Chalcedony consists of microscopic crystals of quartz, so small that they can only be seen under the microscope. Different coloured forms are given different names; for example, carnelian is reddish. Agate is a specific form of chalcedony that has parallel banding.
Te whakamahi i tēnei tūemi
Te Ara - The Encyclopedia of New Zealand
Photograph by Alastair McLean
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