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Cuarcita dumortierÃtica.
Oliveira dos Brejinhos, Bahia, Brasil.
Arista del cubo 50 cm.
El color azul proviene de la abundante presencia en la cuarcita de cristales de silimanita y dumortierita. (Autor: arturo)
| Dimensions: | 730 x 542 |
| File size: | 61.44 kbytes |
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