SUNSTONE FELDSPAR

Technically known as oligoclase, sunstone feldspar is a species of plagioclase feldspar. It has a red metallic glitter, which is caused by light interference from tine hematite or goethite plates present within. It is mostly cut as a cabochon or as a flat surface to show this metallic effect more clearly. Sunstone feldspar is found in Norway, India, the USA, Canada and the former USSR.

Crystal Structure: Triclinic

Hardness: 6

Specific Gravity: 2.64

Refractive Index: 1.54-1.55

Colors: Orange to red brown.

Luster: Vitreous

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