Anthropogenic Material

Micrometeorite (Spherule)

Extraterrestrial Accretion Spherule

Turquoise (rough, likely stabilized or treated)

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O

Dyed blue-purple tumbled stone, likely quartz or calcite

Uncertain; commonly dyed quartzite/chalcedony (SiO₂) or calcite (CaCO₃)

Green aventurine (probable)

Quartzite dominated by quartz (SiO₂), with green fuchsite mica inclusions

Tumbled quartz-rich pebble

Likely milky quartz with a dark mafic inclusion or attached basalt; exact identification requires testing

Petrified Wood (Silicified Fossil)

Silicified Wood (SiO2)

Tumbled green aventurine (probable)

Quartzite dominated by quartz (SiO₂) with fuchsite or other green inclusions

Polished red jasper (likely brecciated jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored mainly by iron oxides

Petrified Wood

Silicified wood (Quartz/Chalcedony replacement of cellulose)

Petrified Wood

Silicified Wood (SiO2)

Blue sodalite-bearing rock, possibly lapis lazuli

Sodalite (Na₈Al₆Si₆O₂₄Cl₂), commonly in lazurite–calcite–pyrite assemblages

Amber

Succiniferous organic material (Succinite)

Mudstone

Lutylite (group of fine-grained sedimentary rocks)

Purple chalcedony or lavender quartz

Cryptocrystalline quartz, SiO₂ (likely chalcedony; identification uncertain from photograph)

Weathered greenish metamorphic rock, possibly serpentinite

Serpentinite, dominated by serpentine-group minerals (antigorite, lizardite, or chrysotile)

Likely rough amethyst (purple quartz)

Quartz, SiO₂; purple coloration typically caused by trace iron and natural irradiation

Unidentified purple mineral fragment

Possibly amethyst (quartz), but the image is insufficient for confident identification

Mica-rich schist (likely muscovite schist)

Muscovite–quartz schist; chiefly muscovite mica, quartz, and minor feldspar/biotite

Greenstone / altered mafic rock

Likely serpentinite or chlorite-rich metabasalt; exact identification requires testing

Polished/tumbled yellow-brown chert (likely jasper)

Microcrystalline quartz (chalcedony), SiO₂, iron-oxide colored

Vesicular volcanic rock, likely scoria

Scoria; vesicular basaltic to andesitic volcanic rock

Fluorescent glassy mineral specimen, possibly hyalite opal

Hyalite (hydrated amorphous silica, SiO₂·nH₂O), tentative

Tumbled amazonite

Amazonite, green microcline feldspar (KAlSi₃O₈)

Quartz-rich iron-stained metamorphic rock (likely quartzite)

Quartzite; predominantly quartz (SiO₂) with iron oxides/hydroxides, possibly feldspar and mica

Likely tumbled iron-stained quartz or chalcedony

Quartz/chalcedony (SiO₂), possibly limonite-coated

Tumbled quartz-rich stone (likely milky quartz/quartzite)

Quartz (SiO₂), possibly quartzite with minor iron-oxide staining

Diorite

Diorite (intermediate intrusive igneous rock)

Sandstone

Arenite (SiO2 based with mineral cement)

Chert (Quartz var.)

Silicon Dioxide (SiO2)

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Sandstone

Arenite (Sedimentary rock comprising sand-sized grains)

Tumbled river pebble, likely limestone or weathered chert

Indeterminate carbonate/siliceous pebble; possible micritic limestone or chert

Cullet Glass / Slag Glass

Amorphous silica glass

Polished dark greenstone with quartz vein

Likely chlorite-rich metabasalt or greenschist with a quartz–feldspar vein

Polished amber-like gemstone bead

Possibly amber (fossilized tree resin; composition varies)

Likely sandstone pebble

Quartz-rich sandstone (composition cannot be confirmed from the image)

Iron-rich jasper or hematite-bearing chert

Microcrystalline quartz (SiO₂) with hematite/goethite (Fe₂O₃/FeO(OH))

Tumbled blue-gray stone, likely basalt or slate

Probable fine-grained basalt; exact identification is uncertain from the photograph

Turquoise bead bracelet

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Ring with an Orange Inlay

N/A (Man-made object)

Banded iron formation fragment (likely hematite–magnetite ironstone)

Banded iron formation; chiefly hematite (Fe₂O₃), magnetite (Fe₃O₄), and microcrystalline quartz (SiO₂)

Likely weathered quartz-rich rock fragment

Uncertain; possibly quartz sandstone or a pale feldspathic rock