Answer:
Rock 
Explanation:
Minerals are inorganic substances that occur naturally in nature and have a  
a definite chemical composition and a crystalline structure while rocks may consists of one or many minerals together along with some organic remains due to which it may not look shiny and crystalline from outside.  
Here, the two characteristics that enable the reader to identify the object given by grandmother to Emily as rock  are –  
a)	Looks ugly on the outside (shows the presence of organic matter)
b)	solid purple color with pretty crystals (crystalline structure inside)
 
        
             
        
        
        
It allows the recipient to cure certain things like sickle cell disease. 
can help those w/ leukemia ! 
All recipients have impairment for a while after the transplant
        
             
        
        
        
No se we pero te dejo un momazo aquí