This is known as the learning Crystal. It represents tranquility, peace, and unconditional love. Also, it helps the body's resistance to illness.
 
Large: Height is 1 inch. Length is 1.5 inches and width is 2.5 inches. Weight is 3.45 oz. 
Small: Height is 1/2 inch. Length 1.5 inches and width is 1.5 inches. Weight is 2.60 oz.