Man Made Material

Nacre (Mother of Pearl)

Nacre (Biogenic Aragonite/Calcite composite, CaCO3)

Coquina

Bioclastic Limestone (composed primarily of CaCO3)

Fossil coral in limestone

Fossilized colonial coral, likely tabulate or favositid coral (CaCO₃), preserved in calcitic limestone

Pink Granite

Phaneritic Felsic Igneous Rock (composed of orthoclase, quartz, and plagioclase)

Likely gold-colored metal ring with a possible gemstone

Uncertain; possibly gold alloy (Au) with a small quartz or glass-like setting

Goldstone (blue-goldstone–style glass) beads

Artificial aventurine glass, typically silica glass with copper inclusions; not a natural mineral

Faceted glass-like gemstone object

Likely synthetic glass or cubic zirconia; exact material cannot be confirmed from the image

Sandstone (likely Fossilized Wood or Concrete Simulacrum)

Arenite / Silicified Wood / Anthropogenic Concrete

Coquina

Biogenic Limestone (Coquina)

Crushed Stone / Gravel

Aggregatus saxum (variable mineral composition)

Sandstone

Arenite (SiO2 based clastic rock)

Chalk

Calcium carbonate (CaCO3)

Dark rounded pebble, likely basalt or slag

Probable fine-grained mafic rock; possibly basalt (plagioclase–pyroxene) or industrial iron/steel slag

Decorative gemstone bracelet or jewelry

Unidentifiable from the blurred image; likely colored glass or synthetic stones, possibly mixed gemstone beads

Diamond

Carbon (C)

Green Aventurine

Quartz (SiO2) with Fuchsite inclusions

Diamond

Carbon (C)

Fossilized Coral (Coquina/Limestone)

Cnidaria Anthozoa (Fossilized)

Pumice or vesicular volcanic tuff

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

Chert (Flint)

Chert (Cryptocrystalline Silica, SiO2)

Chert (and associated river cobbles)

Silicon dioxide (SiO2)

Chert (and/or Flint)

Chert (Cryptocrystalline variety of Quartz, SiO2)

Polished jasper pendant

Jasper, microcrystalline quartz (SiO₂) with iron-oxide and other mineral inclusions

Sandstone

Arenite (primarily SiO2)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (often called Flint)

Chert (SiO2)

Green iridescent glass cabochon or synthetic gemstone

Likely synthetic glass; possibly coated synthetic quartz or lab-created green gemstone

Sandstone

Sedimentary Rock (Quartz arenite)

Bituminous Coal (with Anthracite or Vitrinite inclusion)

Organic-rich Sedimentary Rock (Carboniferous classification)

Chert (often called Flint or Agate nodule)

Cryptocrystalline Quartz (SiO2)

Sandstone (Quartzose)

Sandstone (SiO2 dominated)

Asphalt Chunk (with aggregate)

Bituminous concrete / Anthropogenic conglomerate

Amber cabochon pendant

Amber (fossilized plant resin), chiefly polymerized diterpenoid resin

Green Slag Glass

Cullet (Amorphous Silicon Dioxide with impurities)

Sandstone

Arenite (SiO2 primarily)

Jasper (Iron-rich Chalcedony)

Jasper (Microcrystalline Silicon Dioxide, SiO2 plus iron oxide impurities)

Black-and-white agate or onyx bead necklace

Variegated chalcedony (microcrystalline SiO₂), possibly black-and-white banded agate; some black beads may be dyed chalcedony or hematite

Blue faceted gemstone ring, likely synthetic sapphire or blue topaz

Uncertain from image; possible corundum (Al₂O₃) or topaz (Al₂SiO₄(F,OH)₂)

Chalcedony (Agate / Jasper Specimen)

Silicon Dioxide (SiO2)

Sandstone (likely Quartzose Sandstone)

Arenite

Tumbled ruby-in-zoisite (likely)

Ruby-bearing zoisite; zoisite Ca₂Al₃(SiO₄)₃(OH), corundum ruby Al₂O₃