🪨 Geode facts
| Age | Tertiary volcanic, about 35–40 million years old |
|---|---|
| Origin & sources | Las Choyas ranch area near Ojinaga, Chihuahua, Mexico. |
| Composition | Rhyolite shell with chalcedony and quartz crystals, sometimes amethyst tips or agate banding |
How it forms
Small cavities in rhyolitic volcanic ash filled with silica. They are usually baseball-sized and sold as 'Mexican coconut geodes' to crack open.
Mineral data: see Quartz.
🌍 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.
Learn more
Geode / nodule
Orange
RootCrown
Healing crystal



