Industrial mineral site no. 1220, known as "Mount Adams" is a site in Yakima County, Washington. This site has been associated with perlite. A notation found in DGER Bulletin 37 on page 82 says "Black perlite", and designates the value as "Unknown".
Summary
Industrial mineral site no. 1220, known as "Mount Adams" is a site in Yakima County, Washington. This site has been associated with perlite. A notation found in DGER Bulletin 37 on page 82 says "Black perlite", and designates the value as "Unknown".