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rock salt

How It’s Made: Road Salt
Image: Science Channel

How It’s Made: Road Salt

We sprinkle rock salt (or halite) to de-ice roads and sidewalks, but it's also used to create homemade ice cream. The mineral form of sodium chloride (NaCl), it's typically colorless or white — but depending on the impurities, halite can be blue or even pink.

Explore how rock salt forms, why wars have been fought over this mineral, and how it differs from table salt.

Science Channel
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Chemistry of Ice-Cream Making

Chemistry of Ice-Cream Making

Make ice cream for science with this delicious project. You'll see firsthand how rock salt and other substances affect the freezing point of water. More...

Activity
Science Buddies
Signs of Life Found Inside Rock Salt

Signs of Life Found Inside Rock Salt

Researchers have found traces of life inside halite crystals. Explore how this discovery is helping scientists understand evolution — and even the possibility of life on other planets. More...

Article
Space.com
Ice and Salt

Ice and Salt

Does road salt actually "melt" ice? Depends on how you define the term. See how several scientists tackle that question and explain the process. More...

Article
Newton/Department of Energy
Oldest Salt Mine

Oldest Salt Mine

Archaeologists recently proved that people have been exploiting salt deposits since the 5th millennium BC. Discover the economic and symbolic importance of rock salt in ancient times. More...

Article
Science Daily
Photo Gallery: Salt Flats

Photo Gallery: Salt Flats

Utah's Bonneville Salt Flats are an excellent example of a dried-up seabed where salt has formed — in some places, the crust is 5-feet deep. Take a look. More...

Images
Bureau of Land Management
Salt Mining

Salt Mining

The U.S. produces approximately 46 million tons of salt each year. See how it's mined: deep-shaft mining, solution mining, and solar evaporation. More...

Article
HowStuffWorks
Searles Lake Pink Halite

Searles Lake Pink Halite

The brine pools of this dry lake in California have rock salt that's colored pink and green because of bacteria and algae. More...

Images
NASA
What Is Rock Salt?

What Is Rock Salt?

How is "rock salt" different from "table salt"? Take a closer look at halite, a natural sedimentary rock formed from seas that evaporated millions of years ago. More...

Article
wiseGEEK

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