What is Quetzalcoatlite?
Quetzalcoatlite is a rare blue to blue-green tellurium-bearing oxide valued as a scarce micromount and for its unusual copper, zinc, lead, silver and chlorine chemistry.
Mineralogy and crystal structure
Reference formula: Zn6Cu3(TeO6)2(OH)6·(Ag,Pb,□)Cl. The idealised formula is commonly written with variable silver, lead and vacancy content. The exact trigonal COD model contains the hydrated tellurium-oxide framework and should be treated as a rare lead- and silver-bearing specimen; do not grind or create dust. Quetzalcoatlite is classified with oxides and has a trigonal crystal system. Typical hardness is 3–3.5 on the Mohs scale and specific gravity is approximately 6.0–6.1.
Colour, lustre and habit
Typical colours include deep blue, blue-green, pale blue. The usual acicular, crusty, radiating habit and pearly, dull lustre help describe a specimen, but colour alone is not diagnostic.
Formation and notable localities
Quetzalcoatlite forms in or is associated with oxidised tellurium-bearing hydrothermal deposits, commonly as crusts or radiating aggregates on quartz. Important documented localities include the Bambollita Mine near Moctezuma, Sonora, Mexico, and other rare oxidised tellurium localities.
A blue tellurium oxide for the serious collector
Quetzalcoatlite sells through rarity and colour rather than size. A tiny blue crust can document an unusual oxidised ore environment and carry more mineralogical interest than a much larger common specimen.
Collecting and care
Keep enclosed, dry and away from acids. Wash hands after handling and do not cut, grind or use lead-bearing material in jewellery or food-contact objects.
