mineral

Banded Agate (Dyed / Polished)

Microcrystalline Quartz (SiO2)

AI-generated identification · may be incorrect

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

Identified July 25, 2026More mineral →

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Physical properties

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.