mineral

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

Hardness: 6-6.5 (Mohs), Color: Dark grey to grey-black with flashes of blue, green, and gold, Luster: Vitreous to pearly, Crystal Structure: Triclinic, Cleavage: Perfect in two directions.

Hardness: 6-6

Identified July 18, 2026More mineral →

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Physical properties

Hardness: 6-6.5 (Mohs), Color: Dark grey to grey-black with flashes of blue, green, and gold, Luster: Vitreous to pearly, Crystal Structure: Triclinic, Cleavage: Perfect in two directions.

Formation & geological history

Formed in mafic igneous rocks such as basalt, gabbro, and norite, as well as in some metamorphic rocks. It crystallizes from cooling magma at high temperatures. High-quality specimens are often found in Anorthosite complexes.

Uses & applications

Used extensively in jewelry as gemstones (cabochons), ornamental decor, countertop surfaces, and as a popular specimen for mineral collectors.

Geological facts

Labradorite exhibits a unique optical phenomenon called 'labradorescence,' which is caused by light reflecting off microscopic layers (lamellae) of different compositions within the mineral. It was first discovered in Labrador, Canada, in 1770.

Field identification & locations

Identify in the field by looking for a grey to dark rock that reveals vibrant metallic flashes of color when tilted under a light source. Commonly found in Canada, Madagascar, Finland (where it is known as Spectrolite), and Russia.