Man Made Object (Metalwork)

Chalk

Micrite (primarily Calcium Carbonate, CaCO3)

Polished dendritic agate or jasper pebble

Microcrystalline quartz (chalcedony), SiO₂, with dark manganese-oxide inclusions

Tumbled/cut citrine quartz point

Quartz, silicon dioxide (SiO₂), likely heat-treated amethyst sold as citrine

Quartz pebble in concrete

Quartz (SiO₂), embedded in Portland-cement concrete

Diamond (in Jewelry Setting)

Carbon (C)

Asphalt Pavement (with aggregate)

Asphalt concrete

Blue Slag Glass

Amorphous Silica (Byproduct of smelting)

Cardstock (Paper)

Cellulose (C6H10O5)n

Blue Goldstone

Aventurine Glass (SiO2 with Cobalt/Copper inclusions)

Synthetic Resin (Artificial Specimen)

Polyurethane or Polyester Resin

Slag Glass (Cullet)

Amorphous Silicon Dioxide (SiO2) with metal oxide colorants

Slag (Anthropogenic Glass/Iron byproduct)

Ferro-silicate Slag

Artisanal Glass Beads (Simulated Goldstone or Aventurine Glass)

Silicon Dioxide (SiO2) with metallic inclusions

Cut colorless gemstone, likely quartz or glass imitation

Most plausibly rock crystal (clear quartz, SiO₂); synthetic glass cannot be ruled out from the image

Speckled rounded stone, possibly basalt or diorite

Indeterminate mafic/intermediate igneous rock; likely fine-grained basaltic or dioritic material

Fossilized bivalve in sandstone/conglomerate

Indeterminate fossil mollusk, likely Bivalvia, preserved in lithified siliciclastic sediment

Small polished metallic mineral specimen

Indeterminate from image; possibly galena or hematite

Tumbled orange chalcedony or quartzite

Microcrystalline quartz (SiO₂), possibly iron-stained chalcedony; exact identification requires testing

Ammonite fossil

Fossilized ammonoid cephalopod; likely an involute ammonite, exact genus/species indeterminate

Polished agate/geode fragment

Chalcedony (microcrystalline quartz, SiO₂) with quartz and probable iron/manganese oxides

Tumbled labradorite

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

Fossil tooth, likely shark tooth

Fossilized selachian tooth, possibly Carcharodon or a related lamniform shark

Optical Calcite

Calcium Carbonate (CaCO3)

Quartz pebble or seed/crumb

SiO2 (if quartz)

Yellow Sapphire (Raw)

Corundum (Al2O3)

Mixed small pebbles and mineral grains

Unidentified detrital sediment; likely quartz-, feldspar-, and lithic fragments

Sea Glass

Amorphous Silicon Dioxide (SiO2)

Crackle Glass (Simulated Gemstone)

Amorphous Solid (SiO2)

Blue Goldstone

Synthetic glass with copper or cobalt/manganese inclusions

Blue Goldstone

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

Blue Goldstone

Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)

Green Glass Slag

Amorphous Silicon Dioxide (SiO2) with metal oxide impurities

Porcelain (Stoneware Ceramic)

Mullite / Silica-glass composite (Al6Si2O13)

Glass Nugget (Tumbled Glass)

Amorphous Silicon Dioxide (SiO2) with additives

Goldstone (Brown)

Aventurine glass

Blue slag glass / industrial smelter slag

Man-made iron-rich silicate slag; composition variable, commonly Fe–Ca–Mg–Al silicates with glassy phases

Flint/chert projectile point

Microcrystalline quartz (SiO₂), archaeologically worked into a bifacial point

Rounded quartz pebble (tentative)

Quartz, silicon dioxide (SiO₂)

Polished ocean jasper cabochon

Orbicular jasper (microcrystalline quartz, SiO₂)

Green cabochon gemstone, likely glass-filled or synthetic emerald imitation

Uncertain; possible synthetic emerald (beryl, Be₃Al₂Si₆O₁₈) or green glass

Diamond (or Cubic Zirconia simulant)

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

Moissanite

Silicon Carbide (SiC)