Skip to main content
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.

Stone classification: Gabbro

Wall Number Sort descending Country State Source Description
5LB34 United States Minnesota Duluth dark gray, coarse grain, gabbro
S2-82 United States Wisconsin Ashland black, medium-grain, olivine, Norite