mineral

Quartz / Quartz Geode Fragment

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Grayish-white to clear; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: Indistinct/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Grayish-white to clear
Luster: Vitreous to greasy

Identified June 14, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Grayish-white to clear; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: Indistinct/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Formed through the cooling of silica-rich hydrothermal fluids or within sedimentary cavities (geodes). Often associated with ancient volcanic activity or metamorphic processes where mineral-rich water deposits crystals over time.

Uses & applications

Used widely in manufacturing glass, electronics (piezoelectric properties), abrasives, and as a popular ornamental stone for collectors and lapidary work.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is highly resistant to chemical and physical weathering, which is why it is the primary component of most beach sands.

Field identification & locations

Identify in the field by its hardness (it will easily scratch glass) and its lack of cleavage. Look for characteristic conchoidal (shell-like) fractures on broken faces. Commonly found in mountainous regions, riverbeds, and desert outcrops.

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Mineral/Rock

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Metamorphic Rock

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