They’re often a light brown color. Crystals of calcium carbonate — which is a supplement you can take to get more calcium — are also frequently associated with kidney stones.

When enough calcium carbonate crystals build up, they disrupt the movement of fluid through the semicircular canals, altering the signals that travel to the brain.

"Full carbonate chemistry at the site of calcification in a tropical coral." ScienceDaily. ScienceDaily, 16 January 2019. <www.sciencedaily.com / releases / 2019 / 01 / 190116150627.htm>.