Man Made Material (Metal)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Likely iron-rich rock or metallic mineral fragment

Uncertain; possibly limonite/goethite-rich material or weathered iron meteorite fragment

Sandstone (with potential Arkose/Lithic characteristics)

Arenite (Sedimentary rock composed of sand-sized grains)

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)

Fossiliferous limestone (likely ammonite/gastropod-bearing)

Bioclastic limestone; predominantly calcite (CaCO₃)

Gold-bearing quartz vein rock (likely pyrite-rich quartzite)

Quartz (SiO₂) with iron sulfides, chiefly pyrite (FeS₂), possibly chalcopyrite (CuFeS₂); gold cannot be confirmed visually

Rose Quartz and Lepidolite in Pegmatite

Crystalline Silicon Dioxide (SiO2) with Lithium-rich Mica (K(Li,Al)3(Al,Si)4O10(F,OH)2)

Vesicular basalt (possibly industrial slag)

Basalt, chiefly plagioclase + pyroxene ± olivine; exact identification is uncertain from the image

Sandstone

Arenite (SiO2 composition dominant)

Black tourmaline pendant

Schorl tourmaline, NaFe3Al6(BO3)3Si6O18(OH)4

Sandstone (Quartzose)

Sandstone (SiO2 dominated)

Green iridescent glass cabochon or synthetic gemstone

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

Likely metallic mineral specimens

Probably native iron or iron oxide/hydroxide material; exact identification requires testing

Tumbled jadeite or nephrite jade bead bracelet

Jade: jadeite (NaAlSi₂O₆) or nephrite, a tremolite–actinolite amphibole aggregate

Blue glass-like heart pendant, likely synthetic blue spinel or colored glass

Unconfirmed; possibly synthetic spinel (MgAl₂O₄) or cobalt-colored glass

Bismuth

Native Bismuth (Bi)

Polished/tumbled brown-and-white mineral fragment

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

Weathered iron-rich chert or jasper

Microcrystalline quartz (SiO₂), variably stained by iron oxides/hydroxides

Iron meteorite candidate

Likely iron-rich meteorite, possibly an ordinary chondrite or weathered iron meteorite; confirmation requires testing

Iron-rich meteorite candidate (possibly stony-iron meteorite)

Unclassified meteoritic material; apparent Fe-Ni metal with silicate matrix

Diamond ring

Diamond (crystalline carbon, C)

Iron meteorite (probable)

Fe–Ni metallic meteorite, commonly kamacite/taenite

Red Sandstone

Arenite (Fe2O3 enriched)

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)

Diamond ring

Diamond (crystalline carbon, C)

Weathered biotite-rich schist

Mica schist, chiefly quartz + biotite/muscovite; possibly garnet-bearing

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Green Quartzite

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

Sandstone

Arenite (composed primarily of SiO2)

Granite

Intrusive Igneous Rock

Limestone

Calcium Carbonate (CaCO3)