Mayor Island

 

Mayor Island, also known as Tuhua, is a dormant peralkaline volcanic island located in the Bay of Plenty, New Zealand. The island formed approximately 7,000 years ago and is composed primarily of rhyolitic lava domes and flows. Its most notable geological feature is the presence of obsidian, a volcanic glass prized by Māori for tool-making. The island’s volcanic nature has resulted in a circular caldera about 3 km in diameter, with the highest point reaching 355 meters above sea level.