Quartz

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz

SiO2 (Silicon Dioxide)

Clear Quartz

Silicon dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Chert (with Desert Varnish/Iron Stain)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Pyrite in Quartz

Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)

Jasper

Silicon dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Diorite (Salt and Pepper Rock)

Diorite

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartzite River Pebble

Quartzite (SiO2)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Chalcedony (Common Opal variant or Chert/Flint)

Silicon Dioxide (SiO2)

Argetine Blue Agate (Chalcendony variant)

Silicon Dioxide (SiO₂)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Citrine or Iron-Stained)

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide staining)

Jasper

Silicon Dioxide (SiO2) with impurities (mostly Iron Oxides)

Smoky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Crystal (specifically Rock Crystal)

Silicon Dioxide (SiO2)

Amethyst Geode Cathedral

Amethyst (Silicon Dioxide - SiO2 with Iron impurities)

Clear/White Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartzite with Hematite staining

Quartzite (SiO2) with iron oxide inclusions (Fe2O3)

Rough Citrine Quartz

Citrine (Silicon Dioxide, SiO2 with iron impurities)

Chalcedony (Common Opal variant or Quartz)

Silicon Dioxide (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

River Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Sandstone with Iron Concretion

Arenite with Limonite/Goethite Concretion

Sandstone with Algae Growth

Arenite with Chlorophyta/Lichen

Sandstone Concretion with Fossil Wood

Ferruginous Sandstone Concretion (SiO2 with Fe2O3 cement)

Dyed Alum or Dyed Quartz (Ornamental Crystal)

Silicon Dioxide (SiO2) or Potassium Alum [KAl(SO4)2·12H2O]

Chert / Yellow Jasper

Silicon Dioxide (SiO2)

Ocean Jasper (Orbicular Jasper)

Orbicular Rhyolite (SiO2)

Handaxe with Inlaid Fossil Echinoid

Flint / Chert (SiO2) containing a fossil Conulus albogalerus

Leopard Skin Jasper

Silicon Dioxide (SiO2) with various inclusions

Kambaba Jasper

Stromatolite (Fossilized Algae)