The material cools so rapidly that atoms during the melt are unable to set up by themselves into a crystalline composition. So, pumice is surely an amorphous volcanic glass generally known as a "mineraloid." ① NATURAL VOLCANIC LAVA: This Pumice Stone is made out of normal volcanic lava, which makes https://mysocialguides.com/story4845647/5-simple-statements-about-pumice-stone-explained