Heart carved from a septarian geode - Septarian nodule...

Intricately Patterned Septarian Nodule - Calcite Druzy — Spectacular heart-shaped Septarian geode, with a sparkling cavity. — This refined specimen represents an exceptional Septarian, a composite mineral also known as "Dragon Stone", from Madagascar. Septaria forms inside marine clay concretions or mudstone, where contractions during diagenesis create internal fissures that are subsequently filled by secondary minerals, typically calcite, aragonite, and sometimes quartz or dolomite. The external structure of this geode shows the characteristic polygonal and branched veining, derived from the precipitation of dark minerals (often bituminous clays or black chalcedony) that fill the original cracks, contrasting with the beige and gray tones of the host sedimentary matrix. The external appearance of this specimen has been expertly polished and carved into an egg shape, highlighting the fractal patterns and the luster of the surface.

Estimación:€275

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