🦴 Fossil facts
| Age | Ordovician to Permian, most common in Mississippian rocks about 340–320 million years ago |
|---|---|
| Origin & sources | Illinois, Indiana, Kentucky and Alabama (Pentremites), and the Permian of Timor (Indonesia). |
| Composition | Calcite plates (theca), often weathered free of shale |
How it forms
Blastoids were stalked echinoderms related to crinoids, with a bud-shaped head of five-fold calcite plates. They lived on muddy seafloors, and their compact heads often survive whole.
🌍 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
Fossil
Orange
RootCrown
TransformationGroundingCalm
Healing crystal




