1 Sunday: The Garden Grove forecast for Oct 25 is 83 degrees and Sunny. 2  There is 13 percentage chance of rain and 5 mph winds from the West-Northwest. 3  Monday: The Garden Grove forecast for Oct 26 is 85 degrees and Sunny. 4  There is 22 percentage chance of rain and 2 mph winds from the East.
Pumice /ËpÊmÉ¨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.Scoria is another vesicular volcanic rock that differs from pumice in having larger vesicles, thicker vesicle walls and being dark colored and denser. Pumice is created when super-heated, highly pressurized rock is violently ejected from a volcano.The unusual foamy configuration of pumice happens because of simultaneous rapid cooling and rapid depressurization.t is commonly, but not exclusively of silicic or felsic to intermediate in composition (e.g., rhyolitic, dacitic, andesite, pantellerite, phonolite, trachyte), but basaltic and other compositions are known. Pumice is commonly pale in color, ranging from white, cream, blue or grey, to green-brown or black.
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 .