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 classification: Schist

Wall Number Country State Source Description
S2-18 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-19 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-20 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-21 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-22 United States Maryland Potomac some with cleavage vertical, Varicolored chlorite, some with cleavage horizontal
S2-23 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-24 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-25 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-26 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-27 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-28 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-29 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-30 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-31 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-32 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-33 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-34 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-35 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-36 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-37 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
11RB30 United States Virginia Farquier Co. dark gray, fine grain, compact, biotite, schist
S2-38 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
19EE United States Maryland Potomac vari-colored chlorite schist, Stonyhurst
S2-39 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
20EE United States Maryland Potomac vari-colored chlorite schist, Stonyhurst
S2-40 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
23WE United States Maryland Potomac varicolored chlorite schist, Stonyhurst
S2-41 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
8RA27 United States Maine Knightsville dark gray, fine grain, compact, talcose
S2-42 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-11 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-43 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-44 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-12 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-45 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-13 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-46 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-14 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S3-9 United States Virginia Lynchburg green, coarse-grain actinolite schist, Virginia Greenstone
S2-15 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-16 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical
S2-17 United States Maryland Potomac Varicolored chlorite, some with cleavage horizontal, some with cleavage vertical