mineral
Tumbled yellow chalcedony (possibly citrine or pale agate)
Chalcedony, microcrystalline quartz (SiO₂); exact variety cannot be confirmed visually
AI-generated identification · may be incorrectTranslucent pale honey-yellow, vitreous to waxy luster, smooth tumbled surface; quartz hardness about 7 Mohs, trigonal crystal structure at microscopic scale, no prominent cleavage. Specific gravity is typically about 2.6.
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Physical properties
Translucent pale honey-yellow, vitreous to waxy luster, smooth tumbled surface; quartz hardness about 7 Mohs, trigonal crystal structure at microscopic scale, no prominent cleavage. Specific gravity is typically about 2.6.
Formation & geological history
Silica-rich fluids deposited quartz in rock cavities or fractures; the piece was subsequently cut and tumbled. Chalcedony deposits formed across many geological ages.
Uses & applications
Used for beads, cabochons, and small decorative objects; quartz is also an important industrial material.
Geological facts
Chalcedony is made of extremely fine quartz crystals, so individual crystals are generally not visible without magnification.
Field identification & locations
A smooth, glassy surface and hardness near 7 help distinguish quartz varieties; common sources include Brazil, Uruguay, India, and Madagascar. Color alone cannot establish whether this is agate or citrine.
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