Man Made Rock Like Material

Green Glass Slag

Amorphous Silicon Dioxide (SiO2) with metal oxide impurities

Sandstone

Arenite (composed primarily of SiO2)

Opalite

Synthetic Glass (Hydrated Crystalline Silicon Dioxide simulation)

Orange glassy slag (industrial by-product)

Iron-rich silicate glass; composition varies, commonly Fe–Ca–Al silicate

Green sea glass or tumbled green quartz (uncertain)

Likely quartz (SiO₂) if natural; alternatively man-made soda-lime glass

Coquina / Fossiliferous Limestone

Calcareous bioclastic sedimentary rock (CaCO3)

Granite

Granite (a plutonic rock)

Green Agate

Silicon dioxide (SiO₂)

Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')

Calcite (Calcium Carbonate, CaCO3)

Pink Quartz / Sea Glass

Silicon Dioxide (SiO2)

Sandstone (specifically Arkose or Quartz Arenite)

Arenite (primarily SiO2 with possible Feldspar)

Chert (specifically Flint Arrowhead)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Blue goldstone

Man-made aventurine glass containing metallic copper particles; not a natural mineral

Chert (Chert / Flint Variety)

Microcrystalline / Cryptocrystalline Quartz (SiO2)

Tumbled amber-colored chalcedony or jasper

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper

Blue Goldstone

Synthetic Aventurescent Glass (Cobalt-doped soda-lime glass)

Beaded gemstone bracelet

Indeterminate; likely small polished mineral beads, possibly turquoise or dyed stone, with metal and glass components

Limpets Shell / Fossil Specimen

Patellogastropoda (Class)

Chert (often called Flint in archaeological contexts)

Silicon Dioxide (SiO2)

Sandstone (Water-worn Cobble)

Arenite (SiO2 with CaCO3 or Fe2O3 cement)

Opalite

Synthetic Glass (Simulated Moonstone/Opal)

Red-and-brown agate bead bracelet

Agate, a microcrystalline variety of quartz (SiO₂), likely colored chalcedony/carnelian

Coquina

Coquina (Bioclastic Limestone)

Tumbled opalite (likely man-made glass)

Opalite, a trade name for opalescent glass; not natural opal

Chert or Jasper

Microcrystalline Quartz (SiO2)

Green glassy slag (often sold as “sea glass” or “green obsidian”)

Industrial vitreous slag; primarily amorphous silicate glass, composition variable

Granite / Diorite (Granodiorite)

Granodiorite / Quartz Diorite

Clear quartz crystal (likely)

Quartz, silicon dioxide (SiO₂)

Opalite

Synthetic Opalized Glass

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Chert (Nodule/Pebble)

Chert (Silicon Dioxide, SiO2)

Pumice

Pumice (Vesicular volcanic glass)

Polished jasper pebble

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with possible iron-oxide and other mineral inclusions

Coquina

Biogenic Limestone (Calcium Carbonate, CaCO3)

Ruby in Matrix

Corundum (Al2O3)

Diamond Druzy (Crystalline Diamond)

Carbon (C)

Diamond (in a gold ring)

Diamond (pure carbon, C)

Titanium Aura Quartz (Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2)

Industrial Slag

Anthropogenic Vitreous Slag

Chert (variations include Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Red-orange sunstone (likely aventurine feldspar) bead bracelet

Feldspar, commonly oligoclase or labradorite with copper inclusions; composition varies by source