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
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Physical properties
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.
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.
