"Kala Namak or Himalayan Black Salt (Urdu کالا نمک; Bengali Biit lobon (বিট লবণ); Newari Be Chi; Nepali Birae Nun (बिरे नुन) ; Hindi काला नमक Marathi काळं मीठ ;kālā namak; Gujarati સંચળ Sanchal; Tamil இந்துப்பு; Malayalam ഇന്തുപ്പ്) also known as sulemani namak, black salt, or kala loon, is a type of rock salt, salty and pungent-smelling condiment used in South Asia. The condiment is composed largely of sodium chloride with several other components lending the salt its colour and smell. The smell is mainly due to its sulphur content. Due to the presence of Greigite (Fe3S4, Iron(II,III) sulfide) in the mineral, it forms brownish pink to dark violet translucent crystals when whole, and, when ground into a powder, it is light purple to pink in color"
Usually people use this when trying to make a dish have an "eggy" flavor
See more @ Wikipedia
More Info..
- Top 5 Benefits Of Black Salt | Best Health and Beauty Tips from Freeze Frame Tips @ Youtube
- The Health Benefits of Black Salt @ BabaMail
- 4 Best Benefits Of Black Salt For Skin, Hair And Health @ Style Craze
- What Are the Health Benefits of Indian Black Salt? By Sirah Dubois
- What Are the Medical Uses of Kala Namak? @ WiseGeek