The green stone is Connemara marble, an ophicalcite, a metamorphic rock composed of calcite and serpentine minerals, the latter of which give it a green color. There is also a rectangle of Verona marble embedded in the floor in front. The pulpit is white marble, with pillars of green onyx mottled with white and gold. Steps to the communion railing are Verde Antique. The communion railing is a white true marble and has several supporting pillars of onyx marble, varying in color from white to gold to light green.
Sanctuary flooring is a marble mosaic.
The marble is of several types, including red Verona marble, Siena marble, a white marble, and a green marble. The side altars are white marble with insets of golden and yellow-colored marble and onyx. The statues of St. Helen and St. Ann to the sides of the altar are made of white marble carved by a statuary company in Pietrasanta, Italy. This was of special significance for the Irish parishioners.