Man Made Material (Anthropogenic 'Mineraloid')

Petrified Wood

Silicified Wood (SiO2)

Chert (Flint Arrowhead)

Silicon Dioxide (SiO2)

Galena (lead sulfide)

Galena, PbS

Chert (often called Flint or Jasper)

Microcrystalline Quartz (SiO2)

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Sandstone Pebble

Ferruginous Sandstone (SiO2 with Fe2O3)

Chert Nodule

Microcrystalline Quartz (SiO2)

Jade

Jadeite or Nephrite

Beach Pebble (Chalcedony / Chert)

Silicon Dioxide (SiO2)

Tumbled brown chalcedony or agate

Microcrystalline quartz (SiO₂), likely chalcedony; possibly iron-stained jasper or agate

Chert (varietal Flint)

Microcrystalline quartz (SiO2)

Sandstone

Arenite

Chert (Common Variety, Jasper)

Microcrystalline Quartz (SiO2)

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Chert (Nodule)

Chert (Alpha-Quartz, SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Likely banded obsidian or dark volcanic glass

Obsidian, predominantly rhyolitic volcanic glass (SiO₂-rich), possibly with devitrified bands and phenocrysts

Tumbled chalcedony or quartz pebble

Microcrystalline quartz (SiO₂), likely orange chalcedony/carnelian

Diorite (Gneissic)

Diorite

Sandstone

Arenite (composed primarily of SiO2)

Nacre (Mother of Pearl)

Nacre (Biogenic Aragonite/Calcite composite, CaCO3)

Coquina

Bioclastic Limestone (composed primarily of CaCO3)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Granite

Granite (Mainly Quartz SiO2, Feldspar KAlSi3O8, and Mica KAl2(AlSi3O10)(OH)2)

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

Fossil coral in limestone

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

Coquina

Biogenic Limestone (Coquina)

Faceted glass-like gemstone object

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

Multicolor quartz bead bracelet

Quartz (silicon dioxide, SiO₂); bead colors may be from different varieties or treated quartz

Pink Granite

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

Amber (likely a small polished amber piece)

Natural fossil resin; amber is an organic mineraloid, not a crystalline mineral. The image alone cannot confirm authenticity.

Crushed Stone / Gravel

Aggregatus saxum (variable mineral composition)

Decorative gemstone bracelet or jewelry

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

Dark rounded pebble, likely basalt or slag

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

Sandstone

Arenite (SiO2 based clastic rock)

Chalk

Calcium carbonate (CaCO3)

Diamond

Carbon (C)

Diamond

Carbon (C)

Green Aventurine

Quartz (SiO2) with Fuchsite inclusions

Fossilized Coral (Coquina/Limestone)

Cnidaria Anthozoa (Fossilized)

Polished jasper pendant

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