Man Made Material (Metal)

Chintz

Microcrystalline Quartz (SiO2)

Red gemstone ring; likely synthetic ruby or red glass

Undetermined from the image; ruby is corundum (Al₂O₃), while red glass is amorphous silicate

Native Silver

Silver (Ag)

Possible basalt or industrial iron-rich slag

Basalt (plagioclase–pyroxene rock); identification uncertain from image

Rainbow Hematite (Man-made/Treated)

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

Unidentified metallic mineral or metal-like specimen

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

Gold

Native Gold (Au)

Blue glassy fragment among beach gravel

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

Clear faceted gemstone in an ornate metal bracelet

Unidentified transparent faceted stone; possibilities include quartz (SiO₂), zircon (ZrSiO₄), or glass—image alone cannot distinguish them

Aventurine

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

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)

Chert (likely flint)

Microcrystalline quartz, SiO₂

Mounted clear gemstone, likely cubic zirconia

Cubic zirconia (zirconium dioxide, ZrO₂), synthetic; exact stone cannot be confirmed from the image

Pavé-set diamond ring

Diamond (crystalline carbon, C)

Slag (Industrial Glassy Byproduct)

Ferro-silicate Slag

Quartzite Pebble

Quartzite (SiO2)

Olivine

(Mg,Fe)2SiO4

Green Agate

Silicon dioxide (SiO₂)

Pallasite Meteorite

Pallasite (Stony-Iron Meteorite)

Tumbled black obsidian (likely)

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

Asphalt Pavement (with aggregate)

Asphalt concrete

Slag Glass (Leland Blue variant)

Anthropogenic Vitreous Silicate

Faceted clear gemstone ring

Likely colorless quartz (SiO₂); the photo does not establish the stone’s identity

Colorless faceted gemstone, likely a diamond in a ring setting

Diamond (carbon, C); identification from the image is uncertain

Coquina

Bioclastic Limestone

Slag

Libyan Desert Glass

Impact-melt silica glass (SiO2 + traces of Al, Fe, Ti)

Red agate-style bead earring

Likely dyed chalcedony (microcrystalline quartz, SiO₂); exact material cannot be confirmed visually

Black onyx-style gemstone ring

Likely chalcedony (microcrystalline quartz, SiO₂), possibly dyed black; identification from the photo is uncertain

Polished serpentine pendulum

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

Gemstone-set ring, likely cubic zirconia or diamond

Likely synthetic cubic zirconia (zirconium dioxide, ZrO₂); stones may alternatively be diamond (carbon, C)

Note on Image Identification: Textile

N/A (Anthropogenic material)

Goldstone and Aura Quartz

Cuprous Glass (Goldstone) and Titanium-coated SiO2 (Aura Quartz)

Clear gemstone earring (likely cubic zirconia)

Cubic zirconia (synthetic zirconium dioxide, ZrO₂); identification from the image is uncertain

Diamond-set gold ring

Diamond (crystalline carbon, C) set in a gold alloy; the metal and setting are manufactured

Flint

Microcrystalline Quartz (SiO2)

Coquina

Bioclastic Limestone

Faceted brown gemstone ring, likely smoky quartz

Smoky quartz (SiO₂), identification uncertain from the image

Tumbled aqua glassy mineral specimen, likely chrysocolla or turquoise imitation

Uncertain from image; possible chrysocolla (hydrated copper aluminosilicate, variable composition) or dyed/man-made glass

Faience and Carnelian in Egyptian Revival Jewelry

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

Dyed Crackle Quartz

Silicon Dioxide (SiO2) with synthetic dye