gemstone
Agate
Chalcedony (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, banded color patterns ranging from brown and red to white, and a cryptocrystalline structure.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, banded color patterns ranging from brown and red to white, and a cryptocrystalline structure.
Formation & geological history
Formed by the deposition of silica from groundwater in the cavities of igneous and sedimentary rocks over millions of years.
Uses & applications
Widely used in jewelry, ornamental carvings, and gemstone collecting.
Geological facts
Agate is one of the most popular materials for tumbled stones and cabochons due to its durability and striking natural banding.
Field identification & locations
Easily identified by its distinct concentric bands and conchoidal fracture. Commonly found worldwide, including Indonesia where similar ring stones are culturally popular.
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Amber
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Diamond and Gold Jewelry
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Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
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Pearl necklace
Pearl, primarily aragonite (CaCO₃) and conchiolin
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