Check the listing for details. Que Sera Stone Tower/Obelisk (Brazilian Llanite) sc1180e. Condition: New. Listed at 47.00 USD. Llanite is a porphyritic rhyolite (igneous rock with visible crystals). It has a Black/brown matrix with beautiful Blue Quartz crystals and tan Feldspar. Has many fine natural fractures and small pits.