File:Biotita1.jpeg

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Biotite crystals. One is folded (kink band) (recrystalization by tectonic process). From metamorphic nepheline syenite, Rio de Janeiro (precambrian age = 500 Ma)

Cristais de Biotita. em um deles pode-se observar as lamelas dobradas (kink band) em função de sua formação em ambiente metamórfico. Local de origem: Macico alcalino de Canaã, Rio de Janeiro, Brasil

Description: Biotita

Source: created by the owner

Date: created 2005-10-10

Author: Eurico Zimbres FGEL/UERJ

Permission: Free for all use

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Date/TimeThumbnailDimensionsUserComment
current22:21, 23 August 2005Thumbnail for version as of 22:21, 23 August 2005676 × 762 (126 KB)Zimbres (talk | contribs)Cristais de Biotita
22:13, 23 August 2005Thumbnail for version as of 22:13, 23 August 2005676 × 762 (126 KB)Zimbres (talk | contribs)Cristais de Biotita. em deles pode-se observar uma estrutura dobrada em função de sua formação em ambiente metamórfico. Local: Macico alcalino de Canaã, Rio de Janeiro, Brasil

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