Not A Rock (Man Made Industrial Metal)

Quartzite

Silica (SiO2)

Native Silver

Silver (Ag)

Likely weathered iron-rich rock or slag fragment

Uncertain; possibly limonite/goethite-rich material (FeO(OH)·nH₂O)

Possible iron meteorite

Iron meteorite, likely kamacite–taenite alloy

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Quartzite

Metamorphic Quartz Sandstone

Polished carnelian agate pendant

Microcrystalline quartz (SiO₂), orange chalcedony; likely banded agate

Bauxite

Aluminium ore / Hydrated aluminium oxides (AlOx(OH)3-2x)

Slag (Anthropogenic Glass/Iron byproduct)

Ferro-silicate Slag

Standing Liberty Quarter (Silver Specimen)

Native Silver alloy (Ag with Cu traces)

Green agate/chalcedony bead necklace

Microcrystalline quartz (SiO₂), likely green chalcedony or dyed green agate

Green glassy mineral fragment, possibly fluorite

Fluorite (calcium fluoride, CaF₂), tentative identification

Tumbled ruby-in-zoisite (likely)

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

Iron Slag

Ferrous slag (primarily silicates and oxides of calcium, iron, and magnesium)

Chert with Limestone

Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3) Matrix

Cut faceted gemstone, possibly diamond or quartz

Uncertain from the blurred image; diamond is crystalline carbon (C), while quartz is silicon dioxide (SiO₂)

Heart-shaped faceted gemstone pendant

Likely yellow quartz (citrine) or synthetic yellow stone, set in metal with small clear accent stones

Aventurine

Quartz containing inclusions of Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Tumbled black stone, likely black obsidian

Obsidian; volcanic glass, typically rhyolitic composition (SiO₂-rich)

Native Copper

Native Copper (Cu)

Small stud earring with a purple gemstone (possibly amethyst)

Possible amethyst, a purple variety of quartz (SiO₂); identification is uncertain from the image

Sandstone (Red/Brown Variety)

Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)

Glass Nugget (Tumbled Glass)

Amorphous Silicon Dioxide (SiO2) with additives

Silver (Jewelry Specimen)

Native Silver (Chemical Formula: Ag)

Rainbow Hematite (Man-made/Treated)

Tumbled Hematite with Titanium/Anodized coating (Iron(III) oxide, Fe2O3)

Glass / Silicon Dioxide (Man-made)

SiO2 (Amorphous Silicon Dioxide)

Coal (Anthracite / Bituminous)

Organic Sedimentary Rock (Carbon-based)

Silicon

Element Si

Granite (weathered pebble)

Granite (plutonic igneous rock)

Quartzite Pebble

Metamorphic Quartzite (primarily SiO2)

Blue chalcedony bead necklace

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

Botryoidal chalcedony with quartz vug

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

Quartzite

Quartzite (SiO2)

Milky Quartz Vein in Mafic Rock

Quartzite vein in Metabasalt (SiO2 base)

Iron meteorite (probable)

Fe–Ni metal, typically kamacite and taenite

Man-made Crystal (Lead Glass)

Lead oxide-doped Silica Glass (approx. SiO2 + PbO)

Likely metallic meteorite fragment

Undetermined iron meteorite, possibly an iron–nickel alloy (kamacite/taenite)

Slag Glass (Leland Blue variant)

Anthropogenic Vitreous Silicate

Iron-stained quartz-rich breccia (likely weathered vein rock)

Quartz-rich hydrothermal breccia with limonite/goethite; possibly iron-bearing jasper or silicified volcanic rock

Engineered Quartz Stone

Agglomerated Quartz (SiO2 + Polymer Resin)

Tumbled black obsidian (likely)

Volcanic glass; chiefly silica-rich rhyolitic glass (SiO₂)

Quartzite

Quartzite (SiO2)