Mineral (Synthetic Glass)

Slag Glass (Cullet Glass)

Amorphous Silica (Industrial byproduct)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Milky Quartz (Water-Worn Pebble)

Silicon Dioxide (SiO2)

White Quartz Pebble

Silicon Dioxide (SiO2)

Smoky quartz

Quartz, silicon dioxide (SiO₂), smoky variety

Lepidolite

K(Li,Al)3(Al,Si,3O10)(F,OH)2

Calcite

Calcium Carbonate (CaCO3)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Milky Quartz with Matrix

Quartz (Silicon Dioxide, SiO2)

Smoky Quartz with Feldspar

Quartz (SiO2) with Potassium Feldspar (KAlSi3O8)

Quartz (specifically Milky or Rose Quartz)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Yellow/Tan Quartzite Pebble)

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Quartz (Quartzite fragment)

Silicon Dioxide (SiO2)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Quartz geode or drusy quartz cluster

Quartz (silicon dioxide, SiO₂), likely microcrystalline quartz lining a cavity

Quartz (Milky or Iron-stained)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Milky quartz (quartz-rich fragment)

Quartz, silicon dioxide (SiO₂)

Chert (Flint)

Silicon Dioxide (SiO2)

Chert Nodules

Microcrystalline Quartz (SiO2)

Slag Glass

Amorphous Silica Glass (with metal oxide inclusions)

Tumbled pink quartz (probable rose quartz)

Quartz, silicon dioxide (SiO₂), commonly colored by trace elements and microscopic inclusions

Tumbled yellow quartz (likely citrine or iron-stained quartz)

Quartz, silicon dioxide (SiO₂); yellow coloration likely from iron impurities

White quartz pebble

Quartz (SiO₂), likely milky quartz

Iron-Stained Quartz (Red/Hematoid Quartz)

Silicon Dioxide (SiO2) with Hematite/Goethite inclusions

Smoky Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Rough Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

Quartz in Matrix (possibly Basalt or Siltstone host)

Silicon Dioxide (SiO2) in Host Rock

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Weathered quartz-rich cobble, possibly milky quartz with iron staining

Quartz (SiO₂), likely with iron-oxide/hydroxide coatings and minor host-rock inclusions

Tumbled smoky quartz with iron-stained inclusions

Quartz (SiO₂), likely smoky quartz variety

Quartz (specifically Milky or Clear Quartz)

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Clear Quartz Sphere

Silicon Dioxide (SiO2)