Echinoid
Fossil
Also called Sea urchin, Fossil sea urchin, Shepherd's crown, and Fairy loaf
About it
Sea urchin shells (tests) marked with five rows of paired pores radiating from the top, usually without their spines. Flint casts are common in the chalk of England and France; Morocco and Texas supply many more.
- Type
- Fossil (echinoderm)
- Group
- Echinoid (echinoderm)
- Colours
- grey, white, cream, brown, black
- Transparency
- opaque
- Periods
- Jurassic, Cretaceous, Paleogene, Neogene
Typical values: real specimens vary. For more, see mindat.org.