Mineral (Man Made Composite)

Polished silver sheen obsidian heart

Obsidian (volcanic glass), primarily rhyolitic silica-rich glass

Dyed Aura Quartz

Silicon Dioxide (SiO2) with metallic coating

Chert Concretion (with typical hematite/limonite staining)

Sedimentary Concretion (SiO2 with FeO(OH)⋅nH2O)

Titanium Amethyst Geode

Silicon Dioxide (SiO2) with Titanium/Metal Vapor Deposition Layer

Green glass sphere/marble

Soda-lime glass (primarily SiO2, Na2O, CaO)

Slag

Ferrous Slag (Amorphous calcium-magnesium-aluminum silicates)

Goldstone (Brown)

Aventurine Glass (Silicon Dioxide infused with Copper crystals)

Conglomerate

Conglomerate (Sedimentary rock containing rounded clasts)

Sandstone Concretion

Clastic sedimentary rock (primarily Quartz SiO2)

Carborundum

Silicon Carbide (SiC)

Milky quartz (rough fragment)

Quartz, silicon dioxide (SiO₂)

Rock crystal (clear quartz), possibly cloudy quartz

Quartz, silicon dioxide (SiO₂)

Hematite

Iron(III) oxide (Fe2O3)

Polished black pebble, likely basalt

Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, commonly with olivine

Granite with Cupules / Bedrock Mortars

Granite (felsic intrusive plutonic rock)

Dyed Blue Agate (Dragon Vein Agate)

Silicon Dioxide (SiO2) with artificial cobalt/organic dyes

Diamond

Native Carbon (C)

Red-orange jasper pebble (tentative)

Microcrystalline quartz, SiO₂, colored mainly by iron oxides

Weathered iron-rich concretion or ironstone nodule

Goethite–hematite limonite concretion (FeO(OH), Fe₂O₃, and hydrated iron oxides)

Turquoise-style beaded bracelet

Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; possibly dyed or composite beads

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

Blue Obsidian (Cullet Glass)

Silicon Dioxide (Amorphous Glass)

Green glassy mineral fragment, possibly fluorite

Fluorite (calcium fluoride, CaF₂), tentative identification

Ceramic or Polished Stone Heart (Anthropogenic Material)

Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)

Sea Glass (specifically Frosted White)

Amorphous Silica (substance: Sodium-calcium silicate glass)

Opalite

Synthetic Opalized Glass

Raw quartz crystal

Quartz (silicon dioxide, SiO₂), likely milky or included quartz

Metallic sulfide mineral fragment, likely galena

Galena (lead sulfide, PbS), tentative identification

Blue glassy gemstone cabochon, likely dyed chalcedony or glass

Uncertain; possible dyed chalcedony (microcrystalline quartz, SiO₂)

Carborundum (Silicon Carbide)

Silicon Carbide (SiC) / Moissanite (natural form)

Tumbled milky chalcedony (likely common opalite-like quartz)

Chalcedony, microcrystalline SiO₂; possibly pale common opal, hydrated SiO₂·nH₂O

Colorless quartz crystal (likely quartz fragment)

Quartz, silicon dioxide (SiO₂)

Blue sea glass or blue glassy mineral fragment

Uncertain; likely man-made soda-lime glass, not a natural mineral

Blue glassy fragment among beach gravel

Likely cobalt-blue man-made glass; not a natural mineral specimen

Purple glassy pebble, possibly slag glass

Unidentified; likely man-made glass rather than a natural mineral

Green sea glass (likely slag glass or bottle glass)

Man-made soda-lime silicate glass; not a naturally occurring mineral

Diamond

Carbon (C)

Carborundum (Silicon Carbide)

Silicon Carbide (SiC)

Goldstone (Red)

Aventurine Glass (SiO2 + Cu)

Polished black stone, likely black obsidian

Volcanic glass; predominantly rhyolitic silica glass (SiO₂-rich)

Dyed Agate / Painted Stone

Silicon Dioxide (SiO2) with artificial pigment

Opalite

Synthetic Fluorescent Glass (SiO2 + impurities)