Black sand. Does anyone have pics ?

[Psyire]

I wouldn't say detritus, but instead bits and pieces of the rocks themselves that fall off and collect on the sand.

Of course it all dosen't matter when you have 1000+ baby cerith snails living in it. These little shells are everywhere... especially at night. (they cover the sand in a sea of white) They are starting to get bigger and head up on the rocks now, so it's been interesting to watch.