This is a 13.6 ounces (386 gram) Piranha Brazilian chunk of agate geode/nodule.  It measures ~3.0" x 2.5" x 1.5"< This is very hard material that polishes like GLASS.  Whiteskin oldstock with a skirt?    It has some great potential for some beautiful nice little slabs or cabochons.  It could polish into a nice display piece or slab up to provide many pieces for wind chimes, cabochons or sun catchers.  COMBINE SHIP AND SAVE!