| Gewicht | 0,504 kg (504 gr) |
|---|---|
| Dimensions | 7 × 7 × 7 cm |
| Sales Unit | |
| Type | |
| Form | |
| Origin | |
| SKU | 21475 |
Septarie Sphere
Sales unit: Unique
Septarie Sphere from Madagascar
Septarie
Septarie, also called septarian nodule, is a concrete rock composed of a combination of minerals, mostly calcite, aragonite and clay, with cracks filled with crystals. The name refers to the natural cracks ("septaria") created during drying and later filled.
Septarie usually forms in sedimentary environments by shrinkage and crystallisation in muddy deposits. Major deposits include Madagascar, the United States and England. The chemical composition varies by component, but calcite (CaCO₃) is often dominant. Hardness ranges between 3 and 4 on the Mohs scale.
There are no established sub-variants, but septarie from Madagascar is often considered a recognisable and popular form because of its distinct markings and yellowish calcite fill.
Sources:
Mindat.org, Wikipedia - Septarian concretion
