You focus your powers of observation on a vial labeled 'silvanium':
Item 'a vial labeled 'silvanium'' is type explosive, alignment 0, made of glass (in (100%)condition),
has keywords 'vial labeled silvanium'.
This item weighs 0 stones and 12 pebbles, and is valued at 10,600 gold.
This level 180 item has the attributes: identified throwable explode
Does an average of 312 points of damage when thrown.
*A vial labeled 'silvanium' will last approximately 3,980 more Alyrian minutes.
A vial labeled 'silvanium' looks like it is worth quite a bit of money, and
there is surely a reward for its return!  

Found in the temp catacombs… likely a scatter?

So turns out these are supposedly only found in temp catacombs, not a global scatter.

http://annwn.info/alchemistvials