There exists huge amount of minerals called Tourmaline and Ilmenite
in the granites of Gunung Raya (i.e. Mount Raya).
These minerals are run down by the spring water from the mountain and
cause the color of sand to turn black.
But this phenomena seems to be an exception in Langkawi.
It has been observed by the scientists that these minerals
rarely cause sand to turn black elsewhere in the world.
[https://www.langkawi-insight.com/langkawi_000014.htm]
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