igneous
Que Sera Stone (Llanite with Feldspar and Quartz)
Rhyolite with blue quartz and pink orthoclase (Llanite-type quartz porphyry)
Hardness: 6-7 on Mohs scale; Color: Bluish-grey matrix with pink feldspar pockets and dark inclusions; Luster: Vitreous to dull; Crystal Structure: Microcrystalline with coarse phenocrysts; Cleavage: Poor/None in massive form; Specific Gravity: 2.6-2.7
- Hardness
- 6-7 on Mohs scale
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Bluish-grey matrix with pink feldspar pockets and dark inclusions; Luster: Vitreous to dull; Crystal Structure: Microcrystalline with coarse phenocrysts; Cleavage: Poor/None in massive form; Specific Gravity: 2.6-2.7
Formation & geological history
Formed from volcanic igneous activity as a porphyritic rhyolite, where magma cooled quickly at the surface with pre-existing larger crystals like blue quartz and orthoclase feldspar.
Uses & applications
Popular as a tumbled gemstone for lapidary arts, jewelry components, pocket stones, and metaphysical crystal collecting.
Geological facts
'Que Sera Stone' is a commercial trade name for a specific composite rock containing blue quartz, pink feldspar, iron oxides, and other minerals, often associated with similar rocks like Llanite from Llano County, Texas, or specimens from Brazil.
Field identification & locations
Identified by the distinct combination of opalescent or grayish-blue quartz spots set alongside pinkish orthoclase feldspar in a fine-grained rhyolitic matrix. Tumbled pieces show smooth, polished surfaces highlighting these varied mineral zones.
