mineral

Milky Quartz Geode or Druzy Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous (glassy) to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: White to translucent
Luster: Vitreous (glassy) to greasy

Identified May 15, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous (glassy) to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed through the precipitation of silica-rich hydrothermal fluids in cavities or veins of host rocks. The white color is caused by microscopic fluid inclusions trapped during crystal growth.

Uses & applications

Used in the production of glass, ceramics, and electronics (due to piezoelectric properties). Smaller specimens are popular for rock collecting and metaphysical uses.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz specifically gets its appearance from gas or liquid bubbles that were trapped as the crystal formed millions of years ago.

Field identification & locations

Identify in the field by its hardness (cannot be scratched by steel), glassy luster on fresh surfaces, and lack of cleavage. Often found in riverbeds or eroded out of sedimentary limestone formations.

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Mineral

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Mineral/Rock

Banded Gneiss (River Rock/Pebble)

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Metamorphic Rock