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Azul Bahia Granite (sodalite metasyenite, Itabuna Syenite Complex, Neoproterozoic, ~676 Ma; Fazenda Hiassu, Bahia State, Brazil) 1 | by James St. John
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Azul Bahia Granite (sodalite metasyenite, Itabuna Syenite Complex, Neoproterozoic, ~676 Ma; Fazenda Hiassu, Bahia State, Brazil) 1

Azul Bahia Granite - sodalite metasyenite from the Precambrian of Brazil.

 

“Azul Bahia Granite” from eastern Brazil has the reputation for being a very expensive decorative stone. It's distinctive in having considerable non-iridescent blue coloration. “Azul Bahia Granite” is a sodalite metasyenite (a.k.a. sodalite foyaite, sodalite foidolite), with the minerals sodalite (= blue) (Na4(Al3Si3)O12Cl), feldspars and feldspathoids (= white), mafic minerals (= black), and epidote (= greenish) (Ca2FeAl2(Si2O7)(SiO4)O(OH)). This material comes from the Itabuna Syenite Complex, a late Neoproterozoic unit (~676 Ma) that has intruded through the São Francisco Craton.

 

Locality: commercial quarry at Fazenda Hiassu, city of Itaju do Colonia, southeastern Bahia State, eastern Brazil

 

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Taken on August 2, 2014