mineral

Banded Agate (Jasper-Agate)

Silicon Dioxide (SiO2) - Chalcedony Variety

Hardness: 6.5-7 on Mohs scale; Luster: Waxy to vitreous; Color: Red, brown, white, tan, and grey banding; Crystal System: Trigonal (microcrystalline); Conchoidal fracture; Specific gravity: ~2.58-2.64.

Hardness: 6
Color: Red, brown, white, tan, and grey banding
Luster: Waxy to vitreous

Identified July 24, 2026More mineral →

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Physical properties

Formation & geological history

Forms primarily within cavities (vugs) of volcanic host rocks through precipitation of silica-rich solutions over extended geological periods.

Uses & applications

Widely used for lapidary work, cabochon cutting, polished display specimens, decorative carvings, and gemstone jewelry.

Geological facts

Agate bands are composed of alternating layers of fibrous chalcedony and granular quartz, with distinct colors caused by iron oxides (hematite/goethite) and trace elements.

Field identification & locations

Identified by translucent to opaque concentric or fortifications-like banding, waxy fracture surface, and high hardness that resists scratching by a steel knife. Commonly found in Brazil, Madagascar, Mexico, and the USA (e.g., Lake Superior region).

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