Story: Volcanoes

Minerals from Mayor Island

Minerals from Mayor Island

The bright bottle-green crystals (called aegirine) are from the Tūhua Tephra, erupted from Mayor Island (Tūhua) about 7,000 years ago. The crystals are unusual – they’re found only in material from Mayor Island, so are used to identify Tūhua Tephra. This sample came from a core at Lake Rotomānuka, near Hamilton.

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University of Waikato
Photograph by David J. Lowe

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How to cite this page:

Richard Smith, David J. Lowe and Ian Wright, 'Volcanoes - Tephra layers – a record of past eruptions', Te Ara - the Encyclopedia of New Zealand, (accessed 14 July 2024)

Story by Richard Smith, David J. Lowe and Ian Wright, published 12 Jun 2006