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cream and caramel zones
17kg block that maintains excellent structural integrity is rare
making it a meaningful piece for collectors
Color: Golden yellow
Sardonyx Egg - 2in. - Intuitively selected Iron Phosphate cream and caramel zonesGeological Overview Sardonyx is a specialized variant of onyx, which itself is a banded variety of chalcedony (a cryptocrystalline form of silica, SiO2). Geologically, Sardonyx is defined by its alternating layers of sarda brownish red chalcedony coloured by iron oxideand parallel bands of white or black onyx. Forming within the trigonal crystal system, it typically precipitates from silica rich waters in the cavities of volcanic or sedimentary rocks.