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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/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 22:21, 23 August 2005 | | 676 × 762 (126 KB) | Zimbres | Cristais de Biotita |
| 22:13, 23 August 2005 |  | 676 × 762 (126 KB) | Zimbres | 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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