Man Made Glass (Not A Natural Rock Or Mineral)

Yellow faceted gemstone, likely citrine or yellow sapphire

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

Aventurine

Aventurine Quartz (SiO2 with inclusions of Fuchsite)

Likely milky quartz fragment

Quartz (SiO₂)

Diamond (as featured in jewelry)

Diamond (C - pure carbon)

Flint (gray chert)

Microcrystalline quartz (SiO₂), a variety of chert

Small metallic-looking mineral/rock fragment

Indeterminate from image; possibly galena, hematite, or metallic slag

Vesicular basalt (likely scoria)

Basaltic scoria; predominantly plagioclase, pyroxene, and olivine in a mafic volcanic glass/microcrystalline matrix

Polished garnet bead bracelet

Garnet group, likely almandine–pyrope solid solution; commonly approximated as Fe₃Al₂(SiO₄)₃–Mg₃Al₂(SiO₄)₃

Pumice or vesicular volcanic tuff

Pumice: highly vesicular volcanic glass, chiefly rhyolitic to dacitic; possible tuff: lithified ash and pumice fragments

Red Sandstone or Brick Fragment

Arenite (if sandstone)

Turquoise-style beaded bracelet

Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; possibly dyed or composite beads

Diamond (Cut jewelry specimen)

Diamond (pure Carbon, C)

Black stone bead bracelet

Likely black tourmaline (schorl), though identification is uncertain from the image

Diamond

Diamond (pure Carbon, C)

Amethyst gemstone ring

Quartz, purple variety — SiO₂

Sandstone

Arenite (SiO2 based clastic rock)

Faceted gemstone in a jewelry setting

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

Diamond (Cut Gemstone)

Carbon (C)

Sandstone

Arenite (SiO2 based)

Synthetic Marbled Aggregate (Footwear Component)

Ethylene-vinyl acetate (Croslite™)

Carved labradorite fish

Labradorite, calcium-rich plagioclase feldspar (approximately (Ca,Na)(Al,Si)₄O₈)

Amethyst crystal fragment

Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron and irradiation

Sandstone

Clastic sedimentary rock (quartz arenite)

Pearl

Organic gemstone (Calcium carbonate - CaCO3)

Tumbled chalcedony (likely milky quartz)

Microcrystalline quartz, SiO₂; possibly pale agate or quartzite

White quartz bead bracelet (likely milky quartz)

Quartz, silicon dioxide (SiO₂), usually microcrystalline or cloudy crystalline quartz

Granite

Felsic intrusive igneous rock

Sandstone (Pebble)

Sandstone (SiO2 with matrix/cement)

Amethyst beads

Amethyst, purple quartz (SiO₂)

Smoky Quartz

Smoky Quartz (Silicon Dioxide, SiO2)

Snowflake obsidian beads

Obsidian, volcanic glass (predominantly SiO₂), with pale cristobalite/spherulitic inclusions

Engineered Quartz Stone

Agglomerated Quartz (SiO2 + Polymer Resin)

Sandstone

Arenite (specifically sublithic or quartz arenite)

Faceted transparent gemstone pendant

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

Natural or Cultured Pearl

Calcium Carbonate (Aragonite and Conchiolin), CaCO3

Orgonite Pyramid (containing Amethyst and mixed minerals)

Silicon Dioxide (SiO2) in synthetic resin

Polished blue calcite sphere (tentative identification)

Calcite, CaCO₃; blue color generally results from trace impurities or inclusions

Vesicular basalt (possibly slag-contaminated)

Basalt; chiefly plagioclase and pyroxene, with possible olivine and secondary minerals

Clear faceted gemstone in an ornate metal bracelet

Unidentified transparent faceted stone; possibilities include quartz (SiO₂), zircon (ZrSiO₄), or glass—image alone cannot distinguish them

Sandstone

Arenite (primarily SiO2)

Blue-dyed Quartz Druzy

Silicon Dioxide (SiO2) with artificial pigment

Ruby in Matrix

Corundum (Al2O3)