Quartz crystals usually occur as cavity fillings in volcanic rocks and often have a pyramidal form. The purple variety of crystalline quartz is known as amethyst. The small polished piece has been cut from a slab of amethyst, then trimmed and tumbled.
Te whakamahi i tēnei tūemi
Te Ara - The Encyclopedia of New Zealand
Photograph by Alastair McLean
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13 May 2016