1) Antimonide mineral 2) Sulfide mineral
Found on
https://www.crosswordclues.com/clue/allargentum
Allargentum is a mineral from the class of antimonides, superclass of sulfides and sulfosalts (sometimes ascribed to the natural elements and alloys class), with formula written as Ag1-xSbx, where x = 0.09–0.16. This moderately rare mineral is found in silver ores and is therefore named from the Greek άλλος (`allos`, another) and the Lati.....
Found on
http://en.wikipedia.org/wiki/Allargentum
No exact match found.
