igneous
Que Sera Stone (Llanite / Blue Quartz with Feldspar and Iron Oxides)
Porphyritic Rhyolite (Quartz-Feldspar Porphyry)
Hardness: 6-7 on Mohs scale. Color: Mottled blue-gray, pinkish-brown, cream, and dark black veins. Luster: Glassy to dull when unpolished, vitreous when tumbled. Structure: Microcrystalline matrix with quartz and feldspar phenocrysts. Cleavage: Indistinct to none. Specific Gravity: ~2.6-2.7.
- Hardness
- 6-7 on Mohs scale
- Luster
- Glassy to dull when unpolished, vitreous when tumbled
Identified More igneous →
Explore Que Sera Stone (Llanite / Blue Quartz with Feldspar and Iron Oxides) in the encyclopedia →Identify your own rocks.
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Mottled blue-gray, pinkish-brown, cream, and dark black veins. Luster: Glassy to dull when unpolished, vitreous when tumbled. Structure: Microcrystalline matrix with quartz and feldspar phenocrysts. Cleavage: Indistinct to none. Specific Gravity: ~2.6-2.7.
Formation & geological history
Formed during Precambrian volcanic activity around 1.1 billion years ago. It is an intrusive or extrusive igneous rock where lava cooled rapidly, locking blue quartz phenocrysts within a fine-grained quartz-feldspar matrix.
Uses & applications
Popularly used in crystal healing, jewelry making (cabochons, tumbled stones), and decorative stone carvings.
Geological facts
Que Sera Stone is trade named after the famous song 'Que Sera, Sera' (Whatever Will Be, Will Be). It is composed of a complex mix of minerals including blue quartz, feldspar, magnetite, kaolinite, and iron oxides. Geologically, it is closely related to or identical to Llanite, which is named after Llano County, Texas.
Field identification & locations
Recognizable by its distinctive blue quartz inclusions embedded in a mottled pinkish-brown and dark matrix. Commonly found in Brazil and Llano County, Texas, USA. Collectors value it for its unusual combination of blue quartz and pink orthoclase feldspar.
