mineral

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 (Mohs scale); Color: Opaque white to translucent; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 (Mohs scale)
Color: Opaque white to translucent
Luster: Vitreous to waxy

Identified July 9, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: Opaque white to translucent; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed through hydrothermal processes where silica-rich fluids cool in crustal fractures. Milky appearance is caused by tiny gas or liquid inclusions trapped during crystal growth. This specimen was rounded by beach or river erosion.

Uses & applications

Used in glassmaking, abrasives, electronics (piezoelectric properties), landscaping, and frequently collected as tumbled stones or beach treasures.

Geological facts

Milky quartz is the most common variety of crystalline quartz. Historically, it was used by ancient civilizations for stone tools due to its hardness and sharp fracture edges.

Field identification & locations

Identified in the field by its hardness (it will scratch glass), white color, and rounded shape when found on beaches. Found globally in almost all geological environments.