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English: Labradorite (( Ca,Na)(Al,Si)4O8), a feldspar mineral, is an intermediate to calcic member of the plagioclase series. It is usually defined as having "%An" (anorthite) between 50 and 70. The specific gravity ranges from 2.71 to 2.74. The streak is white, like most silicates. The refractive index ranges from 1.555 to 1.575. Twinning is common. As with all plagioclase members the crystal system is triclinic and three directions of cleavage are present two of which form nearly right angle prisms. It occurs as clear, white to gray, blocky to lath shaped grains in common mafic igneous rocks such as basalt and gabbro, as well as in anorthosites.
Labradorite detail.jpg
mineral: intermediate member of a solid solution series (50 to 70 % anorthite and albite)
Instance of mineral
Subclass of anorthite
Named after
  • Labrador Peninsula
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Media in category "Labradorite"

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