Mineral

Labradorite (tumbled)

Labradorite (a plagioclase feldspar mineral between anorthite and albite; chemical formula: (Ca,Na)(Si,Al)4O8)

Hardness: 6 to 6.5 on Mohs scale. Color: Typically dark grey, greenish, or brownish, but displays a iridescent optical effect known as labradorescence, which can show brilliant flashes of blue, green, yellow, orange, and red. Luster: Vitreous to pearly. Crystal Structure: Triclinic.…

Hardness: 6 to 6
Luster: Vitreous to pearly

Identified September 14, 2025More mineral →

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Physical properties

Formation & geological history

Labradorite forms in basic and ultrabasic igneous rocks such as basalt, gabbro, and anorthosite. It also occurs in some metamorphic rocks and as detrital grains in sedimentary rocks. The labradorescence is caused by light scattering off minute exsolution lamellae (thin layers) of various feldspars within the crystal structure. Geological age varies depending on the host rock, often found in ancient igneous intrusions.

Uses & applications

Primarily used as a gemstone and ornamental stone due to its striking labradorescence. It is carved into cabochons, beads, sculptures, and used in jewelry. Larger pieces are used for countertops, tiles, and other decorative architectural applications. Collectors value well-formed crystals and specimens with strong, colorful iridescence.

Geological facts

Labradorite was first described in 1770 by Moravian missionaries on the island of Paul's Island near Nain in Labrador, Canada, from which it derives its name. It is sometimes known as Spectrolite when it displays a full spectrum of colors, particularly a vivid blue, green, purple, and red play of color. It is considered a 'stone of magic' by some and is believed to enhance intuition and spiritual connection.

Field identification & locations

In the field, look for dark, opaque rocks that, when rotated in light, show flashes of vibrant color. The effect is called labradorescence and is the primary identifying characteristic. It is commonly found in Canada (Labrador), Norway, Finland (where the term Spectrolite originated), Madagascar, Russia, Australia, Mexico, and the United States. Tumbled stones like the one pictured are often sold for jewelry making or as decorative pieces.

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