Anthropogenic (Man Made Artifact)

Chert (Arrowhead Preform or Flake)

Microcrystalline Quartz (SiO2)

Chert (specifically Flint or Novaculite variant)

Chert (Microcrystalline Quartz, SiO2)

Chert (or Chalcedony)

Chert (Microcrystalline Quartz, SiO2)

Chert (Green variety)

Chert (Silicon Dioxide, SiO2)

Chert (variously known as Flint or River Pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (often called Flint)

Microcrystalline to cryptocrystalline quartz (SiO2)

Chert (Flint)

Microcrystalline Opaline Silica (SiO2)

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Chert (Arrowhead/Scraper Preform)

Silicon dioxide (SiO2)

Chert (Arrowhead/Projectile Point)

Microcrystalline Quartz (SiO2)

Handaxe with Inlaid Fossil Echinoid

Flint / Chert (SiO2) containing a fossil Conulus albogalerus

Native Silver

Silver (elemental Ag)

Red jasper flake/tool blank

Jasper, microcrystalline quartz (SiO₂), colored by iron oxides

Nickel coin (U.S. currency)

Cupronickel (75% Copper, 25% Nickel alloy)

Jade (likely Nephrite Jade based on appearance)

Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)

Weathered sandstone or fine-grained sedimentary rock

Quartz-rich sandstone, possibly arkose or lithic sandstone

Chert (specifically as a lithic artifact/projectile point)

Chert (Silicon dioxide, SiO2)

Chert or flint cobbles

Microcrystalline quartz (SiO₂), commonly with chalcedony

Banded Slag Glass (Leland Blue/Frankfort Green style)

Anthropogenic Glass Specimen (Amorphous Silicon Dioxide with impurities)

Flint or chert flake

Microcrystalline quartz (SiO₂), commonly chalcedony with possible minor impurities

Polished blue calcite sphere (tentative identification)

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

Flint or chert flake/tool

Microcrystalline quartz (chalcedony), SiO₂

Iron-rich slag or weathered ironstone fragments

Probably hematite–goethite material; possibly industrial iron slag (Fe₂O₃/FeO(OH))

Sandstone (Grooved/Weathered)

Arenite (composed primarily of Quartz and Lithic fragments)

Chert Nodules in Limestone

Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert

Microcrystalline Quartz (SiO2)

Chert or flint fragment

Microcrystalline quartz (SiO₂), possibly iron-stained chert

Chert (flint), likely with iron-stained weathering rind

Microcrystalline quartz/chalcedony (SiO₂)

Chert (often called Flint or Jasper when red)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Nodule)

Chert (Silicon Dioxide, SiO2)

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (often found as Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Diamond (in a gold ring)

Diamond (pure carbon, C)

Granodiorite

Granodiorite

Flint (chert) flake/tool

Microcrystalline quartz (SiO₂), likely brown flint/chert

Ferruginous Slag (Iron Smelting Byproduct)

Anthropogenic Vitreous Silicate (often containing Fayalite: Fe2SiO4)

Granite Pebble

Granite (Phaneritic intrusive igneous rock comprising Quartz, Feldspar, and Mica)

Tumbled aqua glassy mineral specimen, likely chrysocolla or turquoise imitation

Uncertain from image; possible chrysocolla (hydrated copper aluminosilicate, variable composition) or dyed/man-made glass

Chert (Arrowhead variety)

Chert (SiO2)

Weathered flint or chert nodule

Microcrystalline quartz (SiO₂), commonly flint/chert