Man Made Object (Metalwork)

Chalcedony / milky quartz flake

Microcrystalline quartz (SiO₂), likely chalcedony; possibly a worked quartzite or chert fragment

Polished smoky quartz crystal point

Quartz (SiO₂), likely iron-colored or smoky quartz with milky inclusions

Tumbled brown chalcedony or agate

Microcrystalline quartz (SiO₂), likely chalcedony; possibly iron-stained jasper or agate

Gray rock (possibly basalt or fine-grained granite)

Undetermined; no diagnostic minerals are visible

Polished jasper pendant

Jasper, microcrystalline quartz (SiO₂) with iron-oxide and other mineral inclusions

Polished banded agate pendant

Agate, a microcrystalline variety of chalcedony (SiO₂)

Man-made Green Quartz (Lab-grown or Treated)

Silicon Dioxide (SiO2) with artificial coloration

Soapstone Carving

Steatite

Chert (likely jasper/chalcedony-rich chert)

Microcrystalline quartz, SiO₂

Polished red jasper beads

Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides

Polished agate bead bracelet

Agate, a banded microcrystalline variety of quartz (SiO₂), likely mixed-color dyed or naturally colored chalcedony

Small clear crystal, possibly quartz or glass-like gemstone

Uncertain; likely quartz (SiO₂), but the image is insufficient to exclude man-made glass or cubic zirconia

Polished black stone carving, likely soapstone/steatite

Steatite (massive talc), Mg₃Si₄O₁₀(OH)₂; exact material cannot be confirmed from the image

Clear Quartz (Faceted)

Silicon Dioxide (SiO2)

Yellow cabochon gemstone, likely citrine or yellow glass imitation

Quartz (SiO₂), if natural citrine; visual evidence is insufficient to exclude man-made glass or resin

Polished green-and-black banded cabochon (likely malachite imitation or dyed agate)

Uncertain; possible malachite (Cu₂CO₃(OH)₂), banded agate (SiO₂), or man-made glass

Polished blue-green glassy slag or coated mineral fragment

Most likely man-made colored glass/slag; exact composition cannot be determined visually

Blue goldstone beads

Man-made aventurine glass (silica glass with metallic copper inclusions), not natural lapis lazuli

Blue chalcedony bead necklace

Chalcedony, microcrystalline quartz (SiO₂), commonly blue-dyed or blue-gray natural chalcedony

Pearl

Calcium Carbonate (Aragonite/Calcite) with Conchiolin

Likely rough pink feldspar or rose quartz

Most likely microcline feldspar (KAlSi₃O₈) or rose quartz (SiO₂)

Polished black obsidian

Volcanic glass; primarily rhyolitic SiO₂, with minor iron, magnesium, and other trace elements

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

Colorless faceted quartz-like gemstone

Likely quartz (SiO₂), though the appearance may also indicate man-made glass or cubic zirconia

Botryoidal chalcedony with quartz vug

Microcrystalline quartz, SiO₂ (chalcedony), with a drusy quartz-lined cavity

Terrazzo (with Marble and Granite fragments)

Cementitious or resinous composite containing Calcium Carbonate (CaCO3) and Silicates

Tumbled purple chalcedony or low-grade amethyst bead bracelet

Chalcedony (microcrystalline SiO₂), possibly quartz/amethyst; composition is SiO₂

Likely polished dark gemstone cabochon

Indeterminate; possibly black chalcedony/agate, obsidian, or glass imitation

Fossilized bivalve shell

Bivalvia indeterminate; likely a fossil clam or cockle

Red Jasper Cube

SiO2 (microcrystalline quartz)

Worn River Pebble with Fossil Indentation

Sedimentary Rock with Fossil Infill

Red-and-brown agate bead bracelet

Agate, a microcrystalline variety of quartz (SiO₂), likely colored chalcedony/carnelian

Goldstone (blue-goldstone–style glass) beads

Artificial aventurine glass, typically silica glass with copper inclusions; not a natural mineral

River Pebble (likely Quartzite or Chert)

Sedimentary Clast (Silicon Dioxide dominant)

Blue calcite sphere

Calcite (CaCO₃), commonly blue-calcite variety

Fossilized shell or coral fragment

Indeterminate biogenic carbonate; likely calcite/aragonite (CaCO₃)

Stone bead bracelet

Unidentified polished natural-stone beads; possibly wood-grain jasper, agate, or serpentine

Flint or chert, possibly a knapped stone tool

Microcrystalline quartz (SiO₂), commonly chalcedony with possible carbonaceous impurities

Unable to identify - Image contains non-geological items

Likely iron-rich concretion or weathered rock pebble

Uncertain from the image; possibly an iron-oxide-cemented concretion (goethite/hematite)

Carved labradorite fish

Labradorite, calcium-rich plagioclase feldspar (approximately (Ca,Na)(Al,Si)₄O₈)

Painted River Rock (likely Quartzite or Granite)

Quartzite or Granitic Gneiss (painted)