mineral
Milky Quartz with inclusions
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 (Mohs scale); Color: Opaque white to pale pinkish-white with gray/green inclusions; Luster: Vitreous to greasy; Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
- Hardness
- 7 (Mohs scale)
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 (Mohs scale); Color: Opaque white to pale pinkish-white with gray/green inclusions; Luster: Vitreous to greasy; Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
Formation & geological history
Forms in hydrothermal veins or as a primary constituent of granitic pegmatites. The milky appearance is caused by tiny inclusions of liquid or gas trapped during the crystal's growth.
Uses & applications
Used in the electronics industry for its piezoelectric properties, as an abrasive, in glass manufacturing, and as a popular specimen for rock collectors.
Geological facts
Quartz is the second most abundant mineral in the Earth's continental crust. Milky quartz is often associated with gold and other precious metal deposits in hydrothermal vein systems.
Field identification & locations
Identify by its hardness (will scratch glass), lack of cleavage, and common occurrence in igneous and metamorphic terrains. Found globally, especially in mountain ranges and riverbeds.
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Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Septarian Pebble
Septarian nodule / Concretion
sedimentary