mineral
Banded Agate (Dyed / Polished)
Microcrystalline Quartz (SiO2)
Hardness: 6.5-7 Mohs. Color: Natural translucent grey-blue with dark blue artificial dye spots. Luster: Waxy to vitreous. Crystal system: Trigonal (microcrystalline/cryptocrystalline). Cleavage: None, exhibits conchoidal fracture.
- Hardness
- 6
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 Mohs. Color: Natural translucent grey-blue with dark blue artificial dye spots. Luster: Waxy to vitreous. Crystal system: Trigonal (microcrystalline/cryptocrystalline). Cleavage: None, exhibits conchoidal fracture.
Formation & geological history
Formed in cavities of volcanic igneous rocks or sedimentary formations where silica-rich groundwater deposited successive layers of chalcedony and quartz over thousands of years.
Uses & applications
Commonly used in lapidary art, jewelry, cabochons, decorative carvings, paperweights, and metaphysical practices.
Geological facts
This specimen is a polished slice of natural agate featuring horizontal water-level (Uruguay-type) banding. Small dark blue spots indicate it has undergone dye testing or artificial enhancement, a common process for commercial agate specimens.
Field identification & locations
Identified by fine parallel banding, translucent translucent body, and high hardness. Commonly found in Brazil, Uruguay, Madagascar, and the Lake Superior region of North America.
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