mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 Mohs; Color: White to opaque; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65
- Hardness
- 7 Mohs
- Color
- White to opaque
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 Mohs; Color: White to opaque; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65
Formation & geological history
Formed in hydrothermal veins or pegmatites where silica-rich fluids cool and crystallize. The white color is caused by tiny gas or liquid inclusions trapped during crystal growth.
Uses & applications
Used as an abrasive, in glass manufacturing, as a gemstone in jewelry (cabochons), and as a source of silicon for electronics. Rough pieces are often used in landscaping.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of crystalline quartz.
Field identification & locations
Identified by its white color, inability to be scratched by steel, and lack of cleavage. Found globally in almost all geological environments, especially in gravel beds and mountain trails.
More like this
Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Schist
Schist
Metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Nephrite Jade
Nephrite
Mineral/Rock