Man Made Material (Constructed)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Likely flint pebble (possibly a worked flint fragment)

Microcrystalline quartz (chalcedony), SiO₂; commonly called flint

Sandstone (Quartzose)

Sandstone (SiO2 dominated)

Chert (varieties: Flint or Jasper)

Silicon dioxide (SiO2) / Microcrystalline Quartz

Banded Chert (River Stone)

Silicon Dioxide (SiO2)

Chert / Flint

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Commonly known as Flint)

Silicon Dioxide (SiO2)

Chert (Jasper/Common Chert Pebble)

Microcrystalline Quartz (SiO2)

Green iridescent glass cabochon or synthetic gemstone

Likely synthetic glass; possibly coated synthetic quartz or lab-created green gemstone

Sandstone (with potential Arkose/Lithic characteristics)

Arenite (Sedimentary rock composed of sand-sized grains)

Sandstone

Arenite (SiO2 composition dominant)

Polished/tumbled brown-and-white mineral fragment

Indeterminate; possibly quartz-rich jasper, brecciated jasper, or an iron-stained quartz mineral

Colorless faceted gemstone, likely quartz

Quartz (SiO₂), tentative identification; the photo is insufficient to confirm the material

Sandstone Pebble

Sedimentary Rock (Quartzose Sandstone)

Red Sandstone

Arenite (Fe2O3 enriched)

Asphalt Concrete

Bituminous Concrete / Asphaltic Composite

Synthetic Marbled Aggregate (Footwear Component)

Ethylene-vinyl acetate (Croslite™)

Chert

Microcrystalline Quartz (SiO2)

Flint or chert fragment

Microcrystalline quartz (SiO₂), likely flint/chert

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (Jasper)

Silicon Dioxide (SiO2)

Chert (Yellow/Tan variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Chert Nodule (Flint)

Chert (Silicon Dioxide, SiO2)

Diamond

Diamond (Pure Carbon, C)

Green Quartzite

Metamorphic Quartzite (often colored by chromium-bearing minerals or fuchsite)

Sandstone

Arenite (composed primarily of SiO2)

Green cabochon gemstone, likely aventurine or dyed chalcedony

Indeterminate from image; possible quartz variety (SiO₂), including aventurine quartz or chalcedony

Black-and-white agate geode pendant

Agate (microcrystalline quartz, SiO₂), likely a hollow geode slice with chalcedony and drusy quartz

Red Sandstone

Quartz Arenite (iron-stained) / SiO2

Sandstone

Arenite (composed primarily of SiO2)

White Marble (Tumbled)

Recrystallized Calcite (CaCO3)

Blue glassy cabochon, likely blue quartz or synthetic glass

Possibly dyed blue chalcedony/quartz (SiO₂); visual identification is inconclusive

Pearl and Garnet Glass

Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass

Sunstone (Aventurine Feldspar)

(Ca,Na)((Al,Si)2Si2O8) with inclusions of Cu or Fe2O3

Granite

Granite (Mainly Quartz SiO2, Feldspar KAlSi3O8, and Mica KAl2(AlSi3O10)(OH)2)

Green cabochon gemstone, likely nephrite jade

Nephrite jade—interlocking amphibole fibers, chiefly tremolite-actinolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂

Amber-set ring

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

Tumbled amethyst quartz

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

Polished blue stone, likely sodalite or dyed agate

Sodalite: Na₈(Al₆Si₆O₂₄)Cl₂; exact identification requires testing

Sandstone

Sedimentary Rock (Quartz Sandstone)

Quartzite

Metamorphic Quartzite (SiO2)