igneous

Coarse-grained Quartz with Feldspar inclusions

Crystalline Quartz (SiO2) with Orthoclase/Plagioclase Feldspar inclusions

Hardness: 7 (Quartz) to 6 (Feldspar) on Mohs scale. Color: Translucent white to smoky gray (quartz) with salmon-pink to beige (feldspar). Luster: Vitreous to greasy. Crystal Structure: Hexagonal (Quartz) / Monoclinic or Triclinic (Feldspar). Cleavage: None (conchoidal fracture) in quartz; two directions in feldspar.

Hardness: 7 (Quartz) to 6 (Feldspar) on Mohs scale
Luster: Vitreous to greasy

Identified March 4, 2026More igneous →

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Physical properties

Formation & geological history

Formed through the slow cooling of silica-rich magma or within hydrothermal veins. This specific coarse-grained texture is typical of pegmatites or granitic rocks formed deep within the Earth's crust over millions of years.

Uses & applications

Used primarily as decorative stone, in construction aggregates, and occasionally as a source of high-purity silica for glassmaking. Small specimens are popular among amateur rock collectors for geological study.

Geological facts

Quartz is the second most abundant mineral in Earth\'s continental crust. When found with these distinct orange-pink inclusions, it often indicates the presence of potassium-rich feldspar, which provides the coloring through iron impurities within the feldspar lattice.

Field identification & locations

Identify in the field by its hardness (will scratch glass), translucent appearance, and the presence of opaque, differently colored mineral blocks within the mass. Found globally in granitic shields and mountain ranges like the Appalachians or Rockies.

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Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.

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