mineral

Pink quartz geode

Quartz geode; silicon dioxide (SiO₂), commonly chalcedony with drusy quartz

AI-generated identification · may be incorrect

White to pale pink, sugary drusy crystals lining a hollow cavity; vitreous to pearly luster, trigonal quartz structure, conchoidal fracture, no cleavage, Mohs hardness 7, and specific gravity about 2.65. Pink coloration may reflect iron, inclusions, or surface treatment.

Identified August 26, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater deposits chalcedony and quartz crystals inside gas vesicles or cavities in volcanic rock, usually basalt. The cavity may develop over months to millions of years; the specimen’s precise age cannot be determined from the image.

Uses & applications

Used as a decorative and lapidary specimen, crystal display, and occasional jewelry material; geodes are popular educational and collector objects.

Geological facts

The hollow interior is called a vug, and the tiny crystals are termed drusy or druzy quartz. Brown-orange patches may be iron-oxide staining or inclusions.

Field identification & locations

Identify by the hollow rounded cavity, sparkly quartz lining, hardness, and lack of cleavage; common sources include Brazil, Uruguay, Mexico, and the western United States. Avoid assuming the pink color is natural without testing or provenance.