mineral
Tumbled honey-brown chalcedony, possibly carnelian
Microcrystalline quartz (SiO₂); chalcedony, with carnelian referring to orange-red varieties
AI-generated identification · may be incorrectTranslucent to opaque brown-orange, waxy to vitreous luster, Mohs hardness about 6.5–7, and no visible cleavage. The small, smooth specimen appears tumbled; color alone cannot confirm the exact variety.
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Physical properties
Translucent to opaque brown-orange, waxy to vitreous luster, Mohs hardness about 6.5–7, and no visible cleavage. The small, smooth specimen appears tumbled; color alone cannot confirm the exact variety.
Formation & geological history
Silica-rich fluids deposited microscopic quartz in rock cavities, later colored by iron oxides. Chalcedony forms in many ages and geological settings.
Uses & applications
Used for beads, cabochons, carvings, and inexpensive jewelry or mineral collections.
Geological facts
Chalcedony is quartz whose crystals are too small to distinguish unaided; iron impurities commonly produce warm orange and brown tones.
Field identification & locations
Look for translucency at thin edges, a waxy luster, and hardness sufficient to scratch glass; common sources include Brazil, India, Uruguay, and the United States. A photo cannot distinguish it conclusively from other brown chalcedony or similar stones.
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