Agate (cut, hand specimen)

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Agate with one face cut to show the internal patterns and colours.  

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.

Agates can be metamorphic or volcanic in orgin.

Size: Hand specimen.

Locality: South Island, New Zealand.

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