Mineral (Man Made Glass)

Kyanite

Aluminium Silicate, Al2SiO5

Small rounded pebble (rock type indeterminate)

Unidentified fine-grained lithic pebble

Amethyst (or Light Amethyst / Rose Quartz)

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Red jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored chiefly by iron oxides

Carved labradorite fish

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

Diamond (as set in a gold ring)

Carbon (C)

Turquoise

Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O

Red agate bead (likely dyed or treated)

Agate, a microcrystalline variety of quartz; SiO₂

Green Aura Quartz

Silicon Dioxide (SiO2) bonded with metallic vapors (typically Gold, Chromium, or Titanium)

Sandstone (likely Fossiliferous)

Arenite / Fossiliferous Sandstone (SiO2 composition)

Green obsidian (likely moldavite)

Natural volcanic glass; if extraterrestrial-impact glass, moldavite (tektite)

Chert (and/or Flint)

Microcrystalline Quartz (SiO2)

Possible ironstone concretion or weathered mineral nodule

Iron-oxide-rich concretion, likely goethite/limonite; identification uncertain from the photo

Blue Quartz (Aventurine)

Silicon Dioxide (SiO2) with fibrous inclusions (commonly Dumortierite)

Milky quartz

Quartz, silicon dioxide (SiO₂)

Amethyst

Silicon Dioxide (SiO2) with Fe3+ impurities

Chert

Chert (Microcrystalline Quartz)

Colorless faceted gemstone, likely quartz

Quartz (SiO₂), tentative identification; the photo is insufficient to confirm the material

Red cabochon gemstone ring (likely ruby or red spinel; identity unconfirmed)

Possibly corundum (ruby, Al₂O₃) or spinel (MgAl₂O₄); visual identification alone cannot distinguish these from glass or synthetic stones.

Tumbled purple quartz, likely amethyst or lavender quartz

Quartz (SiO₂), probably iron-colored amethyst; exact variety uncertain from the image

Smoky Quartz

Smoky Quartz (Silicon Dioxide, SiO2)

Polished black stone sphere, likely obsidian

Obsidian — naturally occurring volcanic glass, chiefly silica-rich rhyolitic glass

Diamond (in a cluster setting)

Crystallized Carbon (C)

Green Glass Cullet / Recycled Glass

Amorphous Silicon Dioxide (SiO2) with various metal oxides

Chert or Jasper

Microcrystalline Quartz (SiO2)

Black tourmaline bead bracelet, possibly mixed with smoky quartz or brown tourmaline

Schorl tourmaline, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄; exact beads cannot be confirmed visually

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Amethyst Cluster

Silicon Dioxide with Iron impurities (SiO2)

Likely muscovite mica

Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂

Flint

SiO2 (Cryptocrystalline Quartz)

Botryoidal chalcedony with quartz vug

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

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide)

Tumbled chalcedony (likely agate or jasper fragment)

Microcrystalline quartz, SiO₂ (chalcedony)

Natural or Cultured Pearl

Calcium Carbonate (Aragonite and Conchiolin), CaCO3

Polished carnelian agate

Microcrystalline quartz (SiO₂), chalcedony variety; orange-red color commonly from iron oxides

Polished jasper pebble

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with possible iron-oxide and other mineral inclusions

Weathered concrete or cementitious slab (not natural rock)

Artificial calcium-silicate cement composite; likely Portland cement concrete

Red cabochon gemstone ring

The stone may be carnelian (orange-red chalcedony, SiO₂); the image is insufficient to identify it reliably.

Diamond

Diamond (pure native carbon, C)

Chert (Flint / Quartz Nodule)

Microcrystalline Quartz (SiO2)

Diamond Druzy (Crystalline Diamond)

Carbon (C)