This is one of the ampules seen in the Engineer's ceremonial chamber in Prometheus. It still had dirt and grime from the set. It is the mid-sized ampule (there are ampules larger and smaller) and is the size David 8 brought back to Prometheus.
There were dozens if not hundreds of these castings made, and you can see a number of them in the behind the scenes footage of the film.Propstore of London has these piece available for sale: http://www.propstore.com/product-Pyramid-Chamber-Mid-Size-Ampule.htm
