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What is the long dimension of a perthite?

Long dimension of field is 0.4 mm. Perthite is used to describe an intergrowth of two feldspars: a host grain of potassium-rich alkali feldspar (near K-feldspar, KAlSi 3O 8, in composition) includes exsolved lamellae or irregular intergrowths of sodic alkali feldspar (near albite, NaAlSi 3O 8, in composition).

What kind of grain is a perthite grain?

Perthite is used to describe an intergrowth of two feldspars: a host grain of potassium-rich alkali feldspar (near K-feldspar, KAlSi 3O 8, in composition) includes exsolved lamellae or irregular intergrowths of sodic alkali feldspar (near albite, NaAlSi 3O 8, in composition).

How are the intergrowths of perthite different?

The intergrowths in perthite have a great variety of shapes. If cooling is sufficiently slow, the alkali feldspar may exsolve to form separate grains with near-endmember albite and K-feldspar compositions.

What kind of metal is a perthite made of?

Perthite is a blend of microcline, albite and oligoclase. It is usually brown and white. May have gold or white iridescence. Perthite Information


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