Not A Rock (Man Made Industrial Metal)

Polished white chalcedony or quartz pendant

Microcrystalline quartz (chalcedony), SiO₂; exact identification is uncertain from the image

Polished yellow-green serpentine pendant

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

Polished black stone, likely obsidian

Obsidian (volcanic glass; mostly silica-rich rhyolitic composition)

Terrazzo (with Marble and Granite fragments)

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

Likely gold-colored metal ring with a possible gemstone

Uncertain; possibly gold alloy (Au) with a small quartz or glass-like setting

Opal ring (likely precious opal)

Hydrated amorphous silica, SiO₂·nH₂O; the pictured stone may be natural opal or a lab-created/imitation opal

Diamond (or Cubic Zirconia simulant)

Carbon (C) - Diamond / Zirconium dioxide (ZrO2) - CZ

Quartz vein in Host Rock

Crystalline Silicon Dioxide (SiO2) in Lithic Matrix

Slag (Industrial Byproduct)

Anthropogenic Vitreous Silicate material

Green sea glass or tumbled green quartz (uncertain)

Likely quartz (SiO₂) if natural; alternatively man-made soda-lime glass

Aura Quartz

Titanium/Titanium-Gold treated Silicon Dioxide (SiO2)

Small dark rock fragment

Uncertain; possibly weathered basalt or slag

Granitic Pegmatite

Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8, Mica: KAl2(AlSi3O10)(OH)2)

Red gemstone ring, likely garnet or synthetic ruby

Possibly almandine garnet (Fe₃Al₂(SiO₄)₃) or corundum/ruby (Al₂O₃); image alone cannot distinguish

Botryoidal chalcedony with iron-oxide staining

Microcrystalline quartz (SiO₂), likely iron-oxide-bearing chalcedony

Blue faceted gemstone ring, likely synthetic sapphire or blue topaz

Uncertain from image; possible corundum (Al₂O₃) or topaz (Al₂SiO₄(F,OH)₂)

Likely golden mica-bearing metamorphic rock

Micaceous schist, possibly biotite schist; composition commonly quartz + feldspar + biotite/phlogopite mica

Polished white calcite sphere (identification tentative)

Calcite, CaCO₃

Rounded greenish-gold rock or mineral pebble

Indeterminate; possibly serpentine-rich stone, weathered sulfide, or iron-stained metamorphic rock

Blue gemstone cross pendant

Likely faceted blue topaz (Al₂SiO₄(F,OH)₂); identification is uncertain from the image

Quartzite

Metamorphic rock primarily composed of Quartz (SiO2)

Botryoidal chalcedony (likely agate/jasper variety)

Microcrystalline quartz, SiO₂

Quartz-rich breccia or quartz vein fragment

Silica, primarily quartz (SiO₂), with possible chlorite, feldspar, or iron-oxide inclusions

Weathered quartz-rich nodule, possibly agate or chalcedony

Microcrystalline quartz (SiO₂), potentially with iron-oxide staining or a druzy coating

Opalite

Synthetic Opalised Glass

Diamond

Carbon (C)

Quartzite

Quartzite (SiO2)

Red Sandstone

Arenite (Ferruginous Sandstone)

Red-orange cabochon, likely carnelian or glass imitation

Carnelian: chalcedony (microcrystalline SiO₂), commonly iron-colored

Chert (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Polished black pebble, possibly obsidian

Volcanic glass (obsidian), likely; identification is tentative from the image

Weathered metallic meteorite candidate

Unclassified iron-rich meteorite candidate; possible stony-iron or iron meteorite

Slag (Industrial)

N/A (Anthropogenic Slag)

Quartzite

Quartzite (composed primarily of SiO2)

Sea Glass

Amorphous silicon dioxide (Man-made glass weathered by nature)

Note: Item is not a geological specimen

Guitar Components (Steel, Nickel, Plastic, Wood)

Slag Glass

Amorphous Silica Glass (with metal oxide inclusions)

Amber jewelry (possibly amber-colored glass or resin)

Amber — fossilized plant resin, chiefly composed of polymerized terpenoids; the pictured material cannot be confirmed from the image

Sunstone

Andesine-Labradorite Feldspar ((Ca,Na)(Al,Si)4O8)

Diamond (or Simulant)

Carbon (C) or Cubic Zirconia (ZrO2)

Blue glass-like tumbled specimen

Most likely cobalt-blue slag glass or manufactured glass; not confidently identifiable as a natural mineral from the image

Slag (Industrial Byproduct)

Ferrous/Non-ferrous Silicate