Man Made Material (Metal)

Opalite (likely man-made opalescent glass)

Opalite; not a true mineral, typically synthetic opalescent glass (silica-based)

Quartz pebble (Quartztite fragment)

Silicon Dioxide (SiO2)

Obsidian

Volcanic Glass

Concrete

Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)

Sandstone (with concrete/human-made layer)

Clastic Sedimentary Rock (primarily Quartz/Feldspar grains)

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz

Tumbled clear quartz (rock crystal)

Quartz, silicon dioxide (SiO₂)

Likely tumbled or cut quartz/chalcedony fragment

Silicon dioxide (SiO₂), probably microcrystalline quartz or quartz

Polished labradorite sphere

Labradorite, calcic plagioclase feldspar ((Ca,Na)(Al,Si)₄O₈)

Citrine Quartz

Citrine (Silicon Dioxide, SiO2)

Faceted brown gemstone pendant, likely smoky quartz or champagne topaz

Probably quartz (SiO₂), smoky variety; alternatively topaz (Al₂SiO₄(F,OH)₂)

Slag (Industrial Glass/Glassy Rock)

Anthropogenic Vitreous Material

Unidentified gray metallic object

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

Amethyst gemstone ring

Quartz, purple variety — SiO₂

Decorated turquoise-like bead or mineral pendant

Likely turquoise [CuAl₆(PO₄)₄(OH)₈·4H₂O], possibly dyed composite or blue-green jasper

Polished brecciated jasper pendant

Jasper, an opaque microcrystalline variety of chalcedony (mostly SiO₂), with iron-oxide staining and likely brecciation

Goldstone

Aventurine Glass (Man-made glass with copper inclusions)

Faceted gemstone in a jewelry setting

Indeterminate from image; likely quartz, cubic zirconia, or another transparent faceted stone

Black onyx bead necklace

Black chalcedony, a microcrystalline quartz variety (SiO₂); beads may be dyed or treated

Polished brown jasper (likely brecciated or orbicular jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and other mineral inclusions

Turquoise cabochon ring

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Gold ring with a clear faceted gemstone

Likely diamond (crystalline carbon, C); identification is uncertain from the image

Diamond / Clear Quartz / Glass paste

Carbon (Diamond) / Silicon Dioxide (Quartz)

Goldstone

Aventurine glass (Synthetic glass with copper inclusions)

Cherry Quartz with Rose Quartz

Crystalline Quartz (SiO2) with glass-based synthetic components

Opalite (likely imitation opal glass)

Man-made opalescent glass; not a natural mineral (often sold as opalite)

Slag

Ferrous Slag (Siliceous industrial waste)

Yellow faceted gemstone, likely citrine or yellow sapphire

Uncertain; probable quartz (SiO₂) or corundum (Al₂O₃)

Goldstone

Man-made glass with copper inclusions

Banded agate cabochon

Microcrystalline quartz (chalcedony), SiO₂

Goldstone (blue/black aventurine glass)

Man-made aventurine glass; silica glass containing metallic copper or other glittering inclusions

Red goldstone beads

Goldstone (man-made copper-bearing glass; not a natural mineral)

US Penny

Cuprum (Copper: Cu) and Zincum (Zinc: Zn) Alloy

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Tumbled opalite (likely man-made glass)

Opalite glass; a synthetic opalescent glass, not a natural mineral species

Blue chalcedony bead necklace

Chalcedony, microcrystalline quartz (SiO₂), commonly blue-dyed or blue-gray natural chalcedony

Ceramic or Polished Stone Heart (Anthropogenic Material)

Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)

Small greenish crystal/mineral fragment

Indeterminate; possibly olivine, quartz, or a green gemstone fragment

Amber-set ring

Amber (fossilized plant resin; organic mineraloid), set in a metal ring

Iron Slag (Industrial Byproduct)

Anthropogenic Vitrification Product/Ferrous Slag

Carnelian cabochon pendant

Carnelian, orange-red chalcedony (microcrystalline quartz, SiO₂)

Carborundum (Silicon Carbide)

Silicon carbide (SiC)