mineral

Milky Quartz with Mineral Inclusions

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to creamy tan with grey/dark inclusions; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Opaque white to creamy tan with grey/dark inclusions
Luster: Vitreous to greasy

Identified March 24, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the crystallization of magma or from hydrothermal veins. The milky appearance is caused by tiny fluid inclusions of gas or liquid trapped during crystal growth. These specimens can range in age from millions to billions of years.

Uses & applications

Used in the glass industry, as an abrasive, in electronics (due to piezoelectric properties), and widely in gemstone carving and landscaping gravel.

Geological facts

Milky quartz is the most common variety of crystalline quartz. Historically, it was used by many cultures for stone tools and ritual objects due to its durability and abundance.

Field identification & locations

Identify in the field by its inability to be scratched by a steel knife (hardness test) and its waxy or greasy luster. It is commonly found in riverbeds, glacial till, and mountainous outcrops worldwide.

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