Mineral (Man Made Glass, Not Natural)

Quartz Pebble

Silicon Dioxide (SiO2)

Slag Glass

Amorphous Silica Glass (with metal oxide inclusions)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Basalt

Basalt

Polished/tumbled jasper, likely ocean jasper or brecciated jasper

Jasper: microcrystalline quartz (SiO₂) with iron oxides and other silicate impurities

Dyed blue quartz or druzy geode (likely)

Quartz, silicon dioxide (SiO₂), probably artificially colored

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (primarily SiO2)

Quartz (Smoky Quartz)

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Iron-Stained Quartz

Silicon Dioxide with Iron Oxide (SiO2 with Fe2O3)

Polished mahogany obsidian (likely)

Volcanic glass; primarily silica-rich rhyolitic glass (SiO₂), with iron oxides

Chert / Flint

Silicon Dioxide (SiO2)

Smoky Quartz (Polished)

Silicon Dioxide (SiO2)

Quartzite

Metamorphic Quartz Rock (SiO2)

Diamond (or synthetic simulant)

Cubic C (Carbon)

Chert

Chert (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Polished black agate slice

Chalcedony (microcrystalline quartz), SiO₂, with iron/manganese staining

Tumbled black-and-white banded stone, likely onyx or agate

Cryptocrystalline quartz (SiO₂), probably banded chalcedony/onyx

Polished white agate or chalcedony bead

Microcrystalline quartz (SiO₂), likely chalcedony/agate with iron-oxide staining or a brown mineral inclusion

Sandstone

Arenite (SiO2 based)

Smoky Quartz

Silicon Dioxide (SiO2)

Quartzite

Metamorphic Quartzite (SiO2)

Quartz Pebble with Mineral Inclusions

Silicon Dioxide (SiO2)

Quartz (Citrine / Golden Quartz)

Silicon Dioxide (SiO2)

Citrine

Silicon Dioxide (SiO2)

Cardstock (Paper)

Cellulose (C6H10O5)n

Granite (Light-colored quartz/feldspar variety)

Granite (composed primarily of Quartz SiO2 and Feldspar KAlSi3O8)

Citrine Quartz

Quartz (SiO2) - specifically, a variety of macrocrystalline quartz

Granite (Leucogranite)

Felsic Plutonic Rock (Granite)

Adventurine (Green)

Silicon Dioxide (SiO2) with inclusions of Fuchsite

Chert (Cherty Shale / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Smoky Quartz Geode Slice

Silicon Dioxide (SiO2)

Sandstone

Arenite (clastic sedimentary rock)

Fire Agate (Crackle Agate)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Clear Quartz (Faceted) or Cubic Zirconia / Glass imitation

SiO2 (if Quartz), ZrO2 (if Cubic Zirconia)

Sandstone

Arenite (SiO2 principal component)

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Obsidian (likely blue-sheen or coated obsidian)

Volcanic glass; primarily rhyolitic silica glass (SiO₂-rich, noncrystalline)

Smoky Quartz

Silicon Dioxide (SiO2)

Sandstone

Arenite (composed primarily of SiO2)