mineral
Milky Quartz
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Opaque white to translucent
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
Formation & geological history
Formed in hydrothermal veins and pegmatites. The white color is caused by tiny inclusions of gas or liquid trapped during crystal growth. Can be found in igneous, metamorphic, and sedimentary environments.
Uses & applications
Used in glassmaking, ceramics, electronics (source of silicon), ornamental stone, and as a popular specimen for beginner rock collectors.
Geological facts
Milky Quartz is the most common variety of crystalline quartz. It is often found in large veins that can extend for miles through darker host rocks like granite or schist.
Field identification & locations
Identify by its white color, ability to scratch glass (hardness 7), and lack of cleavage. It is found globally in riverbeds, mountains, and beaches.
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Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
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Epidote
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metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
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Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Calcite–fluorite mineral specimen with iron-oxide staining
Calcite (CaCO₃), likely fluorite (CaF₂), with possible quartz and iron/manganese oxides
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