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 pore spaces (known as vesicles) in pumice are a clue to how it forms. The vesicles are actually gas bubbles that were trapped in the rock during the rapid cooling of a gas-rich frothy magma. The material cools so quickly that atoms in the melt are not able to arrange themselves into a crystalline structure. Thus, pumice is an amorphous volcanic glass known as a  mineraloid .