mineral
Chrysoprase-like green chalcedony (tentative)
Microcrystalline quartz, SiO₂, likely nickel-colored chalcedony; associated brown iron oxides
AI-generated identification · may be incorrectMohs hardness 6.5–7; pale mint-green, earthy to waxy luster, opaque to translucent, with conchoidal fracture and no obvious cleavage. The rough surface and matrix suggest a natural silica nodule or vein fragment.
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Physical properties
Mohs hardness 6.5–7; pale mint-green, earthy to waxy luster, opaque to translucent, with conchoidal fracture and no obvious cleavage. The rough surface and matrix suggest a natural silica nodule or vein fragment.
Formation & geological history
Forms when silica-rich groundwater precipitates chalcedony in cavities and fractures, with nickel compounds producing green color and iron oxides staining the matrix. Exact age and locality cannot be determined from the image.
Uses & applications
Used as a lapidary stone, cabochon, carving material, and collector specimen; quality chrysoprase can be used in jewelry, while matrix-rich pieces have modest decorative value.
Geological facts
Chrysoprase is the greenest commercially important chalcedony variety; its color may fade with prolonged heat or sunlight. Similar-looking material can include dyed agate, variscite, turquoise, or green copper minerals.
Field identification & locations
Commonly found in Australia, Brazil, Poland, Tanzania, and the western United States. Confirm with a hardness test, streak, specific gravity, and ideally nickel/copper testing; visual identification alone is uncertain.
