🪨 Geode facts
| Age | Commonly Mississippian (about 340 million years) in the US Midwest |
|---|---|
| Origin & sources | USA (Iowa, Missouri, Indiana, Kentucky), Mexico, China. |
| Composition | Calcite crystals (sometimes golden or with pyrite) inside a chalcedony or limestone shell |
How it forms
Carbonate-rich groundwater filled cavities in limestone or nodules, depositing calcite crystals, often after an earlier quartz lining.
Mineral data: see Calcite.
🌍 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.
✨ Calcite family
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Black CalciteMineral variety
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Blue CalciteMineral variety
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CalciteIMA mineral species
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Caribbean Blue CalciteMineral variety

CobaltocalciteMineral variety

Dogtooth CalciteMineral variety
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Green CalciteMineral variety

Honey CalciteMineral variety

Iceland sparMineral variety
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Lemon CalciteMineral variety

Manganoan calciteMineral variety
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Mango CalciteMineral variety
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Merkabite CalciteMineral variety
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Nailhead sparMineral variety
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Orange CalciteMineral variety
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Rainbow CalciteMineral variety
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Red CalciteMineral variety

Satin SparMineral variety
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Stellar Beam CalciteMineral variety
Learn more
Geode / nodule
Yellow
SacralCrown
Healing crystal



