Llanite Rhyolite

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Llanite (also known as Llano Rhyolite, Texan Que Sera and Vulcanite) is a type of rhyolitic igneous rock with hexagonal bi-pyramids. It has Quartz inclusions, Microcline and Plagioclase Feldspars, Biotite, Iron Oxides, Magnetite and other trace minerals that form a conglomerate all within a deep brown matrix. The blue coloration of the quartz is due to ilmenite inclusions.  Llanite is somewhat rare.

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Llanite is named after Llano County, Texas, the only place where it is found.