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Russian Gemstones Encyclopedia

Vladimir Bukanov. Russian Gemstones Encyclopedia

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

FELDSPAR Ч FAMILY


FELDSPARS family (Feldspäten—Feldspaths—ѕолевые шпаты) Minerals of this family are of the class of silicates, subclass framework silicates. Under this name two groups are united.

A. Alkali feldspars: microcline, orthoclase and also more rare sanidine and barium-orthoclase – hyalophane.

ALKALI FELDSPAR, GROUP: MICROCLINE, ORTHOCLASE, SANIDINE, HYALOPHANE

B. Plagioclases – sodium-calcium feldspars, which are represented with minerals forming a row of constant miscibility: albite, oligoclase, andesine, labradorite, bytownite and anorthite. Among them the most interesting as jewelry-ornamental stones are albite, oligoclase and labradorite.

PLAGIOCLASE, GROUP: ALBITE, OLIGOCLASE, LABRADORITE, ANDESINE, BYTOWNITE, ANORTHITE

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