Anthropogenic Material

Shark Tooth Fossil

Chondrichthyes tooth

Tuff

Volcanic Tuff

Cubic Zirconia (or possibly Diamond)

Zirconium dioxide (or Carbon)

Tumbled greenstone (likely serpentine or nephrite jade)

Serpentine-group minerals, chiefly antigorite/lizardite; possibly nephrite, a tremolite–actinolite amphibole aggregate

Yellow chalcedony (likely citrine-like quartz)

Cryptocrystalline quartz, SiO₂; possibly iron-stained chalcedony or pale citrine

Tumbled chalcedony (likely pale agate or common opal)

Microcrystalline quartz, SiO₂; possibly hydrated silica, SiO₂·nH₂O, if opal

Polished serpentine-rich stone

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

Tumbled sodalite

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

Limestone

Calcium Carbonate (CaCO3)

Diorite (Polished Tumble)

Diorite (Intermediate intrusive igneous rock)

Coquina

Biogenic Limestone (Calcite, CaCO3)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz with Tourmaline

Silicon dioxide with complex boro-silicate (SiO2 + Na(Fe3+Al6)(BO3)3Si6O18(OH)4)

Slag Glass

Silicon dioxide with impurities

Chrysocolla-bearing rock (likely chrysocolla in quartz/limonite matrix)

Chrysocolla, hydrated copper aluminosilicate: (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O

Carved jade pendant, likely nephrite

Nephrite jade (tremolite–actinolite amphibole); species not confirmable from the image

Polished banded calcite (often sold as “onyx marble” or Mexican onyx)

Banded calcite, CaCO₃ (sometimes aragonite); decorative “onyx marble” is not true quartz onyx

Tumbled white quartz pebble

Quartz (silicon dioxide, SiO₂)

Possible iron meteorite

Fe–Ni iron meteorite, possibly an ordinary chondrite or weathered iron-rich specimen

Petrified Wood

Silicified Wood (Silicon Dioxide - SiO2)

Green Jasper

Silicon Dioxide (SiO2)

Weathered quartz-rich rock fragment

Likely milky quartz–bearing quartzite or silica-rich chert; exact identification requires testing

Brecciated jasper (likely ocean jasper or red jasper)

Microcrystalline quartz, SiO₂, with iron-oxide pigments and breccia cement

Polished brecciated jasper

Microcrystalline quartz (SiO₂), with iron-oxide staining

Gold ring with a dark, possibly gemstone setting

Gold alloy; the dark setting is not identifiable from the image

Petrified Wood

Silicified wood (Quartz/Chalcedony replacement of organic matter)

Tumbled orange chalcedony or jasper pebble

Microcrystalline quartz, SiO₂; possibly iron-stained chalcedony/jasper

Milky Quartz

Silicon Dioxide (SiO2)

Serpentinite with carbonate and iron-oxide alteration

Serpentinite; chiefly antigorite/lizardite Mg₃Si₂O₅(OH)₄, with magnetite, calcite, and chromian minerals

Citrine-colored polished beads (material uncertain)

Possibly citrine quartz (SiO₂); the image alone cannot confirm the beads are natural stone rather than glass or another imitation.

Tumbled tan stone, possibly sandstone or weathered limestone

Indeterminate; likely quartz-rich sandstone or calcitic limestone

Polished leopard skin jasper

Orbicular jasper/chert; chiefly microcrystalline quartz (SiO₂) with iron-oxide and other mineral inclusions

Petrified Wood

Silicified Wood (SiO2)

Beaded blue-and-green gemstone jewelry

Likely dyed or treated chalcedony/agate and green aventurine or glass-like stone; exact identification requires testing

Flint

Microcrystalline quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Diamond (in a gold ring)

Diamond (pure carbon, C)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone

Clastic sedimentary rock (Quartz arenite / Arkose)

Schist

Mica Schist

Coquina

Coquina (Bioclastic Limestone)