Perthite. This mineral is a rock formed from interspersed layers of sodium and potassium feldspar minerals. Feldspars are aluminosilicates that are th

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Perthite. This mineral is a rock formed from interspersed layers of sodium and potassium feldspar minerals. Feldspars are aluminosilicates that are the most common components of igneous rocks (those formed from magma). Specimen found in Perth, Ontario, Canada.

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