Glow Stones absorb either natural or artificial light and then emit that light as a soft glow during darkness. Exposure of around 30 minutes will give a glow time of approximately 6 – 8 hours. The glow starts off brightly and diminishes as the night progresses. The photoluminescent compound, strontium aluminate which makes the stones glow has a cycle life of at least 10 years.

The importance of minerals in everyday life is hardly recognized by the vast majority of people. According to the U.S. Bureau of Mines, the average person consumes or uses 40,000 pounds of minerals every year. Over the course of a lifetime, an individual will use more than 1,050 pounds of lead, 1,050 pounds of zinc, 1,750 pounds of copper, 4,550 pounds of aluminum, 91,000 pounds of iron and steel, 360,500 pounds of coal, and one million pounds of industrial minerals such as limestone, clay, and gravel.

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