mineral

Milky Quartz (Tumbled)

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale. Color: Cloudy white to opaque creamy-white. Luster: Vitreous (glassy) to greasy when polished. Crystal Structure: Hexagonal (trigonal). Cleavage: None (conchoidal fracture). Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Cloudy white to opaque creamy-white
Luster: Vitreous (glassy) to greasy when polished

Identified March 23, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal solutions or the cooling of magma in igneous veins. The milky appearance is caused by microscopic inclusions of fluids (gas or liquid) trapped during crystal growth. These specimens can be from any geological age, often appearing in Precambrian to Cenozoic formations.

Uses & applications

Used widely in lapidary work for jewelry (beads, cabochons), home decor, and 'healing' stone collections. Industrially, quartz is used in glassmaking, electronics (as oscillators), and as an abrasive.

Geological facts

Milky Quartz is the most common variety of crystalline quartz. While often overlooked for clearer varieties like Amethyst, high-quality Milky Quartz can exhibit 'girasol' effects, showing a hazy internal glow. It is the primary constituent of most white sand beaches.

Field identification & locations

Identify in the field by its hardness (will scratch glass and steel), lack of cleavage, and white streak. It is found globally, notably in the USA (Arkansas), Brazil, and Madagascar. Collectors should look for smoothness and the presence of minor iron staining (reddish-brown streaks) which adds character.

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