Jasper

A dense, opaque, microcrystalline variety of chalcedony; usually red, brown or yellow and coloured by oxides of iron.

See:

Chalcedony

Jasper — specimen 0600, photo © NMNHS

Material from ‘Repository’

2 specimens: 0600 — 18.55 ct, USA, Idaho, Owyhee County, Bruneau; 0627 — 15.92 ct, Mexico, Jalisco, San Cristóbal de la Barranca (north, on the Jalisco-Zacatecas border).

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Gemmology — gemstones
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The specimens illustrated in this site do not exist in the collections of the National Museum of Natural History, Sofia.