Mineraloid (Human Made Geological Specimen)

Carved stone bowl or mortar

Uncertain; likely steatite (soapstone) or fine-grained volcanic stone

Dyed Pumice

Vesicular Rhyolite (Artificial Coloration Addition)

Polished orbicular/porphyritic granite or breccia

Likely potassium-feldspar–quartz granite with amphibole/biotite and epidote; exact variety uncertain from the image

Tumbled light-colored stone, possibly quartzite or limestone

Indeterminate; likely quartzite (mostly SiO₂) or calcitic limestone (CaCO₃)

Green glass-like cabochon, likely synthetic glass or resin

Unidentified green transparent material; possibly molded glass, synthetic spinel, or resin

Blue glassy gemstone-like specimen

Indeterminate; possibly dyed or treated turquoise, blue apatite, or man-made glass

Acrylic or Resin (Synthetic Imitation)

Polymethyl Methacrylate (PMMA) or Polyepoxide

Black Pearl (Tahitian Pearl)

Aragonite / Calcite (CaCO3) with Conchiolin

Probable amber fragment

Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)

Painted River Rock

Anthropogenic-modified Siliciclastic Sedimentary Rock

Polished green jasper cabochon (likely serpentine or nephrite imitation)

Jasper: microcrystalline quartz (SiO₂); green coloration may reflect chlorite, epidote, or iron minerals

Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)

Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)

Tumbled gray-blue stone, likely quartz-rich feldspar or granite pebble

Probable granitic fragment: quartz (SiO₂) with feldspar and minor mica; exact identification requires testing

Tumbled milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Obsidian (likely Apache tear or flaked obsidian)

Volcanic glass; primarily rhyolitic silica glass (SiO₂-rich, non-crystalline)

Tumbled chalcedony (likely moss or dendritic agate)

Microcrystalline quartz, SiO₂, with iron-oxide inclusions

Cobalt Glass Slug (Man-made Glass)

Amorphous Silica with Cobalt Oxide (SiO2 + CoO)

Amethyst bead bracelet

Amethyst, purple quartz (SiO₂)

Goldstone

Aventurine Glass (Man-made glass with copper inclusions)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Likely quartz crystal sphere

Quartz (silicon dioxide, SiO₂), possibly included or coated quartz

Blue cabochon gemstone ring

Likely blue turquoise, glass-filled sapphire, or blue spinel; exact identification requires testing

Tumbled clear quartz (rock crystal)

Quartz — silicon dioxide (SiO₂)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂), cryptocrystalline to microcrystalline variety

Green glassy slag or manufactured glass bead

Noncrystalline silicate glass; likely industrial glass/slag, not a true mineral

Tumbled blue stone, likely blue calcite

Calcite (CaCO₃), blue variety; identification is provisional from the image

Blue gemstone ring, likely sapphire

Corundum, Al₂O₃ (probable blue sapphire); surrounding stones may be diamonds or simulants

Polished tiger’s-eye jasper (likely brecciated jasper)

Quartz-rich microcrystalline silica; mainly chalcedony/quartz (SiO₂) with iron-oxide pigments

Chert (varietal Flint)

Microcrystalline quartz (SiO2)

Pearl

Calcium Carbonate (CaCO3) with Conchiolin

Tumbled blue-gray stone, likely marble or quartzite

Indeterminate; probably calcite marble (CaCO₃) or quartzite (SiO₂)

Polished agate or chalcedony nodule

Microcrystalline quartz (SiO₂), likely agate/chalcedony

Yellow chalcedony (likely lemon agate or yellow jasper)

Microcrystalline quartz, SiO₂; possibly iron-bearing jasper or chrysoprase-like chalcedony

Tumbled black obsidian (likely)

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

Likely tumbled green mineral (possibly serpentine or aventurine)

Indeterminate; possibilities include serpentine-group minerals, nephrite, or green aventurine quartz

Red garnet bead

Likely almandine–pyrope garnet, garnet-group silicate (approximately Fe₃Al₂Si₃O₁₂–Mg₃Al₂Si₃O₁₂)

Rose quartz bangle

Quartz, silicon dioxide (SiO₂), commonly colored by trace elements and inclusions

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Dark metallic-looking mineral specimen, possibly magnetite

Magnetite (Fe₃O₄), tentative identification

Chert (variations include Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Engraved polished dark stone (likely slate or basalt)

Probable fine-grained slate (microcrystalline phyllosilicates), possibly basalt; exact identification requires testing