mineral
Milky Quartz with Matrix
Quartz (Silicon Dioxide, SiO2)
Hardness: 7 Mohs; Color: Opaque white with black/dark matrix; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65
- Hardness
- 7 Mohs
- Color
- Opaque white with black/dark matrix
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 Mohs; Color: Opaque white with black/dark matrix; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65
Formation & geological history
Formed through hydrothermal processes where silica-rich fluids cool in veins or cavities within crustal rocks. It is found in igneous, metamorphic, and sedimentary environments worldwide.
Uses & applications
Used for lapidary work, as a decorative specimen, in gemstone 'mining' bags for children, and industrially for glassmaking and electronics (when pure).
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. The 'milky' appearance is caused by tiny fluid inclusions of gas or liquid trapped during crystal growth.
Field identification & locations
Identify by its characteristic hardness (will scratch glass) and lack of cleavage. Commonly found in riverbeds, mountains, and mine tailings. This specific specimen appears to be a small chip from a larger vein.
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