mineral
Milky Quartz Pebble with Matrix
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale); Color: White to off-white, opaque; Luster: Vitreous to greasy; Crystal Structure: Trigonal (hexagonal system); Cleavage: Non-existent (conchoidal fracture).
- Hardness
- 7 (Mohs scale)
- Color
- White to off-white, opaque
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 (Mohs scale); Color: White to off-white, opaque; Luster: Vitreous to greasy; Crystal Structure: Trigonal (hexagonal system); Cleavage: Non-existent (conchoidal fracture).
Formation & geological history
Forms through hydrothermal activity within veins in igneous and metamorphic rocks. This specimen shows a smooth, water-worn texture on one side suggesting it was recovered from a riverbed or alluvial deposit.
Uses & applications
Commonly used in landscaping, as an abrasive, in glass manufacturing, and in its pure crystal form for electronics and jewelry.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. The 'milky' appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.
Field identification & locations
Identify in the field by its hardness (it will scratch glass) and lack of cleavage. Look for it in riverbeds, or as veins cutting through granite or metamorphic outcrops.
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