Many stone clocks—especially those made in France during the mid-to-late Nineteenth-Century—are commonly called, “Marble Clocks.” Usually black, white or gray, but also in a variety of other colors, these clock cases are not made of marble, but rather are made of slate. With an attractive shine, slate offers a weight to these clocks which makes them the ideal base for a pendulum clock. Slate also makes a perfect background for gilt and ormolu ornamentation. Remember, if you own a slate clock; always make sure to lift it by the base. Due to its weight, slate is prone to chipping and cracking. Lifting by anything other than the base can cause damage to the clock’s case.