mineral
Labradorite
(Ca,Na)(Al,Si)4O8
AI-generated identification · may be incorrectHardness 6-6.5 on the Mohs scale, typically gray to black, often exhibiting iridescent schiller (labradorescence), vitreous to pearly luster, triclinic crystal system, perfect cleavage in two directions.
Identified More mineral →
Explore Labradorite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness 6-6.5 on the Mohs scale, typically gray to black, often exhibiting iridescent schiller (labradorescence), vitreous to pearly luster, triclinic crystal system, perfect cleavage in two directions.
Formation & geological history
Found in mafic igneous rocks like basalt and gabbro, as well as in anorthosites. Formed by slow cooling of magma.
Uses & applications
Primarily used as a gemstone in jewelry, also utilized in ornamental objects and occasionally in countertops or architectural applications.
Geological facts
Named after the Labrador Peninsula in Canada where it was first discovered. The striking optical effect is caused by light interference from exsolution lamellae.
Field identification & locations
Identify by its characteristic labradorescence, especially flashes of blue, green, or yellow when viewed from certain angles. Common locations include Canada, Madagascar, and Finland.
