Mineral (Man Modified)

Diamond (as set in a gold ring)

Carbon (C)

Turquoise

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

Opalite

Synthetic Glass (Hydrated Crystalline Silicon Dioxide simulation)

Titanium Coated Kyanite (Aura Kyanite)

Aluminosilicate (Al2SiO5) with a Titanium-Niobium vacuum-deposited coating

Concrete Fragment

Hardened Portland Cement Composite

Chert Concretion

Chert (Microcrystalline Quartz, SiO2)

Dalmatian Stone

Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)

Engineerged Quartz (Quartz Composite)

SiO2 (Silicon Dioxide) in a polymer resin matrix

Sea Glass

Amorphous silicon dioxide (man-made glass weathered by nature)

Polymer Clay (Mock Mineral)

Polyvinyl chloride (PVC) with plasticizers and pigment

Rock crystal quartz fragments

Quartz (silicon dioxide, SiO₂)

Cullet (Slag Glass)

Amorphous Silica (SiO2) with various metal oxide colorants

Chert

Microcrystalline Quartz (SiO2)

Slag

Metallurgical Slag

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Green glass-like mineral specimen, likely fluorite

Fluorite (calcium fluoride, CaF₂), if natural; appearance may also indicate colored glass

White quartz pebble or chip

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Unidentified translucent crystal/mineral fragment

Likely quartz (SiO₂), but visual identification is uncertain

Tumbled white chalcedony (likely milky quartz)

Chalcedony, microcrystalline quartz (SiO₂)

Mohave Turquoise (Composite/Stabilized)

Hydrated copper aluminium phosphate (CuAl6(PO4)4(OH)8·4H2O) with stabilizing resin and metallic inclusions

Rough Diamond

Native Carbon (C)

Diamond (in a cluster setting)

Crystallized Carbon (C)

Sandstone Concretion

Clastic Sedimentary Concretion (SiO2 with Iron Oxide)

Clear quartz crystal (likely)

Quartz, silicon dioxide (SiO₂)

Sandstone Concretion

Sedimentary Clastic Rock (Silicate-rich)

Tumbled gray stone, likely quartz-rich pebble

Probable microcrystalline quartz/chalcedony (SiO₂), possibly gray jasper or quartzite

Likely tumbled or cut quartz/chalcedony fragment

Silicon dioxide (SiO₂), probably microcrystalline quartz or quartz

Black tumbled stone, possibly obsidian

Obsidian (volcanic glass; predominantly SiO₂), identification uncertain from image

Decorative mosaic cross containing mixed rock and glass fragments

Polychrome aggregate; likely quartz, feldspar, marble, granite, and assorted colored glass

Unidentifiable Rock Fragment

Green sea glass (likely bottle glass)

Man-made soda–lime silicate glass; not a natural mineral

Green sea glass (likely bottle glass)

Man-made soda-lime silicate glass; not a natural mineral

Likely tumbled red mineral or glass imitation

Indeterminate; possibilities include red jasper (microcrystalline quartz, SiO₂) or dyed chalcedony

Opalite

Synthetic Glass (SiO2 + impurities)

Opalite

Synthetic Glass (typically Silica/Magnesium based with metal additives)

Silicon Carbide (Carborundum)

Silicon Carbide (SiC) / Moissanite (natural)

Opalite-style glass pendant

Man-made opalescent glass (not natural opal)

Aggregate Concrete

Anthropogenic Conglomerate (Technosol)

Sandstone (with Liesegang rings or joints)

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide cement)

Diamond Druzy (Crystalline Diamond)

Carbon (C)

Diamond

Diamond (pure native carbon, C)

Sandstone (with concrete/human-made layer)

Clastic Sedimentary Rock (primarily Quartz/Feldspar grains)