Hi Christopher,
Welcome.
Generally, no, glass stones don't need to be oiled.
With some manufacturers, the black stones do come with a thin layer of chemical (some sort of oil ?) --
any standard kitchen soap or detergent should do the trick of removing any exterior chemicals from the glass stones.
If standard cleaning/washing doesn't help with the chalky dust, I would contact the seller.
The three groups of people:
- those who like their stones clean and dry (void of oil or any other chemicals);
- those who like their stones oiled;
- those who don't care (or notice
).I belong to the first group.
). Wash and wipe each stone. Repeat if necessary.