Mineral (Synthetic Glass)

Green sea glass (likely bottle glass)

Man-made soda–lime silicate glass; not a natural mineral

Blue Glass or Slag Glass

Amorphous Silica (Anthropogenic Glass)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Snowflake obsidian cabochon

Obsidian (volcanic glass), SiO₂-rich; white areas are cristobalite/spherulitic devitrification

Green Aventurine

Aventurine Quartz (SiO2 + Fuchsite mica)

Green Aventurine

SiO2 (Silicon Dioxide with Fuchsite inclusions)

Snowflake Obsidian

Spherulitic Obsidian (Amorphous Volcanic Glass with Cristobalite inclusions)

Quartz with Muscovite Mica

SiO2 with KAl2(AlSi3O10)(OH)2

Obsidian

Obsidian (Volcanic glass, primarily SiO2)

Likely polished quartz or glass-like mineral cabochon

Probably quartz (SiO₂), though the image cannot exclude man-made glass

Blue goldstone

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

Muscovite Mica Schist

Muscovite Schist (KAl2(AlSi3O10)(OH)2)

Muscovite Schist

Mica Schist (primarily KAl2(AlSi3O10)(OH)2)

Green glassy mineral specimen, likely nephrite or serpentine

Indeterminate from image; possible nephrite jade (interlocking amphibole, chiefly Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂) or green serpentine (Mg₃Si₂O₅(OH)₄)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Pink Quartz / Sea Glass

Silicon Dioxide (SiO2)

Snowflake Obsidian

Spherulitic Obsidian (primarily SiO2 with Cristobalite inclusions)

Blue slag glass or dyed glass-like industrial material

Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass

Tumbled green-blue glassy mineral, possibly fluorite or aventurine

Uncertain from image; possible fluorite (CaF₂) or quartz aventurine (SiO₂)

Snowflake Obsidian

Obsidian with Cristobalite inclusions (SiO2)

Likely polished dark stone or glassy mineral bead

Indeterminate; possibly obsidian, hematite, or a dark agate

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Quartzite

Quartzite (SiO2)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Green sea glass (likely slag glass or bottle glass)

Man-made soda-lime silicate glass; not a naturally occurring mineral

Quartz in Host Rock

Silicon Dioxide (SiO2)

Quartz with Iron Staining

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Tumbled green aventurine (probable)

Quartz variety: aventurine quartz, SiO₂, colored commonly by fuchsite mica

Snowflake Obsidian

Obsidian with Cristobalite inclusions (SiO2)

Polished mahogany obsidian

Volcanic glass; rhyolitic obsidian, commonly with iron-oxide coloration

Small gray translucent stone, possibly quartz or glassy mineral

Uncertain; likely microcrystalline quartz (SiO₂), but the image is insufficient for definitive identification

Tumbled black stone, likely black obsidian

Obsidian — natural volcanic glass, predominantly silica-rich rhyolitic composition

Green sea glass or tumbled green quartz (uncertain)

Likely quartz (SiO₂) if natural; alternatively man-made soda-lime glass

Likely tumbled red mineral or glass imitation

Indeterminate; possibilities include red jasper (microcrystalline quartz, SiO₂) or dyed chalcedony

Snowflake Obsidian

Obsidian with Spherulitic Cristobalite (SiO2)

Snowflake obsidian

Volcanic glass (obsidian), chiefly silica-rich rhyolitic composition, with cristobalite or feldspar spherulites

Pink potassium feldspar (orthoclase/microcline)

KAlSi₃O₈; likely massive potassium feldspar, possibly with quartz

Snowflake Obsidian

Volcanic Glass with Cristobalite Inclusions

Milky quartz (likely rough quartz crystal)

Quartz, silicon dioxide (SiO₂)

Green glassy stone, possibly aventurine or green jade

Unidentifiable from the image; possible quartz-rich aventurine (SiO₂) or jadeite/nephrite

Sea Glass (Frosted Quartz/Glass)

Amorphous Silicon Dioxide (SiO2)