Rock Identifier
Labradorite (Dark Matrix) (Plagioclase Feldspar ((Ca, Na)(Al, Si)4O8)) — mineral
mineral

Labradorite (Dark Matrix)

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

Hardness: 6-6.5 Mohs; Color: Dark gray to black body color; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Two directions at nearly 90 degrees; Specific Gravity: 2.68-2.72.

Hardness
6-6
Color
Dark gray to black body color
Luster
Vitreous to pearly
Identified More mineral →

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Physical properties

Hardness: 6-6.5 Mohs; Color: Dark gray to black body color; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Two directions at nearly 90 degrees; Specific Gravity: 2.68-2.72.

Formation & geological history

Formed in mafic igneous rocks like basalt and gabbro through the slow cooling of magma. It is characterized by the exsolution of different feldspar layers during cooling, which creates the labradorescence effect.

Uses & applications

Commonly used in jewelry (cabochons), interior design (countertops, tiles), and as a popular specimen for metaphysical and mineral collectors.

Geological facts

Labradorite exhibits a unique optical effect known as labradorescence, caused by internal light scattering from submicroscopic planes. It was first discovered in Labrador, Canada, in 1770.

Field identification & locations

Identify in the field by looking for flashes of blue, green, or gold (labradorescence) against a dark gray background when tilted under light. Commonly found in Canada, Madagascar, and Norway. High-quality pieces show vibrant multi-color flashes.

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