Alum Crystal
From Anne Marie Helmenstine, Ph.D., About.com
This is a large crystal of alum, or aluminium potassium sulfate.
wikipedia.orgGrow Your Own Crystals
©2008 About.com, a part of The New York Times Company.
All rights reserved.
From Anne Marie Helmenstine, Ph.D., About.com
This is a large crystal of alum, or aluminium potassium sulfate.
wikipedia.org©2008 About.com, a part of The New York Times Company.
All rights reserved.