mineral

Labradorite

(Ca, Na)(Al, Si)4O8 (Plagioclase Feldspar)

Hardness: 6.0–6.5 Mohs scale; Color: Gray to black base with iridescent flashes of blue, green, and gold; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Two directions at nearly 90 degrees; Specific gravity: 2.68 to 2.72.

Hardness: 6
Luster: Vitreous to pearly

Identified March 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed in mafic igneous rocks like basalt and gabbro through the slow cooling of magma. Significant deposits are found in anorthosites. It is often associated with the Proterozoic Era (approx. 1 billion years old).

Uses & applications

Primarily used in jewelry (cabochons and beads), ornamental carvings, and high-end architectural tiles or countertops. It is highly valued in the 'metaphysical' and gem-collecting communities.

Geological facts

The optical effect seen in this specimen is known as 'labradorescence,' caused by light diffracting between microscopic layers of different mineral compositions. It was first officially discovered in Labrador, Canada, in 1770.

Field identification & locations

Identify in the field by rotating the stones under a light source to find the sudden flash of color against a dull gray-green background. Major locations include Canada (Paul's Island), Madagascar, Finland (where a variety called Spectrolite is found), and Russia.

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