mineral

Milky Quartz with Matrix

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: Opaque white to light gray; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Hardness: 7 (Mohs scale)
Color: Opaque white to light gray
Luster: Vitreous to greasy

Identified July 11, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: Opaque white to light gray; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Formation & geological history

Forms in hydrothermal veins or as a constituent of igneous rocks like granite. This specimen appears to be a small quartz fragment attached to a darker host rock (matrix). Highly consistent with the metamorphic and igneous geology of Taiwan's Central Mountain Range and its river runoff.

Uses & applications

Used in glassmaking, electronics (piezoelectric properties), abrasives, and as decorative stone or landscaping material.

Geological facts

Milky quartz gets its white color from tiny bubbles of gas or liquid trapped during crystal growth. It is one of the most common minerals on Earth's crust.

Field identification & locations

Identify by its hardness (it will scratch glass) and lack of cleavage. Common in riverbeds and mountainous terrain in southern Taiwan. Look for its characteristic waxy or glassy luster.