond, crystalline carbon (C), set in a gold-colored metal ring

Sea Glass

Amorphous silicon dioxide (SiO2) - Man-made glass tumbled by nature

Gold (Elemental Metal)

Gold (Au)

Goldstone

Aventurine Glass (Man-made)

Polished mahogany obsidian (probable)

Volcanic glass; chiefly rhyolitic silica-rich glass (SiO₂), compositionally near rhyolite

Opalite

Man-made Glass (Synthetic Opalized Glass)

Chert (varieties include Flint and Jasper)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Tumbled cream-colored pebble

Likely quartz-rich sandstone or limestone; exact identification requires testing

Painted Pet Rock (Quartzite/Sandstone base)

Silicon Dioxide (SiO2) with anthropomorphic acrylic embellishments

Pearl

Calcium Carbonate (mostly Aragonite), CaCO3 (with conchiolin)

Chert (specifically a Lithic Flake)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz