Anthropogenic Specimen (Man Made Material)

Chert (Flint/Chalcedony)

Silicon Dioxide (SiO2)

Chert Arrowhead

Chert (Cryptocrystalline variety of Quartz, SiO2)

Chert / Green Jasper

Silicon Dioxide (SiO2)

Diamond

Carbon (C)

Possible tektite or volcanic glass specimen

Natural silica glass; composition commonly near SiO₂, but exact identification requires chemical testing

Sea Glass (Turquoise/Aqua)

Amorphous Silica (SiO2) with transition metal dopants

Diamond

Native Carbon (C)

Chert

Silicon dioxide (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Diamond (Cut jewelry specimen)

Diamond (pure Carbon, C)

Colorless faceted quartz-like gemstone

Likely quartz (SiO₂), though the appearance may also indicate man-made glass or cubic zirconia

Small dark mineral/rock fragment

Indeterminate; possibly magnetite-bearing basalt or iron-rich slag

Goldstone (Red/Brown)

Aventurine Glass (SiO2 with Copper inclusions)

Sea Glass (Uranium/Vaseline Glass variant)

Silicon Dioxide (SiO2) with trace Uranium Oxide (U3O8)

Decorated turquoise-like bead or mineral pendant

Likely turquoise [CuAl₆(PO₄)₄(OH)₈·4H₂O], possibly dyed composite or blue-green jasper

Chert (often called Flint or Jasper)

Microcrystalline Quartz (SiO2)

Aventurine

Quartz containing inclusions of Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Tumbled black stone, likely black obsidian

Obsidian; volcanic glass, typically rhyolitic composition (SiO₂-rich)

Beaded gemstone bracelet

Indeterminate; likely small polished mineral beads, possibly turquoise or dyed stone, with metal and glass components

Tumbled chalcedony or quartz pebble

Microcrystalline quartz (SiO₂), likely orange chalcedony/carnelian

Man-made Blank Ammunition (Brass)

CuZn (Cartridge Brass - roughly 70% Copper, 30% Zinc)

Chert (Yellow Jasper)

Cryptocrystalline Quartz (SiO2)

Green cabochon gemstone, likely aventurine or dyed chalcedony

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

Limestone

Calcareous sedimentary rock (CaCO3)

Slag Glass (Cullet)

Amorphous Silica (man-made), primarily SiO2 with trace metal oxides

Green Agate

Silicon dioxide (SiO₂)

Chert (Black Flint)

Silicon Dioxide (SiO2)

Opalite

Man-made synthetic glass with opalescent effects (SiO2 + metal oxides)

Tumbled chalcedony or quartz pebble

Microcrystalline quartz, SiO₂ (likely chalcedony); exact identification is uncertain from the image

Diamond (as set in a metal alloy ring)

Diamond (Pure Carbon, C)

Mystic Topaz

Aluminum silicate fluoride hydroxide with titanium coating (Al2SiO4(F,OH)2)

Granodiorite

Granodiorite

Chert

Microcrystalline Silicon Dioxide (SiO2)

Possible basaltic volcanic rock or iron-rich meteorite

Likely basalt (plagioclase–pyroxene rock); meteorite status cannot be confirmed visually

Sand Tiger Shark Tooth (Fossil)

Carcharias taurus (fossilized dentin/enameloid)

Tumbled black obsidian (likely)

Volcanic glass; chiefly silica-rich rhyolitic glass (SiO₂)

Flint (chert), likely a worked stone flake

Microcrystalline quartz (SiO₂); cryptocrystalline variety of quartz

Pumice or vesicular volcanic tuff

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

Botryoidal chalcedony with iron-oxide staining

Microcrystalline quartz (SiO₂), likely iron-oxide-bearing chalcedony

Sandstone

Arenite (specifically sublithic or quartz arenite)

Unidentified gray metallic object

Not determinable from the image; likely a metal screw or manufactured fastener rather than geological material

Chert (Flint)

Microcrystalline Quartz (SiO2)