📜 Key facts
| Age | Varies by deposit, from about 1.1 billion years (Lake Superior) to a few million years |
|---|---|
| Origin & sources | Worldwide. Classic sources include Brazil, Botswana, Mexico, Scotland and the Lake Superior region. |
| Composition | Chalcedony bands, often around a quartz-crystal centre |
How it forms
Silica layers coat the walls of a cavity one after another, copying its outline with sharp angles. The result looks like the plan of a star-shaped fort.
Mineral data: see Agate.
🌍 Where it's found
- Type locality
- Notable source / deposit
- Country of origin
Marker positions are approximate (region or locality level). Type localities from Wikidata; notable sources curated by Crystopedia.
✨ Metaphysical & Folklore
These are traditional and folk beliefs from crystal lore. They are not scientific or medical claims – crystals are not a substitute for professional care.
Named for bands that look like a castle's walls, fortification agate is a traditional stone of protection, stability and strong boundaries.
💞 Pairs well with (traditional pairings)
AgateA natural partner for stability; Agate also adds composure.
Black TourmalinePaired in tradition for protection, with Black Tourmaline bringing grounding as well.
ObsidianBoth carry the theme of protection, so together they're thought to reinforce it.
ShungiteA natural partner for protection; Shungite also adds purification.
Clear QuartzLifts and clarifies fortification agate's grounding energy; clear quartz is said to amplify any stone.
Learn more
Mineral variety
Orange
Root
Healing crystal