Knotted
a.) Characterized by small, detached points, chiefly composed of mica, less decomposable than the mass of the rock, and forming knots in relief on the weathered surface; as, knotted rocks.
a.) Characterized by small, detached points, chiefly composed of mica, less decomposable than the mass of the rock, and forming knots in relief on the weathered surface; as, knotted rocks.