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The complete history of the Universe -- from the Big Bang to 200 my into the future

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History of the Universe eBook. 398 pages, 300 illustrations only $2.99

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Quartz

Quartz is a mineral consisting mostly of silica SiO. Quartz is normally transparent, but small quantities of other atoms added to the silica can color it violet (amethyst), yellow (citrine), black (morion) or other colors.

Quartz is the main constituent of light colored sand.

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History of the Universe eBook. 398 pages, 300 illustrations only $2.99

eBook only $2.99
398 pages, 300 images

"I find the science fabulous...an extremely useful teaching tool."
Professor David Christian

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