mineral

Banded Agate (Pink/Peach Chalcedony)

Agate (Silicon Dioxide, SiO2)

Hardness: 6.5–7 on Mohs scale; Color: Pink, white, and peach bands; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.64

Hardness: 6
Color: Pink, white, and peach bands
Luster: Waxy to vitreous

Identified May 16, 2026More mineral →

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Physical properties

Formation & geological history

Formed in cavities of volcanic rocks (lavas) or metamorphic rocks when silica-rich groundwater deposits layers of chalcedony over long periods of time. The banding represents rhythmic crystallization pulses.

Uses & applications

Used primarily in lapidary arts for jewelry, decorative carvings, beads, and metaphysical specimens. Historically used for making mortar and pestles due to its hardness.

Geological facts

Agate is named after the Achates River in Sicily where it was first discovered. The pink color is often caused by trace amounts of iron or manganese impurities within the quartz structure.

Field identification & locations

Identify in the field by looking for translucent edges, distinct concentric or eccentric banding, and a waxy surface texture when tumbled or weathered. Found worldwide in volcanic regions like Brazil, Botswana, and Lake Superior.

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