Non Geological

Likely chrysocolla-bearing rock (blue-green copper mineral)

Chrysocolla, Cu₂H₂O₅Si (often mixed with malachite, quartz, or iron oxides)

Polished gray-brown stone, likely soapstone or marble

Steatite (talc-rich soapstone) or calcitic marble; exact identification is uncertain from the image

Likely serpentine-rich greenstone

Serpentinite/serpentinized ultramafic rock; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), possibly with chlorite, talc, magnetite, or epidote

Mahogany Obsidian

Obsidian (Volcanic Glass) with Hematite or Magnetite inclusions, SiO2 (Silicon Dioxide)

Shungite

Non-crystalline carbonoid (Shungite)

Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)

Quartzite

Metamorphic Quartzite (SiO2)

Fossils in Limestone (Crinoid / Marine Invertebrate Fossil)

Fossiliferous Limestone (containing Crinoidea / Brachiopoda)

Man-made Synthetic Material (Plastic/Composite)

Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)

Obsidian

Obsidian (Volcanic glass, primarily SiO2)

Mahogany Obsidian

Volcanic Glass with Hematite/Magnetite inclusions (SiO2 + Fe2O3)

Apache Tear

Obsidian (Hydrated Volcanic Glass - SiO2)

Obsidian

Volcanic glass (high silica content, usually >70% SiO2)

Note: Item is a Synthetic/Man-made Object

Titanium-coated Stainless Steel (Fe-Cr-Ni-Ti)

Quartzite

Metamorphic Quartzite (primarily SiO2)

Weathered iron-rich rock, likely limonite/goethite-bearing basalt or ironstone

Limonite (hydrated iron oxides; chiefly goethite, FeO(OH)) with probable silicate host rock

Sapphire

Corundum (Al2O3)

Baroque cultured pearl necklace

Pearl: nacre composed mainly of aragonite (CaCO₃) and conchiolin

Tumbled green aventurine (probable)

Quartzite composed mainly of quartz (SiO₂), colored by fuchsite or other mica inclusions

Chrysoprase- or serpentine-bearing quartz vein with pyrite

Quartz (SiO₂) with iron sulfide, chiefly pyrite (FeS₂), in altered Mg-rich rock; green material may be serpentine or nickel-bearing chalcedony

Man-made Metal Pin (Non-geological)

Antimony-Lead Alloy or Zinc/Brass Base with Electroplating

Jasper

Microcrystalline Quartz (SiO2)

Quartzite

Metamorphic Quartz Rock (SiO2)

Obsidian

Volcanic Glass (70-75% SiO2 with MgO and Fe3O4)

Snowflake Obsidian

Volcanic glass with Cristobalite inclusions (mostly SiO2)

Likely obsidian (possibly tektite or slag glass)

Volcanic glass; primarily SiO₂, noncrystalline

Black Obsidian

Volcanic Glass (predominantly SiO2, Silicon Dioxide)

Quartzite

Metamorphic Quartz Arenite

Pearl

Calcium carbonate (CaCO3) in the form of aragonite

Quartzite

Metamorphic Quartz Rock, SiO2

Orbicular Jasper

Silicon Dioxide (SiO2)

Moonstone with Black Tourmaline

Orthoclase (KAlSi3O8) with Schorl inclusions (NaFe3Al6(BO3)3Si6O18(OH)4)

Corundum (Sapphire / Raw Sapphire)

Aluminum Oxide (Al2O3)

Corundum (Sapphire/Ruby in Matrix)

Corundum (Al2O3)

Vesicular basalt

Basalt; predominantly plagioclase feldspar, pyroxene, and possible olivine

Quartz / Calcite Pebble (Indeterminate due to severe blur)

SiO2 (Quartz) or CaCO3 (Calcite)

Blue sapphire (likely synthetic or treated corundum)

Corundum, aluminum oxide (Al₂O₃), blue from iron and titanium impurities

Obsidian (likely Apache tear or flaked obsidian)

Volcanic glass; primarily rhyolitic silica glass (SiO₂-rich, non-crystalline)

Polished dendritic opal or common opal

Opal, hydrated amorphous silica (SiO₂·nH₂O), likely dendritic common opal

Obsidian

Volcanic glass (Mainly SiO2)

Fossil Coral (Petoskey / Horn Coral Sliced Button)

Scleractinia / Rugosa (Silurian-Devonian Anthozoa)

Quartzite

Metamorphic Quartzite (SiO2)