mineral
Blue chalcedony (beaded bracelet)
Chalcedony, microcrystalline quartz (SiO₂)
AI-generated identification · may be incorrectTypically Mohs 6.5–7; pale to medium blue, translucent to opaque, with a waxy-to-vitreous luster. It is microcrystalline and lacks visible cleavage; the beads are polished and likely dyed or color-enhanced.
- Color
- enhanced
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Physical properties
Typically Mohs 6.5–7; pale to medium blue, translucent to opaque, with a waxy-to-vitreous luster. It is microcrystalline and lacks visible cleavage; the beads are polished and likely dyed or color-enhanced.
Formation & geological history
Forms as silica deposits in cavities and veins, often from low-temperature hydrothermal fluids. Chalcedony occurs in rocks of many ages; the bracelet’s source and geological age cannot be determined from the photo.
Uses & applications
Used for beads, cabochons, carvings, and ornamental objects; quartz-rich chalcedony has limited industrial use compared with bulk quartz.
Geological facts
Chalcedony is a cryptocrystalline variety of quartz, commonly banded in agate; uniform bright bead colors may result from treatment.
Field identification & locations
Common sources include Brazil, Uruguay, India, Madagascar, and the United States. Identify by hardness, waxy luster, and lack of cleavage; the image alone cannot confirm natural color or exact variety.
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