Man Made Object (Metalwork)

Chert (likely flint)

Microcrystalline quartz, SiO₂

Fossil shark tooth (likely a cast or replica)

Shark tooth fossil; exact taxon cannot be determined from this image

United States Quarter Dollar

Cupronickel Clad Alloy (75% Copper, 25% Nickel over a 100% Copper core)

White pebble (likely quartz or milky quartz)

Quartz, SiO₂ (tentative identification from the image)

Likely faceted garnet

Garnet group, commonly almandine (Fe₃Al₂(SiO₄)₃); identification from the photo is uncertain

Polished brown stone, possibly tiger’s eye

Undetermined; tiger’s eye is quartz (SiO₂) with fibrous crocidolite-derived inclusions

Likely tumbled iron-stained quartz or chalcedony

Quartz/chalcedony (SiO₂), possibly limonite-coated

Likely ironstone or weathered iron-rich rock

Hematite/goethite-bearing ferruginous concretion; exact identification requires testing

Possible iron-rich concretion or weathered ironstone

Goethite/hematite-bearing limonite concretion (tentative)

Petrified Wood (Silicified Fossil)

Silicified Wood (SiO2)

Uncertain dark metallic mineral specimen

Possibly galena (lead sulfide, PbS), though the image is too blurred for reliable identification

Gold (Elemental Metal)

Gold (Au)

Nephrite Jade

Nephrite

Carved turquoise arrowhead/pendant

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

Weathered greenish-gray rock fragment

Tentatively basaltic or mafic metamorphic rock; exact identification is uncertain from the photograph

Faceted colorless gemstone, likely quartz (rock crystal) or synthetic glass imitation

Quartz: silicon dioxide (SiO₂), trigonal crystal system; exact identity cannot be confirmed visually

Dark rounded stone, possibly basalt

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

Mixed sedimentary rock and mineral specimens

Predominantly limestone, chert, sandstone, and iron-oxide-bearing clasts; exact identification requires testing

Tumbled dark stone, possibly obsidian or basalt

Uncertain from the photograph; likely volcanic glass (obsidian, SiO₂) or fine-grained basalt

Rounded iron-rich stone or concretion

Indeterminate; possibly hematite-/goethite-bearing sandstone or an ironstone concretion

Basalt cobble in concrete aggregate

Basalt; chiefly plagioclase feldspar and pyroxene, with possible olivine and iron-titanium oxides

Moon (lunar surface depiction)

Lunar rock; chiefly anorthosite, basalt, and breccia (plagioclase-rich CaAl2Si2O8)

Tumbled brown jasper pebble

Jasper, microcrystalline quartz (SiO₂), commonly with iron-oxide impurities

Black tumbled stone, possibly black tourmaline

Uncertain from the image; possibly schorl tourmaline, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Small tumbled brown stone, likely iron-stained quartz or jasper

Quartz (SiO₂) or microcrystalline quartz (chalcedony/jasper), identification uncertain from the image

Diamond

Carbon (C)

Aura Quartz / Rainbow Aura Quartz

Silicon Dioxide (SiO2) with metallic vapor coating

Diamond

Carbon (C)

Corundum (Pink Sapphire / Ruby)

Al2O3 (Aluminum Oxide)

Diamond (in a jewelry setting)

Carbon (C)

Light-colored rounded stone, possibly quartzite or limestone

Uncertain; likely quartzite (quartz, SiO₂) or calcitic limestone (calcite, CaCO₃)

Decorative opal-like turtle mosaic

Likely imitation or assembled opal material; exact stones cannot be confirmed visually

Unknown Organic Object (likely a berry or fruit)

Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.

Chintz

Microcrystalline Quartz (SiO2)

Small water-worn pebble, likely granite or granitic rock

Granite (tentative; exact identification is uncertain from the photo)

Gabbro

Gabbro

Turquoise cabochon

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

Petrified Wood

Silicified wood (primarily Silicon Dioxide, SiO2)

Fossilized shell fragment, likely bivalve

Bivalvia indet.; commonly preserved as calcite (CaCO₃) shell material

Polished septarian-style jasper or rhyolite

Likely silica-rich volcanic rock, possibly rhyolite, with iron-oxide and manganese-oxide veining

Polished gray stone pebble

Likely fine-grained basalt or andesite; exact identification is uncertain from the photograph

Fossil Shark Tooth

Lamniform (Mackerel Shark) fossil tooth, likely Otodus or Cretalamna