mineral
Milky Quartz Pebble with Matrix
Quartz (SiO2)
Hardness: 7 on Mohs scale. Color: White to off-white with dark grey matrix or inclusion. Luster: Vitreous to waxy. Fracture: Conchoidal. Crystal system: Trigonal.
- Hardness
- 7 on Mohs scale
- Color
- White to off-white with dark grey matrix or inclusion
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale. Color: White to off-white with dark grey matrix or inclusion. Luster: Vitreous to waxy. Fracture: Conchoidal. Crystal system: Trigonal.
Formation & geological history
Formed in hydrothermal veins, pegmatites, and metamorphic environments where silica-rich fluids cooled and crystallized. Hydrothermal action often deposits white quartz alongside host rock inclusions.
Uses & applications
Commonly used in lapidary work, landscape decoration, silica extraction for glass and electronics, and educational specimen collecting.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust. Its white 'milky' appearance is caused by tiny fluid inclusions trapped during the mineral's growth.
Field identification & locations
Identified by its scratch resistance (scratches glass), glass-like to greasy luster, lack of cleavage, and uneven to conchoidal fracture. Found in gravels, riverbeds, and quartz veins globally.
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