Man Made Material (Jewelry, Metal Alloy)

Celestite (Celestine)

Strontium sulfate (SrSO4)

Slag (Industrial Glassy Byproduct)

Anthropogenic silicate byproduct (Slag)

Chintz

Microcrystalline Quartz (SiO2)

Turquoise inlay ring

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O

Diamond in a gold-tone setting

Diamond, crystalline carbon (C)

Likely smoky quartz cabochon ring

Quartz, silicon dioxide (SiO₂), probably smoky quartz; visual identification is uncertain because the stone is mounted and reflective

Slag (Industrial)

N/A (Anthropogenic Slag)

Red bead-and-chain costume jewelry, likely glass or plastic

No geological identification; the red beads appear manufactured and cannot be identified as mineral from the image

Diamond

Diamond (C)

Blue aventurine or dyed blue quartzite pendant

Quartz (SiO₂), likely aventurine quartz/quartzite; exact identification requires testing

Tumbled sea glass or pale-green quartz pebble

Indeterminate from image; possibly quartz (SiO₂), but the smooth translucent piece may be man-made glass

Faceted colorless gemstone, likely cubic zirconia or diamond

Cubic zirconia (zirconium dioxide, ZrO₂) or diamond (carbon, C)

Chert or Jasper

Microcrystalline Quartz (SiO2)

Limpets Shell / Fossil Specimen

Patellogastropoda (Class)

Blue-green agate bead bracelet

Chalcedony (microcrystalline quartz, SiO₂), likely dyed blue-green

Clear crystal-bead bracelet, possibly quartz

Unidentified transparent mineral beads; quartz (SiO₂) is one possibility

Diamond ring (likely clear cut gemstone)

Diamond, crystalline carbon (C)

Faceted blue gemstone, likely blue topaz or synthetic spinel

Topaz (Al₂SiO₄(F,OH)₂) or synthetic spinel (MgAl₂O₄); image insufficient for certainty

Red jasper bead bracelet

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

Unidentified metallic mineral or metal-like specimen

Indeterminate from image; possibly galena (PbS) or a metallic sulfide

Green cabochon gemstone pendant

Indeterminate; likely dyed green turquoise, chrysoprase, or opaque beryl set with blue/clear accent stones

Likely quartz cabochon in a ring

Quartz (SiO₂), possibly clear or milky quartz; identification is uncertain from the photograph

Blue glassy fragment among beach gravel

Likely cobalt-blue man-made glass; not a natural mineral specimen

Likely opal-inlay cross pendant

Opal (hydrated amorphous silica, SiO₂·nH₂O); central red stone is unidentified

Bismuth Crystal

Bismuth (Bi)

Turquoise-colored bead necklace (likely dyed howlite or magnesite)

Likely dyed Ca₂B₅SiO₉(OH)₅ (howlite) or MgCO₃ (magnesite); turquoise is CuAl₆(PO₄)₄(OH)₈·4H₂O

Small cylindrical mineral/stone fragment

Undetermined; the image is insufficient for reliable mineral identification

Tumbled black stone, likely black obsidian

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

White chalcedony (likely moonstone or milky quartz) earrings

Probably chalcedony, microcrystalline SiO₂; exact identification is uncertain from the image

Small metallic mineral grain, possibly native silver

Unconfirmed; native silver (Ag) is one possibility, but the photograph alone cannot distinguish it reliably from other metallic minerals or metal debris.

Amethyst cabochon jewelry

Amethyst, purple variety of quartz (SiO₂)

Amethyst chip or polished fragment

Quartz, purple variety (SiO₂), likely mounted or attached to metal

Clear quartz (likely)

Quartz, SiO₂

Chert (likely flint)

Microcrystalline quartz, SiO₂

Diamond jewelry pendant or cluster

Diamond, crystalline carbon (C), likely mounted in metal

Likely black cabochon gemstone pendant

Uncertain; possibly black star sapphire, black spinel, or obsidian

Slag (Industrial Glassy Byproduct)

Ferro-silicate Slag

Gemstone Ring

N/A - Set piece of jewelry, likely Amethyst or Garnet with Diamond or CZ

Andesite

Intermediate volcanic rock

Quartzite Pebble

Quartzite (SiO2)

Olivine

(Mg,Fe)2SiO4

Diamond

Carbon (C)