Man Made Glass (Not A Natural Rock Or Mineral)

Sandstone

Arenite (SiO2 primarily)

Sandstone

Arenite (mostly SiO2)

Diamond

Diamond (pure Carbon, C)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Red Sandstone or Brick Fragment

Arenite (if sandstone)

Sandstone

Arenite (SiO2 based)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Obsidian

Volcanic Glass (Amorphous SiO2)

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Asphalt Pavement (with aggregate)

Asphalt concrete

Aventurine

Aventurine Quartz (SiO2 with inclusions of Fuchsite)

Carved smoky quartz (likely)

Quartz, silicon dioxide (SiO₂), smoky variety

Yellow faceted gemstone, likely citrine or yellow sapphire

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

Vesicular basalt (likely scoria)

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

Sandstone

Arenite (SiO2, often with CaCO3 or Fe2O3 cement)

Ruby in Matrix

Corundum (Al2O3)

Diamond (Cut Gemstone)

Carbon (C)

Pumice or vesicular volcanic tuff

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

Turquoise-style beaded bracelet

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

Polished garnet bead bracelet

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

Pearl

Organic gemstone (Calcium carbonate - CaCO3)

Amethyst crystal fragment

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

Faceted gemstone in a jewelry setting

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

Synthetic Marbled Aggregate (Footwear Component)

Ethylene-vinyl acetate (Croslite™)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based clastic rock)

Vesicular basalt (possibly slag-contaminated)

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

Black stone bead bracelet

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

Orgonite Pyramid (containing Amethyst and mixed minerals)

Silicon Dioxide (SiO2) in synthetic resin

Carved labradorite fish

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

Amethyst gemstone ring

Quartz, purple variety — SiO₂

Smoky Quartz

Smoky Quartz (Silicon Dioxide, SiO2)

Tumbled chalcedony (likely milky quartz)

Microcrystalline quartz, SiO₂; possibly pale agate or quartzite

Small metallic-looking mineral/rock fragment

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

Engineered Quartz Stone

Agglomerated Quartz (SiO2 + Polymer Resin)

Sandstone (Pebble)

Sandstone (SiO2 with matrix/cement)

Polished blue calcite sphere (tentative identification)

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

Stone bead bracelet

Unidentified polished natural-stone beads; possibly wood-grain jasper, agate, or serpentine

Dragon Vein Agate (Dyed/Treated)

Agate (SiO2)

Seven Chakra Bonded Stone

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

Blue-dyed Quartz Druzy

Silicon Dioxide (SiO2) with artificial pigment

Granite

Felsic intrusive igneous rock