Glass

Rounded pale quartz-rich stone (likely quartzite or milky quartz)

Quartzite, predominantly SiO₂; possibly massive milky quartz

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Pink Quartz / Rose Quartz

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky quartz (rough quartz fragment)

Quartz, silicon dioxide (SiO₂)

Smoky Quartz

Silicon Dioxide (SiO2)

Chert (or Flint)

Microcrystalline Quartz (SiO2)

Chert (Jasper variety)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Quartz Pebble

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with trace Titanium, Manganese, or Iron

Chert (Jasper variation)

Chert (Cryptocrystalline microcrystalline Silicon Dioxide, SiO2)

Chert (Flint)

Chert (SiO2)

Citrine (Heat-treated Amethyst)

Citrine Quartz (SiO2)

Chert / Flint

Silicon Dioxide (SiO₂)

Tumbled carnelian (orange chalcedony)

Carnelian, a microcrystalline variety of quartz (SiO₂), commonly colored by iron oxides

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

White quartz pebble (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Tumbled goldstone-like quartz pebble

Likely iron-stained quartz or jasper; exact identification requires testing

Quartz Crystal (Geode Fragment)

Silicon Dioxide (SiO2)

Tumbled black stone, likely basalt or black jasper

Likely fine-grained basalt (plagioclase–pyroxene); exact identification requires testing

Rounded quartz-rich pebble

Likely quartzite or quartz-rich sandstone; predominantly quartz (SiO₂)

Black-and-white agate geode pendant

Agate (microcrystalline quartz, SiO₂), likely a hollow geode slice with chalcedony and drusy quartz

Clear Quartz Sphere

Crystalline Silicon Dioxide (SiO2)

Carnelian/chalcedony rough

Microcrystalline quartz (SiO₂), iron-oxide-colored chalcedony

Chert or flint fragment

Microcrystalline quartz (SiO₂), commonly called chalcedony or flint

Chert (variant Flint/Jasper)

Microcrystalline Opaline Silica (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (specifically Milky Quartz Pebble)

Silicon Dioxide (SiO2)

Chert / Flint with Cortex

Silicon Dioxide (SiO2)

Quartz on Greenstone

Silicon Dioxide (SiO2) on Altered Igneous Geologic Unit

Clear Quartz

Silicon Dioxide (SiO2)

Sea Glass (Teal/Turquoise)

Amorphous Silica (SiO2) with trace metal oxides

Banded chert pebble

Chert (microcrystalline quartz, SiO₂), likely ribbon-banded chert

Yellow Quartz (Citrine/Iron-Stained Quartz)

Silicon Dioxide (SiO2)

Iron-rich quartz crystal

Quartz, SiO₂, likely iron-stained or hematite-included quartz

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Smoky quartz crystal cluster

Quartz, silicon dioxide (SiO₂), likely smoky quartz with milky quartz matrix

Sandstone (Weathered / Crushed)

Quartz Sandstone

Quartz Pebble

Silicon Dioxide (SiO2)