Ice Cream
Published on Nov 29, 2015
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Ice cream
Created by:
colton missildine
Photo by jenny downing
Rock salt (halitite) (8.3 cm across) - blue & whitish & clear & orangish rock salt (8.3 cm across) from the subsurface Salado Formation of New Mexico. The orangish and bluish coloration is caused by radiation from potassium-40 in nearby potash salts, resulting in excess free sodium metal in the halite.
Table salt is largely rock salt that has been crushed and purified. There is little real chemical difference as both are largely sodium chloride.
Table salt will occasionally have trace quantities of other things added such as iodine to prevent people getting goitres.
Photo by djwtwo
