Size of stones vary between 1 inch or 1/2 inch pieces
 
What is Zebra Rock?
Quartz and basalt, the name "zebra rock" is given to at least 3 different mineral combinations. The one shown here: a schist from Australia, and a variety of marble known as black zebra/zebra stone from Pakistan. 
 
Healing with Zebra Rock
Brings compassion. Good for teeth and gums. Helps dry skin, osteoporosis, bone cancer, muscle spasms and vitamin deficiencies. Combats shallowness.