Labradorite

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Famed for a vivid iridescence known as labradorescence, labradorite is a calcium-rich plagioclase feldspar whose flashes of blue, gold, green, orange, and red arise from light interference between fine twinning layers inside the stone. It was first found in 1770 on Canada's Labrador Peninsula, the source of its name; major gem material now comes from Madagascar, Finland, and Mexico, and the Finnish variety spectrolite shows especially dramatic full-spectrum color. Crystallizing in the triclinic system, it measures 6.0 to 6.5 on the Mohs scale. Moderately priced and semi-precious, labradorite is one of the most widely used stones in modern jewelry and lapidary work.

Physical & Optical Properties

Category Semi-Precious Gems

Mohs Hardness 6,0 – 6,5

Specific Gravity 2,69 – 2,72

Refractive Index 1,554 – 1,573

Crystal System Triclinic

Luster Vitreous

Cleavage Perfect

Fracture Uneven

Color various

Birefringence 0,007

Pleochroism From the Congo, red stones show weak pleochroism whilst greenstones have distinct greenish yellow to bluish green pleochroism

Mohs Hardness

Mohs hardness of Labradorite shown against the ten reference minerals, from talc (1) to diamond (10).

Mohs	Reference mineral	Labradorite
1	Talc
2	Gypsum
3	Calcite
4	Fluorite
5	Apatite
6	Orthoclase	●
7	Quartz
8	Topaz
9	Corundum
10	Diamond

Crystal System

Value & Market

Price Tier Moderate ($50-500/ct)

Where to Buy Labradorite

Blue Nile Fine jewelry retailer

James Allen Gemstone jewelry

Brilliant Earth Ethically sourced gems

Amazon Wide selection

Links may earn a commission at no extra cost to you.

About Labradorite

A labradorite é uma pedra de feldspato plagioclase famosa pelo fenómeno da labradorescência — uma iridescência metálica que exibe cores de azul, verde, dourado, laranja e por vezes violeta que mudam com o ângulo de observação. Este jogo de cores é causado pela interferência da luz entre camadas internas alternadas de composição ligeiramente diferente. A variedade com labradorescência excecional em todo o espetro é chamada "espetrolite" (da Finlândia). A Labradoreia (Canadá) dá o nome à pedra.