Sedimentary (Microcrystalline Quartz)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide staining)

Agate (Sliced Nodule)

Silicon Dioxide (SiO2) - Chalcedony variety

Limonite and Goethite encrusted Quartz (Iron-stained Gossan)

FeO(OH)·nH2O (Limonite) / FeO(OH) (Goethite) on SiO2 (Quartz)

Quartz on Matrix

Silicon Dioxide (SiO2)

Green Aventurine

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Green Aventurine

Aventurine Quartz (SiO2 with inclusions of Fuchsite)

Mixed collection of Quartz varieties, Chalcedony, and metamorphic pebbles

Mixed gemstones (primarily Silicon Dioxide - SiO2)

Ferruginous Sandstone

Sandstone, Iron-rich

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Hematite/Limonite) inclusions

Quartz (beads)

SiO2 (Silicon Dioxide)

Yellow Quartzite (River Stone)

Quartzite (primarily SiO2)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (primarily SiO2)

Pink Quartzite

Quartzite (SiO2)

Blue Lace Agate

Silicon Dioxide (SiO2)

Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

Copper-bearing Quartz (likely Chrysocolla or Malachite staining)

Cuprite, Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O) or Malachite staining on Quartz/Host Rock

Yellow Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Green Quartzite

Quartzite (SiO2 with chromium-rich muscovite/fuchsite inclusions)

Pink Quartzite

Quartzite (SiO2 with iron oxide impurities)

Quartzite Pebble

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Yellow Quartzite

Quartzite (primarily Silicon Dioxide - SiO2)

Pink Quartzite

Quartzite (mainly SiO2 with iron oxide impurities)

Dream Amethyst (Chevron Amethyst)

Silicon Dioxide (SiO2) with iron impurities and gamma radiation exposure

Quartzite

Quartzite (SiO2)

Quartz (Microcrystalline/Macro crystalline variety)

Silicon Dioxide (SiO2)

Quartzite (River Pebble)

Metamorphic Quartzite (SiO2)

Blue-dyed Quartz Druzy

Silicon Dioxide (SiO2) with artificial pigment

Quartzite

Quartzite (SiO2)

Quartzite with Feldspar

Quartzite (mainly SiO2) with inclusions of Potassium Feldspar (KAlSi3O8)

Quartzite

Metamorphosed Sandstone (SiO2)

Quartzite

Quartzite (SiO2)

Green Aventurine

Silicon Dioxide (Quartz) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)

Clear Quartz

Silicon Dioxide (SiO2)

Red Quartzite (likely Purple/Red variety)

Quartzite (SiO2)

Quartzite

Quartzite (primarily SiO2)

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)

Quartz Vein in Gneiss or Basalt

Milky Quartz (SiO2) within Metamorphic Host Rock

Clear Quartz (Rock Crystal)

Quartz (SiO₂)