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White granulated sugar is composed of microscopic, crystalline sucrose molecules.

Like obsidian, in fact, their edges are sharp but the shards have an almost twirly shape and lack the crystalline structure of black-colored minerals like augite or tourmaline.

It all comes down to ferrihydrite, a poorly crystalline mineral, or a substance where the atoms or molecules are not arranged in well-defined and repeating patterns.

In Los Angeles County, they have become the face of an alarming outbreak of silicosis, a deadly lung disease caused by inhaling dust loaded with crystalline silica, among young workers who cut countertops.

Grayson is blind, the result of a rare genetic disorder that stunts the development of the iris and the crystalline lens covering the eye.