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Red andesine is a reddish variety of the plagioclase feldspar mineral andesine, known for its vibrant color and often a metallic "schiller" effect. It typically exhibits a range of reddish hues, from honey-red to deep red, sometimes with yellow or green accents. While natural deposits exist, many red andesines on the market are artificially colored through diffusion treatment.

Here's a more detailed look:

Appearance:

Color:

Red andesine displays a range of reddish tones, including honey-red, orange-red, and deep red. Some specimens may also show hints of green or yellow.

Luster:

It can have a glassy to matte shine, with a metallic "schiller" or aventurescence (a glittery effect) caused by light reflecting off microscopic inclusions like hematite.

Transparency:

Red andesine can be translucent to transparent, though some may be opaque due to numerous inclusions.

Inclusions:

Inclusions are common in andesine, and while they don't detract from the gem's beauty, they can affect its clarity.

Formation and Treatment:

Natural Andesine:

Andesine forms in igneous rocks and is found in various locations, including the Andes Mountains (where it gets its name).

Diffusion Treatment:

Many red andesines, particularly those with vibrant colors, are created by diffusing copper into yellow labradorite, a related plagioclase feldspar.

Physical Properties:

Hardness: Andesine has a hardness of 6 to 6.5 on the Mohs scale.

Composition: It's a solid solution of calcium and sodium feldspar, with a chemical formula of (Ca,Na)(Al,Si)AlSi2O8.

Uses:

Jewelry:

Red andesine is often used in jewelry, though its hardness makes it less ideal for rings.

Substitution:

It's sometimes used as an alternative to more expensive gemstones like ruby or spinel.

Metaphysical Properties:

Some believe andesine can promote emotional balance, creativity, and intuition.