Other
Minerals Education Coalition: Perlite
Basic information about the volcanic glass perlite. Find out where perlite got its name, where it comes from, and the many uses of perlite.
Texas A&M University
Texas Greenhouse Management: Handbook: Growing Media
An extensive list of growing media from the Texas A&M Dept. of Horticulture.
US Geological Survey
Usgs: Perlite Statistics and Information
The USGS presents Perlite statistics and information. Includes annual publications, contacts, and resources.
Australian Museum
Australian Museum: Igneous Rock Types
Learn about the different types of igneous rocks and how they are classified.