Story: Rock and mineral names

Greywacke under the microscope (2nd of 2)

Greywacke under the microscope

This is a thin section (a microscope slice, 3 millimetres wide) of greywacke – an assortment of angular grains in a fine-grained clay. The clear grains are mainly quartz, while many of the cloudy grains are feldspar.

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Photograph by Nick Mortimer

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How to cite this page:

Simon Nathan, 'Rock and mineral names - Local names', Te Ara - the Encyclopedia of New Zealand, (accessed 24 April 2024)

Story by Simon Nathan, published 12 Jun 2006