https://www.soest.hawaii.edu/GG/ASK/rocksalt.html

You might know this substance as table salt. and... Actually, rock salt is not K2SO4; it is NaCl. It can have impurities of gypsum (CaSO4) and sylvite (KCl) but it is ...

http://jes.ecsdl.org/content/106/1/54.abstract

Abstract. Because of the known interference of certain impurities and the suspected effect of others in the electrolytic cell processes for the production of sodium ...

https://www.thoughtco.com/simple-method-to-purify-sodium-chloride-from-rock-salt-606076

May 23, 2019 ... Learn how to apply two simple purification techniques to get table salt by removing impurities from rock salt.

http://files.dep.state.pa.us/water/Wastewater%20Management/WastewaterPortalFiles/Rock%20Salt%20Paper%20final%20052711.pdf

The high content of sodium in the rock salt can result in interference issues for ... The chemical composition of rock salt, compared to SGEW, yielded very low ...

https://medium.com/@cwmin223/rock-salt-and-industrial-salt-3e15e25bacdc

Feb 23, 2017 ... Rock salts appear to be discolored caused by mineral impurities, or caused by the bending of light through the salt lattice. Mostly rock salts are ...

https://en.wikipedia.org/wiki/Halite

Halite commonly known as rock salt, is a type of salt, the mineral (natural) form of sodium chloride (NaCl). Halite forms isometric crystals. The mineral is typically colorless or white, but may also be light blue, dark blue, purple, pink, red, orange, yellow or gray depending on inclusion of other materials, impurities, ...

http://www.erocksalt.com/where-rock-salt-come-from/

Jan 27, 2012 ... Like gasoline and natural gas, rock salt is an important resource. ... While some discoloration of salt is caused by mineral impurities, other ...

http://onlinepubs.trb.org/Onlinepubs/trr/1987/1110/1110-003.pdf

as much as 3.5 times; hence, the calcium sulfate impurities contained in rock salt brine become highly detrimental, caus- ing attack on cement mortar samples.

http://www.erocksalt.com/rock-salt-uses/

Dec 11, 2018 ... In its primitive appearance, rock salt looked like huge irregular crystals with different ... Rock salt's tonality is related to the impurities it has.

https://www.rocksalt.co.uk/inspiration/what-is-rock-salt

It forms as isometric crystals and is typically colourless or white, but may also be other colours depending on the amount and type of impurities contained within it  ...