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出典:『Wikipedia』 (2011/04/14 17:28 UTC 版)

英語による解説

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Llanite is a hypabyssally intruded rhyolite with phenocrysts of microcline and euhedral quartz. The quartz crystals are blue hexagonal bipyramids. The unusual blue coloration of the quartz is thought to be due to ilmenite inclusions . It is named after Llano County, Texas, the only place where it is found (according to locals, however geologists have identified other locations this rock my be found according to Dr. Robert Reed , a geology professor at The University of Texas at Austin). A dike of llanite outcrops on Texas State Highway 16 about 9 miles north of the town of Llano.