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Minerals: Graphite on marble
Dimensions: (50.92×44.71×19.39) mm for matrix
Origin: Grenville, Québec
Information: This graphite comes from a vein of graphite only in a marble and sandstone formation. The matrix is made of a graphite layer on marble. A portion of the structure has a crack, but is supported by the inner mixture graphite/marble of the matrix. The graphite / marble proportion of the matrix is approximately 90% for 10%.