The Mineral Encyclopedia Gadget astronomer Tyler Nordgren illustrates how

astronomer Tyler Nordgren illustrates how this most seemingly unnatural of natural phenomena was transformed from a fearsome omen to a tourist attraction

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The Mineral Encyclopedia Gadget astronomer Tyler Nordgren illustrates howMineral collecting by amateur "rockhounds" has never been more popular. Old quarries, road cuts, and exposed landscapes are being examined by new generations of minerals enthusiasts. Each needs a comprehensive guidebook with clear photographs and accurate data. This is it. In a thick but handy format, more than 700 different minerals and rocks are grouped by color (for ease of location in the book) blue, red, yellow, brown, green, white and black