mineral
Labradorite (Small Tumbled or Water-Worn Fragment)
(Ca,Na)(Al,Si)4O8
Hardness: 6-6.5 (Mohs scale), Color: Grayish-black to dark blue base with iridescent flashes (labradorescence), Luster: Vitreous to pearly, Crystal structure: Triclinic, Cleavage: Perfect in two directions, Specific gravity: 2.68-2.72
- Hardness
- 6-6
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Physical properties
Hardness: 6-6.5 (Mohs scale), Color: Grayish-black to dark blue base with iridescent flashes (labradorescence), Luster: Vitreous to pearly, Crystal structure: Triclinic, Cleavage: Perfect in two directions, Specific gravity: 2.68-2.72
Formation & geological history
Forms in igneous rocks like basalt, gabbro, and anorthosite as they cool from magma. Commonly found in areas with past volcanic activity.
Uses & applications
Primarily used as a gemstone in jewelry, cabochons, and ornamental objects. Can be used in specific architectural applications.
Geological facts
Labradorite is famous for its 'labradorescence' - an optical effect caused by internal light scattering reflecting off submicroscopic layers within the mineral. It was first discovered in Labrador, Canada.
Field identification & locations
Identify by looking for the characteristic iridescent 'flash' of color (blue, green, yellow) when turning the stone in the light. Common locations include Canada, Madagascar, Finland, and Russia.
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