Labradorite: Discover the secrets of this stone with mysterious reflections

Labradorite

labradorite belongs to the plagioclase feldspar group and is known for its unique optical phenomenon, labradorescence. This phenomenon results from the diffraction of light on the thin layers of its crystalline structure. Discovered in Labrador, Canada, it is now mined in several regions around the world. Used in jewelry, decoration, and collection, it is also a subject of study in mineralogy.

Identity card

• Scientific name : Labradorite

• Other names / Varieties : spectrolite (Finnish variant)

• Crystal system : Triclinic

• Colors : Gray, green, blue, yellow, with iridescent reflections

• Transparency / Luster : Transparent to translucent, vitreous to submetallic luster

Origin and training

labradorite is a mineral that forms primarily in igneous and metamorphic rocks. Its formation process begins in magmatic environments, where the slow cooling of the magma allows the crystallization of plagioclase feldspars, of which it is a part. It is often found in rocks such as gabbros, norites, and anorthosites, which are rich in feldspars. In some cases, labradorite can also appear in metamorphic rocks as a result of mineralogical transformations due to pressure and temperature. This mineral develops in specific geological conditions that favor the formation of thin internal lamellae responsible for the phenomenon of labradorescence, a characteristic optical effect that gives it its shimmering reflections.

Chemically, labradorite belongs to the plagioclase feldspar series and its general formula is (Ca,Na)(Si,Al)₄O₈. It is composed mainly of sodium (Na), calcium (Ca), silicon (Si), aluminum (Al), and oxygen (O). Its crystal system is triclinic, meaning that its crystals have no right angles and exhibit complex shapes. Its internal structure is made up of microscopic intercalations of layers of slightly different composition, which cause light interference responsible for its iridescent glow. This optical phenomenon, known as labradorescence, is due to the diffraction of light as it passes through the thin internal layers of the mineral, creating spectacular plays of color ranging from blue to green, orange, and gold.

Main deposits

The main deposits of labradorite are located in several regions of the world:

• Canada (Labrador) : First discovery site, renowned for its specimens with blue reflections.

• Finland : spectrolite, a particularly colorful variety, is mined in this region.

• Madagascar : Provides high quality stones with golden and green reflections.

• Russia : Has labradorite deposits with a cooler color spectrum.

• United States : Some farms are located in Oregon.

Properties and uses

General uses

labradorite is used in jewelry for making cabochons, beads, and decorative objects. Its hardness and cleavage make it a relatively fragile stone, requiring delicate handling. In collections, specimens with intense labradorescence and vivid colors are highly sought after. Collectors are advised to choose stones with labradorescence visible from different angles. It is important to note that labradorite poses no risk of toxicity or radioactivity. labradorite, as a feldspar, can serve as a geological indicator of rock formation conditions.

Main areas of use

• Jewelry : Used for making bracelets, necklaces, pendants and rings.

• Art and decoration : Sculptures, decorative objects and various ornaments.

• Collection : Highly prized by collectors for its unique reflections.

• Industrial uses : Used in certain applications requiring feldspars rich in calcium and sodium.

• Scientific uses : Subject of study in mineralogy for its phenomenon of labradorescence.

History and mythology

Discovery and origin of the name

labradorite was discovered in 1770 by Moravian missionaries on the coast of Labrador, Canada. Its name comes directly from this region, where the first specimens were identified and described. This shimmering stone quickly captivated European naturalists, who studied its unique optical properties. Its iridescent phenomenon, dubbed labradorescence, intrigued scientists and mineralogists of the time, who sought to understand the origin of these colorful metallic reflections.

Legends and beliefs

According to Inuit mythology, labradorite is said to have originated from the Northern Lights. An ancient legend tells of an Inuit warrior, discovering a dull rock, striking its surface with his spear, releasing some of the Northern Lights trapped within. This is how labradorite was born, preserving these mysterious celestial lights.

In other cultures, labradorite was seen as a celestial stone, falling from the sky in the form of starbursts. Some Native American tribes considered it a talisman that fostered connection with nature spirits. In Finland, where a particularly colorful variety called spectrolite was discovered during World War II, it was sometimes associated with protection and inner strength.

Famous specimens

Among the most notable specimens of labradorite, some stand out for their rich reflections and rarity. spectrolite from Finland is one of the most prized varieties, due to its wide range of colors, ranging from deep blue to violet, orange, and bright green.

Large pieces of labradorite extracted in Madagascar, sometimes weighing several hundred kilograms, are also highly sought after, particularly for the carving of decorative and artistic objects.

Historical significance

Although labradorite has not played as central a role in history as other minerals such as gold or silver, it has always fascinated people with its unique appearance. Since its discovery in Europe, it has been used for ornamentation and decorative art, particularly in the form of cabochons mounted on jewelry or as inlays in luxurious furniture.

In the 20th century, with the development of modern mineralogy and jewelry, labradorite gained popularity. Today, it is prized not only by collectors and jewelers, but also by artisans who carve it into spheres, pyramids, pendants, and decorative objects, showcasing it in original creations.

How to identify it

Identification of a true specimen

• Presence of labradorescence with iridescent reflections

• Hardness between 6 and 6.5 on the Mohs scale

• Triclinic crystal structure

• Perfect cleavage in certain directions

Things to check

• Reflections : A real labradorite shows a phenomenon of labradorescence.

• Hardness : It can be scratched by a knife but not by glass.

• Weight and density : Compared to a glass imitation, it will be denser.

• Origin : Favor reliable sources to avoid counterfeits.
  

How to maintain it?

Care instructions

• Clean with warm water and mild soap.

• Avoid chemicals and acids.

• Store away from shocks to preserve its shine.

• Avoid prolonged exposure to strong light or heat.

Specific maintenance methods

• Cleaning : Use a soft cloth or soft brush to avoid scratching the surface.

• Protection : Store separately to avoid scratches.

• Exposure to light : Prefer soft lighting to avoid altering reflections.

• Precautions : Handle with care, avoid drops and impacts.

• Tools and materials needed : Velvet storage box, soft cloth, warm water.

Conclusion

labradorite is a fascinating mineral, prized for its unique beauty and captivating reflections. Whether used for collecting, jewelry, or decoration, it remains a must-have for mineral lovers.