Mineral (Synthetic Glass)

Multi-stone gemstone ring

Likely faceted blue topaz or synthetic blue stone with clear stones, possibly cubic zirconia or diamond; metal setting appears silver-colored alloy

Green sea glass or green glass-like tumbled material

Amorphous silicate glass; likely anthropogenic soda-lime glass, not a natural mineral

Faceted Glass (Costume Jewelry)

Amorphous Silicon Dioxide with colorants (Glass)

Goldstone (likely red/brown aventurine glass)

Man-made aventurine glass; copper-bearing silicate glass (not a natural mineral)

Green glassy slag or manufactured glass bead

Noncrystalline silicate glass; likely industrial glass/slag, not a true mineral

Snowflake Obsidian

Volcanic Glass with Cristobalite inclusions (SiO2)

Moldavite (rough fragment)

Natural impact glass, chiefly SiO₂ with Al₂O₃ and trace oxides; tektite

Snowflake Obsidian

Obsidian with Cristobalite inclusions

Shale with Vein Infillings

Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Tumbled amber-colored mineral or glassy pebble

Uncertain; likely chalcedony/quartz, possibly resinous amber or slag glass

N/A - Image is non-geological

Acrylonitrile Butadiene Styrene (ABS) or Polypropylene (PP)

Snowflake Obsidian

Volcanic Glass with Cristobalite inclusions (SiO2)

Fluorescent glassy mineral specimen, possibly hyalite opal

Hyalite (hydrated amorphous silica, SiO₂·nH₂O), tentative

Snowflake Obsidian

Spherulitic Volcanic Glass (primarily SiO2)

Clear quartz crystal (tentative)

Quartz, silicon dioxide (SiO₂)

Green glassy mineral fragment, possibly fluorite

Fluorite (calcium fluoride, CaF₂), tentative identification

Portable Ceramic Space Heater

Polished Acrylonitrile Butadiene Styrene (ABS) Plastic with Ceramic Heating Elements

Milky Quartz

Silicon Dioxide (SiO2)

Quartz with Muscovite Mica

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate Hydroxide (KAl2(AlSi3O10)(OH)2)

Snowflake Obsidian

Volcanic Glass (SiO2) with Cristobalite inclusions

Muscovite Mica

KAl2(AlSi3O10)(F,OH)2

Snowflake Obsidian (Polished Cabochon)

Obsidian with Spherulitic Cristobalite (SiO2)

Snowflake Obsidian

Hydrated Volcanic Glass with Cristobalite inclusions

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(F,OH)2)

Quartz (Clear/Milky)

Silicon Dioxide (SiO2)

Clear quartz crystal (likely)

Quartz, silicon dioxide (SiO₂)

Snowflake Obsidian

Volcanic Glass (SiO2 + impurities)

Tumbled quartz crystal

Quartz (silicon dioxide, SiO₂)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(F,OH)2)

Feldspar in Matrix

Feldspar group minerals in metamorphic or igneous matrix

Rounded quartz-rich pebble

Likely milky quartz or quartzite (SiO₂), identification uncertain from image

Muscovite Mica

Muscovite, KAl2(AlSi3O10)(OH)2

Snowflake Obsidian

Volcanic Glass with Cristobalite inclusions

Tumbled black stone, likely black obsidian

Obsidian (volcanic glass; chiefly silica-rich rhyolitic composition)

Asphalt (Bituminous Concrete)

Bituminous Concrete / Pavement

Snowflake Obsidian

Spherulitic Obsidian (Volcanic Glass with Cristobalite)

Snowflake Obsidian

Spherulitic Obsidian (Amorphous volcanic glass with Phenocrysts of Cristobalite)

Blue Slag Glass

Man-made Silicon Dioxide (Amorphous)

Snowflake Obsidian

Volcanic glass with Spherulite inclusions (SiO2)

Green Quartz / Chrysoprase / Sea Glass

Silicon Dioxide (SiO2)