Many churches in Malta and Gozo have works of art made from this onyx but iż-Żebbuġ church is by far the most spectacular. It is covered with this semi-precious stone. The high altar, the choir, and the baptistery are all sculpted out of this onyx.
Iż-Żebbuġ became an independent parish in 1688 and the building of the present church (without the onyx) started in 1690. The church, dedicated to Santa Marija (St Mary) the Assumption, was consecrated in 1726. The Cathedral apart, it is the oldest parish church to be consecrated in Gozo.
Worthy of special mention is the altarpiece of the Immaculate Conception in a chapel in the left transept, known by the locals as tal-Virtut (of the miracles). Local folklore has it that the radiant face of the Virgin turns yellowish and pale before an impending natural catastrophe. It is also said that one day, when some corsairs dared to devastate the countryside as far as the village, a lady that resembled the image in the altarpiece appeared on the spot hurling stones to repel the enemy.