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Andesine

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description Andesine Overview

Andesine is a plagioclase feldspar mineral with a composition intermediate between albite and anorthite. It is named after the Andes Mountains, where rocks containing the mineral are widespread. Andesine commonly occurs in volcanic and metamorphic rocks and may appear white, gray, yellow, green, or reddish brown. Transparent material has been sold as a gemstone, although some red or strongly color-changing specimens have been subject to questions about origin and treatment.

help Andesine FAQ

Is the red andesine sold in jewelry natural?

Buyers should be cautious: in the late 2000s, investigations including work by the GIA found that much of the red and green andesine flooding the market had been copper-diffusion treated labradorite rather than natural material. The scandal sharply reduced confidence in red andesine as a gem.

What is the difference between andesine and labradorite?

Both are plagioclase feldspars distinguished by calcium content: andesine sits at roughly 30 to 50 percent anorthite, while labradorite occupies the 50 to 70 percent range. They are adjacent members of the same solid-solution series between albite and anorthite.

Why is the mineral called andesine?

It is named after the Andes Mountains, where rocks containing the mineral are widespread, especially in volcanic terrains. Andesine commonly occurs in volcanic and metamorphic rocks rather than as large gem crystals.

Is andesine durable enough for everyday jewelry?

With a Mohs hardness of about 6 to 6.5, typical of feldspar, it is reasonably durable but softer than quartz. Faceted red andesine was popular in the mid-2000s, before the treatment controversy undercut demand.

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