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EGG107 Septarian

EGG107 Septarian

$30.00

Egg107: Septarian – Locality: Madagascar. Selection: Polished.

Appearance: Yellow Calcite crystal contrasted with Brown Aragonite.

Approximate measurements: Diameter x Length – 2 1/4″ x 2 1/8″.

Availability: single specimen, exclusive.

In stock

Description

Septarian, also known as a type of Concretion, is a volume of sedimentary rock in which a mineral cement fills the porosity.  Concretions are often ovoid or spherical in shape.  They form within layers of sedimentary strata that has already been deposited.  It is composed of a Carbonate mineral such as Calcite, a Silica such as Chert, Flint or Jasper or an Iron Oxide such as Goethite or Hematite.  It is commonly found in Shale, Siltstones and Sandstones.

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