Man Made Object (Coin)

Opalite (a synthetic glass, often confused with Opal)

Silicon dioxide glass (SiO2nH2O, for natural opal)

Iron meteorite (likely an etched or weathered display specimen)

Iron meteorite, composed chiefly of kamacite and taenite (Fe–Ni alloys)

Banded Calcite (Onyx Marble)

Calcite (CaCO3) / Travertine

Honey calcite

Calcite (calcium carbonate, CaCO₃)

Howlite

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Polished blue chalcedony (possibly agate)

Microcrystalline quartz, SiO₂; chalcedony, potentially banded agate

Red jasper (likely)

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored by iron oxides

Tumbled red jasper

Microcrystalline quartz (chalcedony), primarily SiO₂, colored by iron oxides

Black beaded bracelet, likely black onyx or glass

Possibly chalcedony (microcrystalline quartz, SiO₂); the beads may instead be man-made glass

Blue chalcedony cabochon (probable)

Chalcedony, a cryptocrystalline variety of quartz; silicon dioxide, SiO₂

Banded Calcite (Onyx Marble)

Calcite (CaCO3) / Travertine

Polished brecciated jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with iron-oxide-rich breccia fragments and cement

Sandstone (Water-worn Cobble)

Arenite (SiO2 with CaCO3 or Fe2O3 cement)

Amber-set ring

Amber (fossilized plant resin; organic mineraloid), set in a metal ring

Calcite

Calcium Carbonate (CaCO3)

Polished brown jasper (probable picture jasper)

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

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

Calcite (Calcium Carbonate, CaCO3)

Unknown White Specimen

Unidentifiable due to blurriness

Quartz-rich stone, possibly calcite or quartz

Likely quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing

Green Aventurine

Quartz (SiO2) with Fuchsite inclusions

Cullet Glass (Man-made Glass Slag)

Amorphous Silica (SiO2) with chemical additives

Banded Marble (Egg Carving)

Metamorphic crystalline limestone (predominantly Calcite, CaCO3)

Banded Calcite (Green Onyx / Onyx-Marble)

Travertine / Calcite (CaCO3)

Chalcedony (likely blue agate) knapped into an arrowhead

Microcrystalline quartz, SiO₂ (chalcedony)

Probable amber fragment

Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)

Cobalt Glass Slug (Man-made Glass)

Amorphous Silica with Cobalt Oxide (SiO2 + CoO)

Howlite

Hydrated calcium boro-silicate (Ca2B5SiO9(OH)5)

Polished black stone pendant

Likely black obsidian or black tourmaline; exact identification is uncertain from the photograph

Likely banded obsidian or dark volcanic glass

Obsidian, predominantly rhyolitic volcanic glass (SiO₂-rich), possibly with devitrified bands and phenocrysts

Chrysocolla

Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O

N/A (Non-Geological Object)

Orange Calcite

Calcium Carbonate (CaCO3)

Polished jasper, likely orbicular or brecciated jasper

Jasper: microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides and other inclusions

Honey calcite (likely rough cleavage fragment)

Calcite, calcium carbonate (CaCO₃)

Blue-green calcite

Calcite (CaCO₃), likely a pale aqua variety

Silver

Ag (Native Silver)

Likely fossilized coral with polished blue calcite or aragonite specimen

Fossil coral, commonly Scleractinia; blue material likely dyed or treated calcite/aragonite

Red glassy cabochon, likely synthetic ruby or red glass

Uncertain; possible synthetic corundum (Al₂O₃, chromium-colored) or man-made glass

Tumbled opalite (likely synthetic glass)

Opalite; typically man-made opalescent soda-lime glass, not a recognized mineral species

Granodiorite

Granodiorite

Goldstone (likely blue-free synthetic goldstone pendant)

Synthetic aventurine glass; silica glass with dispersed metallic copper crystals

Orange Calcite (Polished Sphere)

Calcium Carbonate (CaCO3)