Mineral (Synthetic Glass)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Raw Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Crystal)

Silicon Dioxide (SiO2)

Man-made earbud charging case (Not a rock or mineral)

Acrylonitrile Butadiene Styrene (ABS) Plastic with electronic components

Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Smoky quartz (likely)

Quartz, silicon dioxide (SiO₂), naturally irradiated variety

Small pale mineral fragment, likely quartz or calcite

Quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing

Quartz

Silicon Dioxide (SiO2)

Tumbled Quartz

Silicon Dioxide (SiO2)

Blue-green glassy mineral specimen, likely turquoise-colored fluorite or dyed material

Uncertain; possible fluorite (CaF₂), chrysocolla, or dyed calcite/glass

Obsidian

Obsidian (Volcanic Glass, SiO2 + impurities)

Ferruginous Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions (Limonite/Goethite)

Tumbled amethyst

Quartz, purple variety; silicon dioxide (SiO₂), colored mainly by iron impurities and irradiation

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Quartz with Schist Matrix

Crystalline Silicon Dioxide (SiO2) in micaceous schist

Tumbled blue chalcedony (likely blue quartz/chalcedony)

Cryptocrystalline silica, SiO₂; likely chalcedony, possibly dyed or surface-coated

Snowflake Obsidian

Volcanic Glass with Cristobalite Inclusions

Obsidian

Obsidian (Volcanic Glass, SiO2)

Quartz (Milky to Clear)

Silicon Dioxide (SiO2)

Aura Quartz (Titanium/Rainbow Quartz)

SiO2 (Silicon Dioxide) with metallic coating

Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Rose variety)

Silicon Dioxide (SiO2)

Likely quartz or quartz-rich pebble

Quartz (SiO₂), possibly milky quartz or a small quartzite fragment

Weathered feldspar-rich pegmatite (likely orthoclase or plagioclase)

Granitic pegmatite; predominantly K-feldspar/plagioclase (KAlSi₃O₈–NaAlSi₃O₈), with quartz and dark mafic minerals

Snowflake Obsidian

Hydrated Volcanic Glass (primarily SiO2) with Cristobalite inclusions

Muscovite Mica

Muscovite (Potassium Aluminum Silicate Hydroxide Fluoride), KAl2(AlSi3O10)(OH,F)2

Likely tumbled or polished dark purple mineral

Possibly amethyst (purple quartz, SiO₂), though the image is insufficient for confident identification

Obsidian

Volcanic Glass (Amorphous silicon dioxide with impurities)

Quartz / Common Opal Transition

Silicon Dioxide (SiO2)

White quartz-rich pebble, possibly milky quartz

Quartz (silicon dioxide, SiO₂), likely massive milky quartz

Possible industrial slag or basaltic volcanic glass

Likely iron-rich vitreous slag; natural alternative: basaltic glass (tachylite)

Quartz (Druzy)

Silicon Dioxide (SiO2)

Tumbled milky quartz pebbles

Quartz (silicon dioxide, SiO₂)

Snowflake Obsidian

Volcanic Glass (spherulitic obsidian)

Purple Fluorite Octahedron

Fluorite (Calcium Fluoride, CaF2)

Quartz Heart or Arrowhead Shape

Silicon Dioxide (SiO2)

Obsidian

Obsidian (Volcanic Glass)

Obsidian

Obsidian (Volcanic Glass)