Antropogenic (Man Made Glass Byproduct)

Quartzite

Metamorphic Quartzite (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz with Mica inclusions

Silicon Dioxide (SiO2) with Muscovite/Biotite inclusions

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Pegmatite (Feldspar and Quartz)

Pegmatite (KAlSi3O8 / SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Shale

Shale (claystone/mudstone)

Quartz (Granular)

Silicon Dioxide (SiO2)

Polished black stone, likely black obsidian

Obsidian (volcanic glass), primarily silica-rich rhyolitic composition

Olivine (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Peridotite (Olivine/Peridot)

Peridotite: (Mg,Fe)2SiO4 (Olivine-rich ultramafic rock)

Clear Quartz and Rose Quartz Bracelet

Silicon Dioxide (SiO2)

Peridot (Olivine)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Rounded river cobble, likely weathered sandstone or quartz-rich metasandstone

Indeterminate sandstone; commonly quartz (SiO₂) with feldspar, lithic grains, and iron-oxide cement

Snowflake Obsidian (Tumbled)

Obsidian with Cristobalite inclusions

Rose Quartz

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2)

Peridot (Gem-quality Olivine)

Magnesium Iron Silicate ((Mg, Fe)2SiO4)

Peridot

Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)

Orbicular jasper (ocean jasper)

Microcrystalline quartz (SiO₂), chiefly chalcedony with feldspar, zeolites, and iron-oxide inclusions

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz crystals on a Matrix base (Geode fragment)

Silicon Dioxide (SiO2)

Chert (Chalcedony)

Cryptocrystalline Quartz (SiO2)

Quartz (Water-worn pebble)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal) Bead

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite Pebble

Quartzite (SiO2)

Pink Feldspar (Orthoclase)

Orthoclase Feldspar (KAlSi3O8)

Faceted Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Quartz (Smoky/Milky Variety)

Silicon Dioxide (SiO2)