Septarian Gemstone Crystal Egg 1 us size 5 Face of nugget approx 18

Face of nugget approx 18 x 33 mm

Great design from Julio ~ lovely detail on the feathered wings

Face  21 x 33 mm

Whilst not a tremendously rare stone

Iolite is pleochroic

Septarian Gemstone Crystal Egg 1 us size 5 Face of nugget approx 18Septarian Gemstone Egg Septarian is a concretion of rock, formed from a calcium rich clay that hardened into a limestone nodule. Later, the rock shrank, creating cracks that were then filled with water in which calcite crystal formed. The angular cracks are called septaria which comes from the Greek word septum meaning partition. That Calcium rich clay was originally the bed of an Ocean so the source of the Calcium was Marine Life. The Brown crystals