That’s salt — we couldn’t live without it. Salt is a mineral. It’s really difficult to mention “minerals” without your listener’s eyes glazing up and
Although I love geoscience, I’m not a geologist, though I tried to become one. Mineralogy lab was tough – you had to identify rocks without
Note: A version of this article appeared on Helium, June 15, 2011. Limestone is a calcium-based rock that has many uses in daily life.