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Alkali feldspar - Wikipedia

The alkali feldspar group are those feldspar minerals rich in the alkali elements, potassium and sodium. The alkali feldspars include albite, anorthoclase, microcline

alkali feldspar | mineral | Britannica.com

alkali feldspar mineral, a high-temperature form of potassium aluminosilicate (KAlSi 3 O 8) that sometimes occurs in surface rocks. Sanidine forms colourless or white ...

Feldspar - Wikipedia

Feldspar crystal (18×21×8.5 cm) from Jequitinhonha valley, Minas Gerais, Southeastern Brazil. General; Category: Tectosilicate: Formula (repeating unit) K Al Si 3 O ...

Alkali Feldspar | Definition of Alkali Feldspar by Merriam ...

Define alkali feldspar: feldspar containing alkali metals (such as sodium or potassium or both) but little calcium

Alkali Feldspar: Alkali Feldspar mineral information and data.

Smith, J.V., MacKenzie, W.S. (1958) Alkali feldspars. IV. The cooling history of high-temperature sodium-rich feldspars. American Mineralogist: 43: 872-889.

feldspar - Identification of specific feldspars | mineral ...

Alkali feldspars can often be distinguished from plagioclase feldspars because most grains of the latter exhibit albite twinning (see above Crystal structure), which ...

Feldspar Distinctions, Characteristics & Identification

About Feldspar. Search the site GO. Science. Geology Types of Rocks ... Alkali Feldspar in Detail. Alkali feldspar has the formula KAlSi 3 O 8, potassium aluminosilicate.

Rock Library | Imperial College London

Alkali feldspar ((K,Na)AlSi 3 O 8) Synonyms: Perthite. Silicate, Tektosilicate, Feldspar How to use crystal diagram: Alkali feldspars are feldspars rich in Na and K.

An introduction to minerals and rocks under ... - OpenLearn

Anyone can learn for free on OpenLearn, ... An introduction to minerals and rocks under ... Feldspars with compositions within this range are called alkali feldspars.

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