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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