mineral
Milky Quartz with Mineral Inclusions
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale. Color: Translucent to milky white with dark inclusions (possibly hematite or goethite). Luster: Vitreous to greasy. Crystal structure: Hexagonal/trigonal. Cleavage: Indistinct/conchoidal fracture.
- Hardness
- 7 on Mohs scale
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale. Color: Translucent to milky white with dark inclusions (possibly hematite or goethite). Luster: Vitreous to greasy. Crystal structure: Hexagonal/trigonal. Cleavage: Indistinct/conchoidal fracture.
Formation & geological history
Forms in igneous, metamorphic, and sedimentary environments through the cooling of silica-rich magma or precipitation from hydrothermal fluids. This specimen appears to be a small fragment from a quartz vein.
Uses & applications
Raw quartz is used in glassmaking, abrasives, and as a source of silicon for electronics. Translucent pieces with interesting inclusions are popular for mineral collecting or lapidary work.
Geological facts
Quartz is one of the most abundant minerals in Earth's continental crust. Identifying inclusions (like the dark spots seen here) can often reveal the temperature and pressure conditions at which the crystal grew.
Field identification & locations
Identify in the field by its hardness (will scratch glass), conchoidal fracture, and lack of true cleavage. Found globally in a wide variety of geological terrains.
