igneous
Milky Quartz with Chlorite / Mica inclusions
Silicon Dioxide (SiO2) with phyllosilicate inclusions
Hardness: 7 on the Mohs scale. Color: Opaque white to off-white with greenish-grey and dark inclusions. Luster: Vitreous to greasy. Crystal System: Hexagonal (trigonal). Cleavage: None (conchoidal fracture). Specific Gravity: 2.65.
- Hardness
- 7 on the Mohs scale
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on the Mohs scale. Color: Opaque white to off-white with greenish-grey and dark inclusions. Luster: Vitreous to greasy. Crystal System: Hexagonal (trigonal). Cleavage: None (conchoidal fracture). Specific Gravity: 2.65.
Formation & geological history
Forms in hydrothermal veins, pegmatites, and metamorphic environments through the crystallization of silica-rich fluids. The greenish or dark speckles are secondary minerals like chlorite, muscovite, or biotite mica trapped during quartz growth.
Uses & applications
Commonly collected as rough mineral samples, used in decorative landscaping, or processed for industrial silica extraction in glass and electronics manufacturing.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz gets its cloudy appearance from tiny gas or liquid bubbles trapped within the crystal structure during formation.
Field identification & locations
Can be identified by its hardness (scratches glass readily, cannot be scratched by a steel nail), white cloudy color, and lack of distinct cleavage. Frequently found in riverbeds, mountain gravels, and granite outcrops worldwide.
