Labradorite Composition, Crystallization & Structure

Composition. Intermediate between albite and anorthite, corresponding chiefly to 1NaAlsi3O8.3CaAl2Si2O8.

Crystallization. Triclinic. Like albite.

Structure. In cleavable masses. Crystals rare.

Physical Properties. Cleavage in two directions at 86° 5’. One cleavage (parallel to base) better than the other, and on this parallel striation lines due to twinning are commonly shown. H. = 6. G.= 2.73. Vitreous luster. Usually gray, brown or greenish; sometimes colorless or white. Often shows a beautiful play of colors, due in part to the intimate twinning structure, in part to inclusions. Transparent to opaque.

Tests. Same as for oligoclase

Occurrence. Like albite, but more commonly in the darker colored basic igneous rocks, and usually associated with pyroxene or amphibole. Thus, it occurs in diorite, gabbros, norite, andesite, basalt, etc. Found on the coast of Labrador in large amounts, associated with hypersthene and magnetite, and when polished showing a fine iridescent play of colors.

Use. As an ornamental stone.

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