LuLu, I don't know if they all have black sand in Dominica, but I can tell you how black sand beaches were formed.

Caribbean Black Sand Beaches
Formed when hot lava flows into the Caribbean Sea, and breaks into black sand pieces which eventually flows back to the shore. The texture of black sand is course, unlike white sand or pink sand beaches. Volcanic black sand beaches of the Caribbean's volcanic islands include: St. Lucia, Grenada, Dominica, Nevis, St. Kitts and Montserrat.

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