Not A Natural Rock (Man Made Composite)

Tiger Iron

Composite rock (Quartz, Tiger's Eye, Hematite, and Jasper)

Unakite

Altered Granite (Epidotized Granite)

Unakite

Altered Granite (Epidotized Granite)

Likely tumbled or cut quartz/chalcedony fragment

Silicon dioxide (SiO₂), probably microcrystalline quartz or quartz

Cobalt Glass Slug (Cullet)

Man-made Silicate Glass with Cobalt Oxide (CoO)

Titanium Aura Quartz (Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2)

Obsidian

Volcanic Glass (Amorphous Silicon Dioxide)

Sea Glass

Man-made vitreous material (silica-based glass)

Sea Glass

Man-made silicate glass (Amorphous silicon dioxide)

Carved turquoise arrowhead/pendant

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

Polished labradorite sphere

Labradorite, calcic plagioclase feldspar ((Ca,Na)(Al,Si)₄O₈)

Polished labradorite pendant

Labradorite, a calcium-rich plagioclase feldspar (approximately NaAlSi₃O₈–CaAl₂Si₂O₈)

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

Copper Composite Turquoise (Purple and Blue)

Composite Hydrous copper aluminum phosphate with bronze/copper matrix binding

Sandstone

Clastic sedimentary rock (Quartz arenite/Arkose)

Sandstone

Sandstone (clastic sedimentary rock, predominantly SiO2)

Diamond (or Cubic Zirconia simulant)

Carbon (C) - Diamond / Zirconium dioxide (ZrO2) - CZ

Unakite

Unakite (Altered Granite composed of Orthoclase KAlSi3O8, Epidote Ca2(Al, Fe)3(SiO4)3(OH), and Quartz SiO2)

Red Sandstone or Brick Fragment

Arenite (if sandstone)

Diamond (in a jewelry setting)

Carbon (C)

Polished orbicular jasper (likely ocean jasper)

Siliceous microcrystalline quartz/chalcedony with iron-oxide and volcanic inclusions; commonly called ocean jasper

Green Slag

Anthropogenic Silicate Glass

Chalk

Micrite (primarily Calcium Carbonate, CaCO3)

Bismuth

Bismuth (Bi)

Goldstone (blue-goldstone–style glass) beads

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

Asphalt aggregate

Human-made bituminous asphalt containing crushed silicate rock aggregate

Turquoise cabochon

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; likely stabilized or matrix-bearing

Chalcanthite (Likely Synthetic/Lab-Grown)

Hydrated copper(II) sulfate (CuSO4·5H2O)

Black-and-white agate geode pendant

Agate (microcrystalline quartz, SiO₂), likely a hollow geode slice with chalcedony and drusy quartz

Milky quartz (rough quartz fragment)

Quartz, silicon dioxide (SiO₂)

Goldstone (Synthetic Aventurescence Glass)

Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)

Polished brown jasper (likely brecciated or orbicular jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and other mineral inclusions

Ruby zoisite (anyolite)

Zoisite with corundum (ruby) and commonly amphibole; Ca₂Al₃(SiO₄)₃(OH)

Sandstone

Arenite

Polished/tumbled stone, likely serpentine or agate

Probable serpentine-group mineral (antigorite/lizardite), possibly a green jasper or agate; image is insufficient for certainty

Banded Sandstone

Arenite with Liesegang banding

Pale green aventurine (likely quartz) sphere

Quartz, SiO₂; possibly pale green aventurine, with color from inclusions or treatment

Turquoise

Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O

Crackle Glass (Simulated Gemstone)

Amorphous Solid (SiO2)

Blue Glass or Slag Glass

Amorphous Silica (Anthropogenic Glass)

Agate (Dyed) or composite stone

SiO2

Malachite cabochon or polished bead

Malachite, Cu₂CO₃(OH)₂