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Abstract stone x-ray style lights stone texture with white background wallpaper. many uses for advertising, book page, paintings, printing, mobile wallpaper, mobile backgrounds, book, covers, screen savers, web page, landscapes, birthday card, greeting cards, function card, letter head etc.A rock is any naturally occurring solid mass or aggregate of minerals or mineraloid matter. It is categorized by the minerals included, its chemical composition and the way in which it is formed. Rocks are usually grouped into three main groups: igneous rocks, metamorphic rocks and sedimentary rocks.