Salt Glossary
Rock salt
Salt mined from underground deposits, often sold in coarse crystals.
It is used to de-ice roads and sidewalks and in old-fashioned ice cream makers. The Sifto mine at Goderich, Ontario, about 550 metres (1,800 feet) beneath Lake Huron, is often described as the world's largest underground salt mine.
Related terms
Cite this page
For school projects and reports. Teachers often prefer the original sources too: see the list below.
The Salt Almanac. (2026, November 8). Rock salt. https://saltalmanac.com/glossary/rock-salt
“Rock salt | Salt Glossary.” The Salt Almanac, 8 Nov. 2026, saltalmanac.com/glossary/rock-salt. Accessed [today's date].
“Rock salt | Salt Glossary.” The Salt Almanac. Last modified November 8, 2026. https://saltalmanac.com/glossary/rock-salt.
Original sources
- Canadian Food Inspection Agency. Salt labelling requirements. https://inspection.canada.ca/en/food-labels/labelling/industry/salt
- WorldAtlas. Where is the world's largest underground salt mine? https://www.worldatlas.com/articles/where-is-the-world-s-largest-underground-salt-mine.html
- U.S. Geological Survey. Mineral Commodity Summaries 2026: Salt. https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-salt.pdf