igneous
Que Sera Stone (Llanite)
Rhyolite Porphyry with Blue Quartz and Feldspar
Hardness: 6-7 (Mohs scale), Color: tan to grey-brown base with blue quartz and pinkish feldspar spots, Luster: dull to vitreous when polished, Crystal structure: microcrystalline matrix with phenocrysts.
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan to grey-brown base with blue quartz and pinkish feldspar spots, Luster: dull to vitreous when polished, Crystal structure: microcrystalline matrix with phenocrysts.
Formation & geological history
Formed during the Proterozoic Era (approx. 1.1 billion years ago) as a volcanic igneous rock containing quartz, feldspar, and iron oxides. Most notable source is the Llano Uplift in Texas, USA.
Uses & applications
Primarily used for lapidary work, jewelry, crystal healing practices, and as a decorative specimen for collectors.
Geological facts
Named 'Que Sera' from the song 'Que Sera, Sera' (Whatever Will Be, Will Be). It is scientifically known as Llanite and is famous for its unique inclusions of blue quartz which glow under certain lighting.
Field identification & locations
Identify by the presence of small, distinct blue quartz 'eyes' embedded in a tan/brown rhyolite matrix. It is found in abundance in Llano County, Texas, and is highly sought after by metaphysical collectors.
