Anthropogenic Specimen (Man Made Material)

Unknown dark mineral/rock fragment

Indeterminate; possibly a dark sulfide mineral or slag-like geological fragment

Chert (Arrowhead/Artifact Fragment)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Likely banded obsidian or dark volcanic glass

Obsidian, predominantly rhyolitic volcanic glass (SiO₂-rich), possibly with devitrified bands and phenocrysts

Polished yellow-green serpentine pendant

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

Decorative gemstone bracelet or jewelry

Unidentifiable from the blurred image; likely colored glass or synthetic stones, possibly mixed gemstone beads

Faience and Carnelian in Egyptian Revival Jewelry

Faience (quartz frit) and Carnelian (chalcedony, SiO2)

Chert (possibly a worked stone flake)

Microcrystalline quartz, SiO₂

Amber cabochon pendant

Amber (fossilized plant resin), chiefly polymerized diterpenoid resin

Blue Goldstone

Synthetic glass with copper or cobalt/manganese inclusions

Weathered chert or chalcedony nodule

Microcrystalline quartz (SiO₂), possibly silicified limestone or agate-like chalcedony

Tumbled epidote-bearing rock (likely epidote–quartz–feldspar aggregate)

Epidote-rich metamorphic rock; minerals likely epidote (Ca₂(Al,Fe)₃Si₃O₁₂(OH), quartz, feldspar, and dark amphibole/biotite)

Chert (Arrowhead artifact)

Chert (Cryptocrystalline Silica, SiO2)

Note: Item is a Synthetic/Man-made Object

Titanium-coated Stainless Steel (Fe-Cr-Ni-Ti)

Diamond

Carbon (C)

Sea Glass (Frosted Glass)

Amorphous Silica (SiO2) with various additives

Tourmalinated quartz point

Quartz (SiO₂) with black tourmaline (schorl, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄) inclusions

Likely gold-colored metal ring with a possible gemstone

Uncertain; possibly gold alloy (Au) with a small quartz or glass-like setting

Iron Slag

Anthropogenic pyrometallurgical byproduct

Polished black stone pendant

Likely black obsidian or black tourmaline; exact identification is uncertain from the photograph

Corundum (Pink Sapphire / Ruby)

Al2O3 (Aluminum Oxide)

Tumbled greenstone (likely serpentinite or green jasper)

Serpentinite, commonly dominated by serpentine-group minerals (Mg₃Si₂O₅(OH)₄); exact identification requires testing

Dark rounded pebble, likely basalt or slag

Probable fine-grained mafic rock; possibly basalt (plagioclase–pyroxene) or industrial iron/steel slag

Ferrous Slag (Iron Smelting By-product)

Fused Siliceous Slag

Milky quartz pebble

Quartz, silicon dioxide (SiO₂)

Tumbled ruby-in-zoisite (likely)

Ruby-bearing zoisite; zoisite Ca₂Al₃(SiO₄)₃(OH), corundum ruby Al₂O₃

Galena (lead sulfide)

Galena, PbS

Flint (chert)

Microcrystalline quartz (SiO₂), commonly called chert or flint

Diorite (River Pebble)

Intermediate Phaneritic Igneous Rock

Chert (and/or Flint)

Chert (Cryptocrystalline variety of Quartz, SiO2)

Petrified Wood (Silicified Wood)

Silicified Paleoflora (mainly Quartz, SiO2)

Tree Agate

Chalcedony (SiO2)

Pearl necklace

Pearl, primarily aragonite (CaCO₃) and conchiolin

Likely slate

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

Cardstock (Paper)

Cellulose (C6H10O5)n

Ferrochrome Slag

Industrial Glassy Slag (Fe-Cr alloy byproduct)

Chert Arrowhead (Lithic Artifact)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Silicon dioxide (SiO2)

Banded Sandstone

Arenite with Liesegang banding

White cabochon gemstone, likely milky chalcedony or opalite

Chalcedony: microcrystalline quartz, SiO₂; appearance may also indicate synthetic opalite glass

Likely iron-rich rock or weathered metallic mineral fragment

Uncertain; possibly limonite/goethite or iron-bearing slag

Hematite Beads

Hematite (Fe2O3)

Green sea glass or green glass-like tumbled material

Amorphous silicate glass; likely anthropogenic soda-lime glass, not a natural mineral