gemstone
Chalcedony and Malachite
SiO2 (Chalcedony) and Cu2CO3(OH)2 (Malachite)
AI-generated identification · may be incorrectChalcedony is a cryptocrystalline quartz, hardness 6.5-7, waxy luster. Malachite is a copper carbonate, hardness 3.5-4, silky luster, green banding.
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Physical properties
Chalcedony is a cryptocrystalline quartz, hardness 6.5-7, waxy luster. Malachite is a copper carbonate, hardness 3.5-4, silky luster, green banding.
Formation & geological history
Chalcedony forms in cavities in volcanic rocks. Malachite forms in the weathering zone of copper deposits.
Uses & applications
Used in jewelry making, such as the beads shown in this bracelet.
Geological facts
Malachite is often used as a pigment in green paints. Chalcedony is a broad term that includes agate, onyx, and carnelian.
Field identification & locations
Identify chalcedony by its hardness and waxy luster; malachite by its distinctive green banding. Both are widely available worldwide.
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