mineral
Yellow Chalcedony
SiO2 (Silicon Dioxide)
Hardness of 6.5 to 7 on the Mohs scale, yellow to amber color, waxy to vitreous luster, cryptocrystalline structure, conchoidal fracture with no distinct cleavage, and specific gravity of 2.60 to 2.65.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, yellow to amber color, waxy to vitreous luster, cryptocrystalline structure, conchoidal fracture with no distinct cleavage, and specific gravity of 2.60 to 2.65.
Formation & geological history
Formed in low-temperature hydrothermal environments, often lining cavities, vesicles, and fractures in volcanic or sedimentary rocks through the deposition of silica-rich solutions.
Uses & applications
Commonly used in lapidary arts, making cabochons, beads, carved ornamental objects, and jewelry making.
Geological facts
Chalcedony has been used since antiquity for intaglios and seals because it takes a fine polish and is tough enough to resist everyday wear.
Field identification & locations
Can be identified by its distinctive botryoidal or mammillary habit, waxy luster, and conchoidal fracture. Found worldwide with notable deposits in Brazil, India, Madagascar, and the USA.
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