igneous

Labradorite (specifically Larvikite beads)

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

Hardness: 6.0-6.5 Mohs scale; Color: Gray to black background with blue or silvery flash (labradorescence/Schiller effect); Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions.

Hardness: 6
Luster: Vitreous to pearly

Identified April 7, 2026More igneous →

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Physical properties

Formation & geological history

Formed through the crystallization of mafic igneous rocks (anorthosite or monzonite). The optical effect is caused by the exsolution of different feldspar minerals during slow cooling of magma, creating layers that diffract light.

Uses & applications

Primarily used for ornamental purposes, including jewelry (beads, cabochons), interior design (countertops, tiles), and as a popular specimen for crystal collectors.

Geological facts

Labradorite was first discovered on Paul's Island in Labrador, Canada, in 1770. The metallic play of colors is officially known as labradorescence. High-quality versions from Finland are specifically called Spectrolite.

Field identification & locations

Identify by rotating under a light source to find the 'flash' or play of color. In the field, look for dark, crystalline rocks where light glints off specific planes. Common locations include Labrador (Canada), Madagascar, Norway (Larvik), and Finland.

Other igneous specimens

See all

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

mineral

Dark Igneous Rock (Likely Basalt or Diabase)

Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.

Igneous

Magnetite

Iron(II,III) oxide (Fe3O4)

mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

mineral

Blue Apatite

Apatite (Group), Ca5(PO4)3(F,Cl,OH)

mineral

Magnetite

Magnetite (Fe3O4)

mineral