mineral

Star-rutile quartz (rutilated quartz) cabochon

Quartz, SiO₂, containing needle-like rutile, TiO₂ inclusions

AI-generated identification · may be incorrect

Quartz has Mohs hardness 7, vitreous luster, and a hexagonal crystal structure; rutile is typically Mohs 6–6.5. The clear-to-smoky quartz shows dark, radiating needle-like inclusions that create a starburst effect; the stone is cut and polished.

Identified October 11, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallized in silica-rich veins or cavities, with rutile needles trapped during growth. Such inclusions formed over geological time; the image alone cannot establish the specimen’s age or locality.

Uses & applications

Primarily used in cabochon jewelry and as a collector’s gemstone; quartz also has broad industrial uses, though inclusion-rich pieces are usually valued ornamentally.

Geological facts

The starburst is an optical pattern caused by rutile inclusions, not a separate crystal habit. Similar-looking stones may contain other minerals, so identification from a photograph is provisional.

Field identification & locations

Look for fine, needle-shaped inclusions within transparent quartz and a glassy luster; common sources include Brazil and Madagascar. This small cut specimen might sell for about $5–$50 USD, depending on clarity, pattern, and workmanship.