Jasper — specimen 0627, photo © NMNHS
Mexico, Jalisco, San Cristóbal de la Barranca (north, on the Jalisco-Zacatecas border)
Weight: 15.92 ct; size: 30.88 | 16.31 | 4.86 mm; shape: freeform; colour: medium light reddish orange; slightly brownish; clarity: opaque; cut: excellent; treatment: none.
Clean specimen; excellent cabochon style cut by Nathan Christensen, Lincoln, Nebraska.
More information from ‘Classification’
A dense, opaque, microcrystalline variety of chalcedony; usually red, brown or yellow and coloured by oxides of iron.