igneous
Que Sera Stone (Llanite)
Rhyolite containing blue quartz and feldspar
Hardness: 6-7 (Mohs scale), Color: tan to gray groundmass with dark spots and blue quartz phenocrysts, Luster: dull to vitreous, Crystal structure: microcrystalline groundmass with larger inclusions, Specific gravity: approx 2.6
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan to gray groundmass with dark spots and blue quartz phenocrysts, Luster: dull to vitreous, Crystal structure: microcrystalline groundmass with larger inclusions, Specific gravity: approx 2.6
Formation & geological history
A porphyritic rhyolite formed from rapid cooling of volcanic magma. The most famous deposit is in the Llano Uplift of Texas, USA, dating back to the Proterozoic eon (about 1.1 billion years old).
Uses & applications
Primarily used for lapidary work, decorative carvings, points/towers for crystal healing collections, and unique jewelry pieces.
Geological facts
This specific rock is often marketed as 'Que Sera Stone' or 'Galaxite' in the metaphysical community, though geologically it is a variety of Llanite. It is unique because of the distinct blue color of its quartz inclusions.
Field identification & locations
Identified by the distinct dark 'clumped' inclusions and flashes of blue quartz within a pinkish-tan or gray rhyolite base; found predominantly in Llano County, Texas.
