mineral
Labradorite
(Ca, Na)(Al, Si)4O8
Hardness: 6-6.5 Mohs. Color: Gray, green, or blue with a characteristic iridescent play of color (labradorescence). Luster: Vitreous to pearly. Crystal system: Triclinic.
- Hardness
- 6-6
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-6.5 Mohs. Color: Gray, green, or blue with a characteristic iridescent play of color (labradorescence). Luster: Vitreous to pearly. Crystal system: Triclinic.
Formation & geological history
Formed in mafic igneous rocks such as basalt and gabbro, as well as in some metamorphic rocks and anorthosites. It crystallizes from cooling magma deep within the Earth's crust.
Uses & applications
Primarily used as a gemstone in jewelry, for decorative items, and as a popular specimen for mineral collectors. Some high-quality labradorite is used in architectural stone.
Geological facts
Labradorite was first discovered in Labrador, Canada, in 1770. The spectacular flash of color, known as labradorescence, is caused by internal light reflections from sub-microscopic layers of exsolution lamellae.
Field identification & locations
Identify by its 'Schiller effect' when tilted under light. Significant deposits are found in Canada, Madagascar, Norway, and Finland (where a high-grade variety called Spectrolite is found).
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