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| Spreustein from Kola Peninsula |
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Spreustein SPREUSTEIN - little-known stone which has 2 deposits in the world (Kola peninsula and Greenland). Its name occurs from German "spreu" - "head" and "stein" - "stone". It is the product of change nepheline and sodalite, has confusingly-fibrous (radiant) structure and red color of various shades. Owing to sufficient durability, spreustein it is used as an ornamental stone. en.wikipedia.org Several varieties of natrolite have been distinguished by special names. Fargite is a red natrolite from Glenfarg in Perthshire. Bergmannite, or Spreustein, is an impure variety which has resulted by the alteration of other minerals, chiefly sodalite, in the augite syenite of southern Norway. |
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