Rio das Pratinhas
Arataca, Bahia, Brazil
Key Information
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Rio das Pratinhas is in Arataca, Bahia, Brazil, part of South America, known for chrysoberyl and alexandrite.
It features pegmatite rocks, formed from cooled magma, hosting these minerals.
The area has a tropical rainforest climate, supporting rich biodiversity in Serra das Lontras National Park.
Local culture blends African-Brazilian traditions, with music and cuisine reflecting this heritage.
Mining history suggests small-scale collection, likely ongoing, with limited specific records.
Geographic Location
Rio das Pratinhas is located in Arataca, a town in the state of Bahia, Brazil, in the northeastern part of South America. Bahia is on Brazil’s eastern coast, and Arataca is part of the Serra das Lontras National Park, known for its natural beauty and biodiversity. The approximate coordinates are 15° South latitude and 39° West longitude, offering a scenic backdrop for mineral exploration.
Minerals Produced
The locality is renowned for chrysoberyl, including the rare alexandrite, which changes color from green in daylight to red under artificial light due to chromium impurities. Muscovite, a type of mica, is also found here, making Rio das Pratinhas a significant site for gemstone enthusiasts.
Geological and Mining Context
The minerals are found in pegmatites, coarse-grained igneous rocks formed from slow-cooling magma, part of the ancient São Francisco Craton. While specific mining history details are sparse, it seems likely that small-scale mining or collecting has occurred, focusing on chrysoberyl and alexandrite, with activities possibly continuing today for research and trade.
Cultural and Environmental Setting
Arataca’s culture is deeply rooted in African-Brazilian traditions, with vibrant music, dance, and cuisine reflecting this heritage. The climate is tropical rainforest, with high temperatures and rainfall, supporting a diverse ecosystem within the national park, which is crucial for conservation efforts.