igneous

Labradorite

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

Hardness: 6.0–6.5 (Mohs scale); Color: Pale green, blue, colorless, gray-white with internal iridescent flashes (labradorescence); Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.68–2.72.

Hardness: 6
Luster: Vitreous to pearly

Identified March 28, 2026More igneous →

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Physical properties

Formation & geological history

Formed in mafic igneous rocks such as basalt or norite through the crystallization of magma. It belongs to the plagioclase feldspar series and is typically associated with the Proterozoic eon, often found in anorthosite complexes.

Uses & applications

Primarily used as a gemstone in jewelry (cabochons and beads) and as an ornamental stone in architecture for countertops and tiles. It is also a popular specimen for metaphysical collectors.

Geological facts

Labradorite shows a unique optical effect known as labradorescence, caused by internal lamellar structures that diffract light. It was first discovered on Paul's Island near the town of Nain in Labrador, Canada, in 1770.

Field identification & locations

Identify in the field by rotating the specimen to find 'flashes' of color (blue, gold, or green) against a dark gray or green base. Commonly found in Canada (Labrador/Newfoundland), Madagascar, Norway, and Finland (where a high-quality variety is called Spectrolite).

Other igneous specimens

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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