Agate (raw)

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Natural agate from a South Island river.

Agate is a term for irregularly- and concentrically-layered masses of microcrystalline quartz. Layers consist of translucent or opaque, microcrystalline, fibrous quartz called chalcedony. Impurities in different layers create different colours such as clearish-whitish-grayish, brownish-red, and yellowish-brown.

Size: Hand specimen.

Locality: South Island, New Zealand.

Images are examples of specimens only. Sizes and shapes may vary.