Check the listing for details. Que Sera Stone Tower/Obelisk (Brazilian Llanite) sc1180a. Condition: New. Listed at 36.00 USD. Llanite is a porphyritic rhyolite (igneous rock with visible crystals). It has a Black matrix with beautiful Blue Quartz crystals and tan Feldspar. Has many fine natural fractures and small pits. This has been polished, but has more of a matte finish.