Septaria ball 4.7Kg on brass base
PUMI2655-1
Initially, this spetraria from Madagascar was not a perfect ball, but a large rounded pebble. Once polished it was installed on a brass base so that you can admire its internal crystallization.
The Septarias are prehistoric marine nodules, of biochemical origin followed by dehydration during diagenesis, which is now found in large pebbles in clay soil. The creation of a Septaria is a succession of accidents, having crossed the eras: they are formed around a core of organic matter (vegetable or animal) come to run aground on the silt of a seabed. This element is then colonized by anaerobic bacteria, which will create an imbalance during their metabolism: we observe a putrefaction of the organic body and a precipitation of carbonates, resulting in a sphere full of water, containing various dissolved minerals.
The sediments continue to settle on the nodule, compacting it under their weight, which will flatten it and expel water, while inside, microcracks begin to be created, amplified by tectonic movements. It is in these shrinkage slots that over time, the dissolved minerals will crystallize. Its name comes from the Latin «septum» which means partition, barrier, indeed, the polishing of the nodule allows to reveal and sublimate its elegant marbling of black calcite.
The Septarias are prehistoric marine nodules, of biochemical origin followed by dehydration during diagenesis, which is now found in large pebbles in clay soil. The creation of a Septaria is a succession of accidents, having crossed the eras: they are formed around a core of organic matter (vegetable or animal) come to run aground on the silt of a seabed. This element is then colonized by anaerobic bacteria, which will create an imbalance during their metabolism: we observe a putrefaction of the organic body and a precipitation of carbonates, resulting in a sphere full of water, containing various dissolved minerals.
The sediments continue to settle on the nodule, compacting it under their weight, which will flatten it and expel water, while inside, microcracks begin to be created, amplified by tectonic movements. It is in these shrinkage slots that over time, the dissolved minerals will crystallize. Its name comes from the Latin «septum» which means partition, barrier, indeed, the polishing of the nodule allows to reveal and sublimate its elegant marbling of black calcite.
