Manufactured Stone

Nephrite Jade

Ca2(Mg, Fe)5Si8O22(OH)2

Weathered fossiliferous limestone

Calcitic limestone, predominantly calcite (CaCO₃), possibly bioclastic

Quartz fragment

Quartz (silicon dioxide, SiO₂)

Weathered limestone or concrete-like calcareous rock

Limestone; predominantly calcite (CaCO₃), possibly containing dolomite and silicate impurities

Tumbled mahogany obsidian

Volcanic glass, predominantly rhyolitic silica (SiO₂), with iron-oxide inclusions

Asphalt (Bituminous Concrete)

Composite material (bitumen binder with mineral aggregate)

Polished brown pebble, likely jasper or iron-stained quartzite

Uncertain; possible microcrystalline quartz (SiO₂) with iron-oxide staining

Polished black gemstone, likely obsidian

Volcanic glass; primarily silica-rich rhyolitic composition (approximately SiO₂)

Iron-rich breccia or weathered ironstone

Goethite–hematite-bearing limonite, possibly with quartz and altered rock fragments

Synthetic Convention Badge (Plastic/PVC)

Polyvinyl Chloride (PVC) / Polycarbonate

Faceted citrine-colored gemstone (likely synthetic/display stone)

Quartz, SiO₂, if natural citrine; possibly synthetic sapphire or glass imitation

Small gray translucent stone, possibly quartz or glassy mineral

Uncertain; likely microcrystalline quartz (SiO₂), but the image is insufficient for definitive identification

Tumbled brown-and-black stone, likely mahogany obsidian

Volcanic glass; predominantly rhyolitic obsidian, SiO₂-rich

Colorless faceted gemstone, likely synthetic cubic zirconia

Cubic zirconia (zirconium dioxide, ZrO₂); natural diamond is a less likely alternative

Likely polished dark stone (identity uncertain)

Undetermined; possibly polished basalt, chert, or another dark silicate rock

Weathered gray rock fragment

Likely quartz-rich sandstone or weakly metamorphosed sandstone; exact identification is uncertain from the photograph

Small brown-gray mineral fragment

Indeterminate; possibly weathered quartz-, feldspar-, or iron-oxide-bearing rock

Quartz-bearing granite or granitic gneiss

Granite; chiefly quartz (SiO₂), feldspar, and dark mica/amphibole

Opalite

Synthetic Fluorescent Glass (SiO2 + impurities)

Carnelian Beads

Silicon Dioxide (Variety of Chalcedony), $SiO_2$

Opalite (a synthetic glass)

Silicon Dioxide (SiO2) with various additives; not a true mineral but a man-made gem simulant

Gemstone-set ring, likely cubic zirconia or diamond

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

Fossiliferous limestone

Calcitic limestone, predominantly CaCO₃ (often containing fossilized coral or shell fragments)

Polished black stone, likely obsidian

Volcanic glass; primarily silica-rich, noncrystalline SiO₂

Polished black star-shaped stone, likely black obsidian

Obsidian (volcanic glass), primarily SiO₂

Zirconia (Ceramic) & Ion-X Glass

Zirconium Dioxide (ZrO2) and Ion-strengthened Aluminosilicate Glass

Diamond Plate (Steel)

Alloyed Carbon Steel or Aluminum with 'Durbar' pattern

Quartzite

Metamorphic Quartzite (SiO2)

Small rounded pebble, likely sandstone or weathered limestone

Indeterminate clastic carbonate/siliciclastic pebble; mineral composition appears dominated by quartz, feldspar, and/or calcite

Native Gold

Gold (Au)

Polished black stone, likely black obsidian

Obsidian, volcanic glass; primarily silica-rich SiO₂ with minor feldspar, iron, and magnesium

Tumbled white quartz (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Small metallic mineral fragment

Indeterminate; possibly galena, hematite, magnetite, or metallic meteorite fragment

Small rounded pebble, likely limestone or quartz-rich sedimentary fragment

Indeterminate lithic clast; probable micritic limestone (CaCO₃) or weathered quartz-rich stone

Chakra Stone Bracelet (mixed gemstones)

Multi-mineral/Gemstone assembly (primarily Quartz variety beads)

Metallic Ornament / Jewelry

N/A - This is an artificial object, not a geological specimen.

Tumbled blue-green stone, possibly dyed turquoise or chrysocolla

Uncertain; turquoise is hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Black tourmaline (likely schorl), polished

Schorl tourmaline — NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Red glassy cabochon, likely synthetic ruby or red glass

Uncertain; possible synthetic corundum (Al₂O₃, chromium-colored) or man-made glass

Blue sapphire (likely synthetic or treated corundum)

Corundum, aluminum oxide (Al₂O₃), blue from iron and titanium impurities

Iridescent polished/tumbled stone (likely coated quartz or glassy synthetic material)

Indeterminate; possibly quartz (SiO₂) with an artificial iridescent coating

Unidentified gray metallic object

Not determinable from the image; likely a metal screw or manufactured fastener rather than geological material