NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.

Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.

U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Engineering Laboratory

Materials and Structural Systems Division

Back to Stone Search

Stone description: Porphyritic

Wall Number Country State Classification Source
10RB49 United States Wisconsin Quartz Marquette
11RB40 United States Wisconsin Quartz Brandon
1L6 Canada Granite Halifax Co.
5LA27 Austria Quartz South Tyrol
5RB28 Austria Quartz South Tyrol
6rb32 United States Colorado Granite Georgetown
7LB23 United States North Carolina Quartz Charlotte
7LB36 United States Nevada Andesite Virginia City
7LB41 United States Montana Granite Lewis & Clark Co.
7RA24 United States Maine Granite Crotch Isl.
8RB27 United States Maine Granite Dedham
Was this page helpful?