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Sardonyx ( サードニクス )

Sardonyx ( サードニクス ) in Japan

Sardonyx is a compound noun: "Sard" and "Onyx".

Sard is one of varieties of the silica mineral chalcedony colored by impurities of iron oxide.

Although names carnelian and sard are often used interchangeably, sard is generally harder and darker. The color can vary greatly, ranging from pale orange to an intense almost-black coloration.

Onyx is formed of bands of chalcedony in alternating colors.

It is cryptocrystalline, consisting of fine intergrowths of the silica minerals quartz and moganite. Its bands are parallel to one another, as opposed to the more chaotic banding that often occurs in agates.

By the way, onyx primarily refers to the parallel banded variety of the silicate mineral chalcedony. Agate and onyx are both varieties of layered chalcedony that differ only in the form of the bands: agate has curved bands and onyx has parallel bands.

The following stone was sold as Sardonyx.



The background color is almost orange and there are black complicated curved bands. Since white bands is there, it may be sardonyx, however, black bands are curved and complicated, so it may be orange-white agate.

I am not sure where this stone come from. May be Brazil or India.

The remarkable point is the black bands. It is appeared only on the surface but it is very thin.

So, this stone seems to be cut to core to remove curved bands almost and only very thin black patterns are remained. It is very interesting.