These are high-energy Selenites from New Mexico, and their smooth, flat surfaces make them ideal for body layouts, especially when you want to amplify the energies of other stones. I like to use these plates to make large Energy Templates, gluing on from three to as many as a dozen stones. The Selenites can harmonize and amplify the energies of the entire group!
 
Pictured are examples, (stones sold individually) shapes and color may vary somewhat
 
Small 4.5-5.5"
Medium 6.5-7.5"
Large 8"+
 
Selenite Healing Properties and other items