[SE2000]

It is a reddish brown. Since its very old volcano activity, the rocks have broken down. When I got there I said it was sand and some locals told me it was the remains of the lava flows. I believed them as it is different from all the beach sands there. And there are a lot of differences on different beaches.
I've seen video of the black lava flows on the big island, that stuff is geologically brand new