GEOLOGICAL SPECIMENS MINERAL PLAGIOCLASE FELDSPAR

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Labradorite ((Ca, Na)(Al, Si)4O8), a feldspar mineral, is an intermediate to calcic member of the plagioclase series. It has an anorthite percentage (%An) of between 50 and 70. The specific gravity ranges from 2.68 to 2.72. The streak is white, like most silicates.
Streak: white
Twinning: Common by Albite, Pericline, Carlsb...
Specific gravity: 2.68 to 2.72
Color: Gray, gray-white, brown, greenish, pale ...