igneous
Que Sera Stone (Llanite)
Rhyolite porphyry with blue quartz inclusions
Hardness: 6-7 (Mohs scale); Color: Mixture of pink (feldspar), grey/black (biotite/magnetite), and distinctive blue (quartz); Luster: Vitreous to dull; Crystal structure: Porphyritic (fine-grained matrix with larger crystals)
- Hardness
- 6-7 (Mohs scale)
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mixture of pink (feldspar), grey/black (biotite/magnetite), and distinctive blue (quartz); Luster: Vitreous to dull; Crystal structure: Porphyritic (fine-grained matrix with larger crystals)
Formation & geological history
Formed during the Proterozoic Era (approx. 1.1 billion years ago) from the rapid cooling of silica-rich lava containing unique blue quartz crystals. Only found in a few locations globally, primarily Brazil and the Llano Uplift in Texas.
Uses & applications
Primarily used as a decorative stone, for lapidary work including cabochons and tumbled stones, and highly valued in the metaphysical community for jewelry and meditation.
Geological facts
The 'Que Sera' trade name comes from the song 'Que Sera, Sera' (Whatever Will Be, Will Be). It is unique for its blue quartz phenocrysts which gain their color from ilmenite or rutile inclusions.
Field identification & locations
Identified by the unique combination of pinkish-tan feldspar background speckled with bright or dusky blue quartz 'eyes'. It is often found in riverbeds or outcrops within the Llano Uplift region of Texas.
