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5cmThickness 4cmA chalcedony is a form of cryptocrystalline quartz
This unique mineral was formed around 50 to 70 million years ago during Earth’s Cretaceous Period
colored by manganese or cesium and forms in masses and prismatic crystals
Wolframite & Quartz From Pasto Bueno
Polished Septarian nodule Freeform From Madagascar geode 5cmThickness 4cmA chalcedony is aPolished Septarian nodule Freeform From Madagascar Weight 0. 400kg Size 8cm by 8cm Thickness 4cm Septarian is the name given to a concretion stone composed of a sedimentary rock and Calcite, and is usually found as ovoid or spherical nodules. Concretion is derived from two latin words con meaning together and crescere meaning to grow, and this can be used to describe the formation and characteristic markings of this unusual stone. This unique mineral
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