Australian Opal (Doublet) with Gemologist Certification
Code: C08007
 
📏Size: 1,2 - 0.9 - 0.4  cm
Weight: 3,9 ct 
 
🌟Here are five key factors that contribute to the formation of opals:
 
🌟Sedimentary rock: Opals are mainly found in sedimentary rocks, which are formed from the accumulation of sediment over time. These rocks provide the framework for opal formation, as they contain cracks and voids where the silica-rich solutions can penetrate.
 
🌟Silica spheres: The silica-rich solutions that seep into the cracks and voids of sedimentary rocks contain microscopic spheres of silica. These spheres are arranged in a regular pattern and diffract light, giving opals their amazing colors.
 
🌟Silica-rich waters: The silica-rich solutions needed for opal formation are derived from silica-rich waters. These waters contain dissolved silica that is carried through underground channels and eventually deposited in sedimentary rocks.
 
🌟Ironstone patterns: In some cases, the silica-rich solutions may also contain iron oxide, which can result in unique ironstone patterns within the opal. These patterns add to the beauty and value of the opal.
 
🌟Active opal mining fields: Opals are mainly found in specific regions known as opal mining fields. These fields are usually located in arid or semi-arid areas where the conditions for opal formation are favorable. Some of the most famous opal mining fields in Australia include Lightning Ridge, Coober Pedy, and Andamooka.