One of our fellow shell collectors (Ms. Rusti Stover)
who is also a Psamophile (sand collector)
sent me this to pass on to you all.

Some sands will actually “sing”, or make noise.
 Often referred to as “singing” or “booming” sand, this rare sand produces a
tone when walked on or blown in the wind. Some sands will even create sparks of
light at night when walked on or driven across. The sand’s sound waves are
caused by the friction between the grains of this sand’s unique crystalline
structure. Singing sands are becoming harder and harder to find as modern
pollution tends to coat the sand particles and destroy its ability to produce
sound. At the time of writing this, singing sand can still be found on every
continent of the world.
 …Internet source re sand info, from about 4 years ago.

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