Anthropogenic Specimen (Man Made Material)

Sandstone Concretion

Clastic Sedimentary Rock (primarily SiO2 with mineral cement)

Diamond (Cut jewelry specimen)

Diamond (pure Carbon, C)

Polished blue stone, likely sodalite or dyed agate

Sodalite: Na₈(Al₆Si₆O₂₄)Cl₂; exact identification requires testing

Iron Slag

Ferrous slag (primarily silicates and oxides of calcium, iron, and magnesium)

Aura Quartz (Titanium/Gold coated)

Silicon Dioxide (SiO2) with metallic vapor deposition

Cullet Glass (sometimes mistaken for Blue Obsidian or Slag)

Amorphous Silicon Dioxide (SiO2) with chemical additives (e.g., Cobalt for blue color)

Petrified Wood

Silicified Wood (primarily SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Opalite

Synthetic Glass, SiO2 base with metallic inclusions

Cubic Zirconia (Simulated Diamond)

Cubic Zirconia (ZrO2)

Bituminous Coal (with Anthracite or Vitrinite inclusion)

Organic-rich Sedimentary Rock (Carboniferous classification)

Asphalt (Bituminous Pavement Bit)

Bitumen-bound aggregate (Petrochemical-bound composite)

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Chert (Arrowheads)

Microcrystalline Quartz (SiO2)

N/A - Man-made object (Jewelry Chain)

Antiqued or Oxidized Metal Chain (often Steel or Brass)

Chert (Common Variety, Jasper)

Microcrystalline Quartz (SiO2)

Black Obsidian

Amorphous volcanic glass (SiO2 + impurities)

Diamond

Carbon (C)

Chert (Yellow Jasper)

Cryptocrystalline Quartz (SiO2)

Conglomerate

Conglomerate Rock (Paraconglomerate)

Sandstone Concretion

Clastic sedimentary rock (primarily Quartz SiO2)

Green Aventurine

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Tumbled epidote-bearing rock (likely epidote–quartz–feldspar aggregate)

Epidote-rich metamorphic rock; minerals likely epidote (Ca₂(Al,Fe)₃Si₃O₁₂(OH), quartz, feldspar, and dark amphibole/biotite)

Granodiorite

Granodiorite

Sea Glass (Uranium/Vaseline Glass variant)

Silicon Dioxide (SiO2) with trace Uranium Oxide (U3O8)

Aura Quartz

Titanium/Titanium-Gold treated Silicon Dioxide (SiO2)

Red Slag Glass

Amorphous Silica (Industrial byproduct with metallic oxide dopants)

Quartzite Arrowhead (Archaeological Lithic)

Recrystallized Quartz (SiO2)

Blue Goldstone

Man-made glass with suspended copper, cobalt, or manganese particles

Goldstone (Red/Brown)

Aventurine Glass (SiO2 with Copper inclusions)

Small dark mineral/rock fragment

Indeterminate; possibly magnetite-bearing basalt or iron-rich slag

Weathered chert or chalcedony nodule

Microcrystalline quartz (SiO₂), possibly silicified limestone or agate-like chalcedony

Granite with Cupules / Bedrock Mortars

Granite (felsic intrusive plutonic rock)

Green Glass (often marketed as 'Obsidian' or 'Green Quartz')

Amorphous Silica (SiO2) with copper or chromium additives

Chert (and/or Flint)

Chert (Cryptocrystalline variety of Quartz, SiO2)

Diorite (River Pebble)

Intermediate Phaneritic Igneous Rock

Carborundum (Silicon Carbide)

Silicon Carbide (SiC) / Moissanite (natural form)

Tree Agate

Chalcedony (SiO2)

Ferrochrome Slag

Industrial Glassy Slag (Fe-Cr alloy byproduct)

Dark rounded pebble, likely basalt or slag

Probable fine-grained mafic rock; possibly basalt (plagioclase–pyroxene) or industrial iron/steel slag

Banded Sandstone

Arenite with Liesegang banding