Labradorite sclutpure Madagascar Brillant Iridence of blue


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Labradorite is a feldspar mineral of the plagioclase. It is most often found in mafic igneous rocks such as basalt, and gabbro. Most specimens have an iridescent blue, green, red, orange, and yellow. 
It comes from Madagascar. It measures at:  4in X 2 1/2in. X 1 3/8in.

Physical Properties of Labradorite

Color Usually clear, white, or gray in reflected light. Labradorescent colors can include blue, green, yellow, orange, and red. Streak White Luster Vitreous, pearly on cleavage faces Diaphaneity Transparent to translucent Cleavage Two directions of perfect cleavage intersecting at about 86 degrees Mohs Hardness 6 to 6.5 Specific Gravity 2.68 to 2.72 Diagnostic Properties Hardness, cleavage (twinning and labradorescence are only shown by some specimens) Chemical Composition (Na,Ca)(Al,Si)4O8 with Na (30-50%) and Ca (70-50%) Crystal System Triclinic