This is Kala Namak, or Himalayan black salt. It is an unrefined, volcanic rock salt (Halite) with a sulfur-like aroma, similar to the smell of hard-boiled eggs. This salt owes its unique taste – a hint of bitterness – to the presence of Sulphur.
We were given a small vial of it (the labeled bottle in the background) by a friend who vacationed in Spain (thus the Spanish spelling of the word Salt… Sal).
Shot for Macro Mondays April 21st theme of Granules.