mineral
Labradorite
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
AI-generated identification · may be incorrectHardness of 6-6.5 on the Mohs scale, exhibits vitreous luster and a characteristic iridescent play of colors known as labradorescence. It crystallizes in the triclinic system with perfect cleavage in two directions.
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Physical properties
Hardness of 6-6.5 on the Mohs scale, exhibits vitreous luster and a characteristic iridescent play of colors known as labradorescence. It crystallizes in the triclinic system with perfect cleavage in two directions.
Formation & geological history
Forms primarily in mafic igneous rocks such as basalt and gabbro through slow cooling of magma, allowing the separation of lamellae that cause optical interference.
Uses & applications
Extensively used as a gemstone in high-end jewelry, carved into decorative objects, and occasionally as a dimension stone.
Geological facts
Named after the Labrador peninsula in Canada where it was first discovered in 1770. Its stunning iridescence is caused by light diffraction between microscopic mineral layers.
Field identification & locations
Readily identified by its dark grey to black body color combined with vibrant flashes of blue, green, or gold when rotated in light. Found in Canada, Madagascar, Finland, and Australia.
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Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral