Man Made Glass (Often Grouped With Minerals In Lapidary)

Polished labradorite sphere

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

Sandstone (with concrete/human-made layer)

Clastic Sedimentary Rock (primarily Quartz/Feldspar grains)

Dalmatian Stone

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

Magnetic Hematite (Man-made)

Iron Oxide (Fe2O3) with Barium-Strontium Ferrite

Slag Glass (Leland Blue variant)

Anthropogenic Vitreous Silicate

Concrete

Anthropogenic Sedimentary Conglomerate (Cement mixture: typically Ca2SiO4, Ca3SiO5, Ca3Al2O6)

Opalite

Synthetic Fluorescent Glass (SiO2 + impurities)

Tumbled jasper (likely yellow/brecciated jasper)

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

Diamond (or Simulant)

Carbon (C)

Fossil coral

Fossilized colonial coral, likely rugose or tabulate coral preserved in limestone

Asphalt Concrete

Bituminous Concrete

Opalite (a synthetic glass, often confused with Opal)

Silicon dioxide glass (SiO2nH2O, for natural opal)

Concrete fragment with Aggregate

Anthropogenic Concrete with Calcarious and Siliceous Aggregate

Titanium Aura Quartz (Bismuth-coated Druzy)

Silicon Dioxide (SiO2) with Titanium/Metal vapor coating

Polished labradorite pendant

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

Titanium Coated Kyanite (Aura Kyanite)

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

Polished garnet bead bracelet

Garnet group, likely almandine–pyrope solid solution; commonly approximated as Fe₃Al₂(SiO₄)₃–Mg₃Al₂(SiO₄)₃

Sea Glass

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

Green Slag Glass

Cullet (Amorphous Silicon Dioxide with impurities)

Concrete / Conglomerate (Man-made)

Artificial Conglomerate (Cementitious Composite)

Milky quartz (rough fragment)

Quartz, silicon dioxide (SiO₂)

Colorless quartz crystal (likely quartz fragment)

Quartz, silicon dioxide (SiO₂)

Cherry Quartz

SiO2 (Silicon Dioxide with iron-rich inclusions/dye)

Blue tumbled glass-like specimen; likely blue slag glass

Likely man-made glass (silicate glass), not a natural mineral; exact material cannot be confirmed from the image

Chert Arrowhead (Projectile Point)

Microcrystalline Quartz (Chert or Flint)

Sea Glass

Amorphous Silicon Dioxide (Man-made glass weathered by nature)

Polished silver sheen obsidian heart

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

K-feldspar (Potassium Feldspar)

Potassium Feldspar (KAlSi3O8)

Sea Glass (White/Clear)

Amorphous Silica (Alkali-Lime-Silica Glass), SiO2 + Na2O + CaO

Blue Goldstone

Aventurine Glass (SiO2 with Cobalt/Copper inclusions)

Goldstone (likely red/brown aventurine glass)

Man-made aventurine glass; copper-bearing silicate glass (not a natural mineral)

Likely blue-green glassy slag or a weathered mineral fragment

Unidentified; the image does not show diagnostic features sufficient for a mineral identification

Black Obsidian

Amorphous volcanic glass (SiO2 + impurities)

Concrete with Exposed Aggregate

Anthropogenic conglomerate (Concrete)

Acrylic or Resin (Synthetic Imitation)

Polymethyl Methacrylate (PMMA) or Polyepoxide

Green sea glass (likely)

Anthropogenic glass, not a mineral; composition commonly soda–lime silicate glass

Concrete / Anthropogenic Conglomerate

Man-made composite material (Portland cement, aggregate, and water)

Blue glassy fragment among beach gravel

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

Silicon Carbide (Carborundum)

Silicon Carbide (SiC) / Moissanite (natural)

Asphalt Concrete (Bituminous Pavement)

Aggregates in Bitumen Matrix

Sandstone-based Concrete Fragment

Cementitious Composite with Sedimentary Aggregate

Sandstone Anvil / Nutting Stone

Quartzose Sandstone (Sedimentary Rock)