Andesine: Meaning, Properties, Colors & Value

TOC

• 1. What Is Andesine?
• 2. Andesine Meaning & History
• 3. Andesine Properties
• 4. Andesine Colors
• 5. Treatment & How to Identify Andesine
• 6. Andesine Value
• 7. Andesine Meaning & Symbolism (Traditional Beliefs)
• 8. Andesine FAQ
• 8-1. What is andesine?
• 8-2. Is andesine treated?
• 8-3. Is red andesine natural?
• 8-4. What is the difference between andesine and labradorite?
• 8-5. How hard is andesine and how do I care for it?
• 9. Shop Andesine at KenKenGems

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Andesine

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What Is Andesine?

Andesine is a plagioclase feldspar, one of the most common mineral groups in the Earth's crust. It sits in the albite–anorthite (sodium–calcium) series between oligoclase and labradorite, which is why some material is described in the trade as "andesine-labradorite." As a gem it is best known for warm champagne, red, and green colors and, in some stones, a shimmering optical effect.

In this guide we cover what andesine is, its meaning and history, physical and chemical properties, colors, how the material is treated and identified, its value, and the traditional beliefs associated with it. Because much red and green "andesine" on the market has been color-treated, we give treatment and disclosure special attention below. To see what is currently available, browse the andesine collection.

Andesine Meaning & History

Andesine was first described in 1841 by the German geologist Hermann von Abich, who studied plagioclase samples from volcanic rock in the Andes mountains of South America. The name comes from the Andes, where the mineral was recognized as a distinct member of the plagioclase series. Andesine occurs worldwide, including in the Democratic Republic of the Congo, China, Tibet, Mongolia, Japan, France, Italy, Germany, Russia, the United States, and elsewhere.

In gemstone folklore, andesine is often linked with the sun, warmth, and optimism, reflecting its glowing champagne-to-red colors. Its modern reputation, however, is inseparable from a well-known industry controversy. In the early 2000s a wave of vivid red and green "andesine" reached the market, much of it traced to China; a large share was later shown to have been artificially colored by a copper-diffusion process, while a limited source of naturally colored material in Tibet was verified only after extensive debate. As a result, treatment disclosure is essential when buying red or green andesine (see below).

Andesine Properties

Chemically, andesine is a plagioclase feldspar with a composition roughly 30–50% anorthite (calcium) and 50–70% albite (sodium), giving the general formula (Na,Ca)(Si,Al)4O8. It is triclinic, typically shows twinning, and has perfect cleavage in one direction and good cleavage in another. With a Mohs hardness of about 6 to 6.5 and a tendency to be brittle, andesine is more delicate than quartz, so it is often cut en cabochon and set in protective mountings.

Property	Detail
Mineral / group	Plagioclase feldspar (albite–anorthite series; between oligoclase and labradorite)
Chemical composition	(Na,Ca)(Si,Al)4O8; roughly 30–50% anorthite (An30–50)
Crystal system	Triclinic (commonly twinned)
Mohs hardness	~6 – 6.5
Cleavage	Perfect in one direction {001}, good in another {010}
Tenacity / fracture	Brittle; uneven to conchoidal fracture
Luster	Vitreous to subvitreous, sometimes pearly on cleavage
Transparency	Transparent to translucent
Optical effects	Schiller / aventurescence in some stones; iridescence in andesine-labradorite

Some translucent material shows a shimmer or schiller from tiny inclusions. Iridescent stones from Madagascar are sometimes sold as "andesine-labradorite" or under moonstone-style trade names; because these overlap with labradorite, ask exactly which mineral and effect you are buying.

Andesine Colors

Naturally, andesine ranges from colorless and pale gray to soft champagne, yellow, and orange tones. Green and especially red are the colors most associated with gem andesine, and they are also the colors most likely to have been enhanced. Some stones display a subtle schiller or aventurescent glow, and copper-bearing plagioclase can resemble Oregon sunstone.

• Champagne / yellow / orange – warm, often naturally colored tones; the most common gem hues.
• Red – the signature look of many marketed "red andesine"; frequently the result of copper-diffusion treatment. Naturally colored red material is rare and its provenance has been disputed.
• Green – also strongly associated with treated "andesine" from the same market episode; verify treatment before buying.
• Bi-color (red-green) – prized for a two-tone effect; treatment status should still be disclosed.

Because color is central to how andesine is priced and marketed, it is exactly where disclosure matters most. The next section explains how the material is treated and how to shop with confidence.

Treatment & How to Identify Andesine

This is the most important section for anyone buying red or green andesine. Much of the vivid red and green "andesine" (sometimes sold as "red andesine" or "andesine sunstone") that entered the market in the 2000s was later shown to be copper-diffusion treated, meaning the color was introduced or intensified in a lab rather than occurring naturally. Under the FTC Jewelry Guides, any such treatment must be disclosed, and naturally colored red andesine is rare with provenance that has been disputed. We do not present color as guaranteed natural or untreated unless it is specifically documented.

• Natural (untreated) andesine – mined material whose color is natural; because natural red is rare and contested, ask for documentation and, where available, an independent lab report.
• Diffusion-treated andesine – natural feldspar whose red or green color was produced or deepened by copper diffusion. This is a legitimate product when disclosed, but it must be identified as treated.
• Imitation / substitute – glass or another material sold to look like andesine; it must be described as an imitation, not as andesine.

How to shop with confidence: ask the seller directly whether the stone is treated and by what method; request written treatment disclosure; and for higher-value red or "natural-color" claims, ask for a report from an independent gemological laboratory. Diffusion treatment can be difficult to detect by eye, so a lab is the reliable way to confirm identity and treatment. Treated stones are perfectly enjoyable to wear and collect when they are clearly and honestly disclosed.

Andesine Value

Andesine is generally an affordable gemstone, and its price varies widely depending on color, color intensity, clarity, cut, size, and any optical effect such as schiller. As a rule, warm champagne and pale tones are the most accessible, while attractive, well-cut colored stones command more.

Treatment status is one of the biggest factors in value. Because so much red and green andesine has been copper-diffusion treated, documented natural-color material is scarce and typically carries a significant premium, while treated stones are more affordable. When comparing prices, always confirm whether a stone is natural or treated, since the two are not equivalent. Cutting also matters: cabochons are common because of the mineral's brittleness, while faceted stones can cost more due to the extra work involved.

Andesine Meaning & Symbolism (Traditional Beliefs)

These are traditional beliefs, not medical claims. Andesine is not medicine and cannot diagnose, treat, cure, or prevent any illness; consult a qualified professional.

In crystal lore, andesine is a stone of the sun, and it is traditionally believed to carry warmth, optimism, and encouragement. Collectors and practitioners have long associated it with the ideas below. These associations come from folklore and metaphysical tradition, not from science, and are shared here for cultural interest only:

• Traditionally believed to encourage a positive, optimistic outlook.
• In crystal lore, associated with motivation, confidence, and follow-through, which is why it is a popular choice for students and creatives.
• Historically kept as a talisman said to symbolize abundance and good fortune.
• Popularly regarded as a grounding, uplifting stone for meditation and everyday carry.

Andesine FAQ

What is andesine?

Andesine is a plagioclase feldspar in the albite–anorthite series, sitting between oligoclase and labradorite. It is valued as a gem for its champagne, red, and green colors and, in some stones, a shimmering schiller effect.

Is andesine treated?

Often, yes. Much of the red and green "andesine" on the market has been copper-diffusion treated to create or deepen its color, and this must be disclosed under the FTC Jewelry Guides. Naturally colored red andesine is rare and its provenance has been disputed, so ask for treatment disclosure and, for higher-value stones, an independent lab report.

Is red andesine natural?

Some naturally colored red andesine exists, but a large share of marketed red andesine is copper-diffusion treated. Do not assume the color is natural; ask the seller and request documentation before buying.

What is the difference between andesine and labradorite?

Both are plagioclase feldspars, but labradorite contains more calcium (anorthite) than andesine. Iridescent gems are sometimes sold as "andesine-labradorite," so confirm the exact mineral and optical effect with the seller.

How hard is andesine and how do I care for it?

Andesine is about 6 to 6.5 on the Mohs scale and can be brittle with easy cleavage, so it is softer and more delicate than quartz. Clean it with warm water, mild soap, and a soft cloth, avoid ultrasonic and steam cleaners, and store it separately from harder gems.

Shop Andesine at KenKenGems

Looking for andesine for jewelry making or collecting? At KenKenGems you will find andesine in a range of sizes and shapes, including strands, loose stones, and finished pieces such as beaded bracelets and pendants. We aim to describe our material clearly, including color and any treatment, so you know what you are buying.

Browse the full andesine collection to see what is currently available, and explore related feldspars in our labradorite and sunstone collections.

Wide variety of our Andesine collection