Why black sand beaches have black sand?

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Black sand is most common on the coasts of volcanic islands (Hawai’i, the Canary Islands, the Aleutians, etc.). Black sand beaches are black because they are composed of volcanic minerals and lava fragments, which are dark-coloured. http://www.sandatlas.org/colors-in-sand/

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Source: stackoverflow.com

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Why black sand beaches have black sand?

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