Man Made Glass (Not A Natural Rock Or Mineral)

Engineerged Quartz (Quartz Composite)

SiO2 (Silicon Dioxide) in a polymer resin matrix

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial byproduct)

Polished black pebble, possibly obsidian

Volcanic glass (obsidian), likely; identification is tentative from the image

Smelter Slag

Anthropogenic Silicate Slag

Libyan Desert Glass

Libyan Desert Glass (SiO2 with trace elements)

Goldstone (Brown/Gold)

Aventurine Glass (Man-made glass with Copper inclusions)

Titanium Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Blue goldstone

Man-made aventurine glass containing metallic copper particles; not a natural mineral

Goldstone (with Tiger's Eye and Quartz)

Aventurine glass (Synthetic SiO2 with Cu inclusions)

Blue glassy tumbled stone, likely blue chalcedony or slag glass

Chalcedony (microcrystalline SiO₂), possibly man-made blue glass

Obsidian (Blue)

Volcanic Glass (SiO2)

Sandstone Concretion

Sedimentary Concretion (Quartz-cemented sand)

Cherry Quartz

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

Strawberry Quartz

Silicon Dioxide (SiO2) with Hematite/Goethite inclusions

Opalite

Synthetic Glass (Hydrated Crystalline Silicon Dioxide simulation)

Green obsidian (likely molded or heat-treated glass-like specimen)

Volcanic glass; predominantly rhyolitic composition (silica-rich amorphous SiO₂)

Diamond

Native Carbon (C)

Crackled Quartz (Dyed)

Silicon Dioxide (SiO2)

Asphalt Concrete

Bituminous Concrete

Small rounded mineral pebble, possibly quartz

Uncertain; likely microcrystalline or crystalline SiO₂ (quartz), potentially with iron-oxide staining

Aura Quartz

Silicon Dioxide (SiO2) with metallic vapor coating

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz

Chakra Stone Tower (Composite Multi-Mineral)

Crystalline Silicon Dioxide composite (SiO2) with various inclusions

Carborundum (Silicon Carbide)

Silicon Carbide (SiC) / Moissanite (natural form)

Goldstone

Aventurine Glass (Man-made glass with copper inclusions)

Likely clear quartz crystal or glass-like gemstone

Quartz, silicon dioxide (SiO₂); exact identification is uncertain from the strongly magenta-lit image

Goldstone

Aventurine glass (Synthetic glass with copper inclusions)

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

Amorphous Silica (SiO2) with copper or chromium additives

Polished silver sheen obsidian heart

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

Raw quartz crystal

Quartz (silicon dioxide, SiO₂), likely milky or included quartz

Sea Glass

Man-made vitreous material

Blue cabochon gemstone, likely synthetic glass or dyed stone

Indeterminate from image; possible glass, synthetic spinel, sodalite, or lapis lazuli

Tumbled milky chalcedony (likely common opalite-like quartz)

Chalcedony, microcrystalline SiO₂; possibly pale common opal, hydrated SiO₂·nH₂O

Crescent Pebble

Weathered Quartzite or Sandstone Fragment

Mystic Topaz

Aluminum Silicate Fluoride Hydroxide (Al2SiO4(F,OH)2) with metallic film coating

Aura Quartz (Titanium/Gold coated)

Silicon Dioxide (SiO2) with metallic vapor deposition

Polished black stone, likely black obsidian

Volcanic glass; predominantly rhyolitic silica glass (SiO₂-rich)

Terrazzo (Man-made Composite)

Cementitious or Resin-bound Lithic Composite

Titanium-Coated Hematite (Aura Hematite)

Titanium-bonded Hematite (Fe2O3 with a Ti coating)

Diamond (or Cubic Zirconia)

Carbon (C) or Zirconium Dioxide (ZrO2)

Blue Goldstone

Synthetic Avanturine Glass (or Aventurine Glass)

Clear quartz sphere

Quartz (silicon dioxide, SiO₂)