Mineraloid (Human Made Geological Specimen)

Obsidian

Volcanic Glass (SiO2)

Faceted glass-like gemstone object

Likely synthetic glass or cubic zirconia; exact material cannot be confirmed from the image

Concrete-like aggregate surface with embedded rock fragments

Anthropogenic concrete or exposed aggregate; not a natural rock specimen

Engineered Quartz Stone

Agglomerated Quartz (SiO2 + Polymer Resin)

Faceted transparent gemstone pendant

Uncertain from image; likely faceted quartz (SiO₂), cubic zirconia (ZrO₂), or glass imitation

Red glass-like crystal, likely synthetic ruby or red glass

Uncertain from image; possible corundum (ruby), Al₂O₃, or synthetic glass

Unknown dark mineral/rock fragment

Indeterminate; possibly a dark sulfide mineral or slag-like geological fragment

Sandstone Concretion

Sedimentary concretion

Goldstone (aventurine glass)

Synthetic copper-bearing soda-lime glass; commonly sold as red goldstone

Amber cabochon pendant

Amber (fossilized plant resin), chiefly polymerized diterpenoid resin

Carved red jasper bead (likely ceramic imitation)

Jasper, microcrystalline quartz (SiO₂); exact material uncertain from the image

Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)

Chalcedony (SiO₂)

Polished yellow-green serpentine pendant

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

Paving-concrete aggregate with a rounded stone

Polymictic gravel aggregate; the central clast appears to be weathered sandstone or volcanic rock

Decorative mosaic cross containing mixed rock and glass fragments

Polychrome aggregate; likely quartz, feldspar, marble, granite, and assorted colored glass

Polished black pebble, possibly obsidian

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

Obsidian

Volcanic Glass (SiO2 rich)

Opalite

Man-made synthetic glass with opalescent effects (SiO2 + metal oxides)

Small metallic-gold mineral fragment, possibly pyrite

Pyrite (FeS₂), if confirmed

Red cabochon gemstone ring (likely ruby or red spinel; identity unconfirmed)

Possibly corundum (ruby, Al₂O₃) or spinel (MgAl₂O₄); visual identification alone cannot distinguish these from glass or synthetic stones.

Banded Sandstone

Arenite with Liesegang banding

Chert (Flint Arrowhead)

Silicon Dioxide (SiO2)

Beaded gemstone bracelet

Indeterminate; likely small polished mineral beads, possibly turquoise or dyed stone, with metal and glass components

Cullet Glass (Man-made Glass Slag)

Amorphous Silica (SiO2) with chemical additives

Red cabochon gemstone ring (likely glass or synthetic stone)

Undetermined; the image does not establish a natural mineral identity

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Yellow faceted gemstone, likely citrine or yellow sapphire

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

Chert (Yellow Jasper/Flint)

Silicon Dioxide (SiO2)

Likely gold-colored metal ring with a possible gemstone

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

Likely blue glass or synthetic gemstone jewelry

Uncertain; possibly synthetic spinel, cubic zirconia, or blue glass

Note: No specimen visible

Bismuth crystal

Bismuth (Bi), synthetic laboratory-grown crystal

Faceted brown gemstone pendant, likely smoky quartz or champagne topaz

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

Asphalt aggregate

Human-made bituminous asphalt containing crushed silicate rock aggregate

Native American Pottery Sherd

Obsidian

Obsidian (Volcanic Glass)

Diamond ring

Diamond, crystalline carbon (C)

Painted River Rock

Artificially Coated Sedimentary Rock

Likely polished quartz or glass-like mineral cabochon

Probably quartz (SiO₂), though the image cannot exclude man-made glass

Polished amethyst-bearing quartz

Quartz, SiO₂; purple coloration from irradiation and trace iron

Seven Chakra Bonded Stone

Bonded composite of Red Jasper, Carnelian, Tiger's Eye, Aventurine, Lapis Lazuli, Amethyst, and Clear Quartz

Tumbled gray stone, likely quartz-rich pebble

Probable microcrystalline quartz/chalcedony (SiO₂), possibly gray jasper or quartzite