1 Monday: The Garden Grove forecast for Oct 19 is 79 degrees and Partly Cloudy. 2  There is 48 percentage chance of rain and 6 mph winds from the Southwest. 3  Tuesday: The Garden Grove forecast for Oct 20 is 84 degrees and Sunny.
Pumice (pronunciation: /ËpÊmáµ»s/), called pumicite in its powdered or dust form, is a volcanic rock that consists of highly vesicular rough textured volcanic glass, which may or may not contain crystals. It is typically light colored.
The pumice stone is extremely rough and very porous and surprisingly light when picked up. This is the only stone that will actually float on water until becoming waterlogged, at which point it will sink. The mineral makeup of pumice depends on the type of magma that composes the pumice foam. Basalt Minerals Basalt is a gray to black fine-grained volcanic rock that is often the origin of pumice.