mineral
Rutilated quartz beads
Quartz (SiO₂) with rutile (TiO₂) inclusions
AI-generated identification · may be incorrectQuartz has Mohs hardness 7, vitreous luster, and a trigonal crystal structure; the beads are transparent to translucent with dark needle-like inclusions. Bead cutting and reflections make precise identification of the inclusions uncertain.
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Physical properties
Quartz has Mohs hardness 7, vitreous luster, and a trigonal crystal structure; the beads are transparent to translucent with dark needle-like inclusions. Bead cutting and reflections make precise identification of the inclusions uncertain.
Formation & geological history
Quartz crystallized from silica-rich fluids or pegmatitic environments, with rutile needles trapped during growth; the specimens’ geological age and source cannot be determined from the image.
Uses & applications
Cut and polished as jewelry beads and collected as decorative quartz.
Geological facts
Rutile inclusions can form striking needle-like patterns, sometimes called “Venus hair” quartz.
Field identification & locations
Look for internal acicular inclusions rather than surface scratches; similar dark inclusions can be other minerals. Rutilated quartz occurs in places including Brazil, Madagascar, and India.
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