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Mineral: feldspar
Gem: sunstone
Size: 8.5 mm
Carat: 1.65 ct
Cut: round
Origin: Dust Devil Mine (Oregon) link to mine
General Info: The generic term "feldspar" comes from the Germanic term "feldt spat", meaning "mineral with prominent cleavage from the field". It was a prime constituent of many of the rocks over turned by farmers while plowing their fields. The feldspars are made up of three fundamental members and a wide number of chemical mixtures.
Additional Information
A reddish colored sunstone with good "schiller". The "schiller" effect is caused by parallel layers of copper trapped in the crystal.

The photos below show closeups of the copper particles in the layers.

The second and third photo clearly show the individual particles.