Alkaline Rocks and Carbonatites of the World

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Porto Nacional

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Occurrence number: 
025-00-017
Country: 
Brazil
Region: 
Goias
Location: 
Longitude: -48.77, Latitude: -10.5

An intrusion composed of rock described as litchfieldite occurs at Morro da Estrela, 45 km northwest of the town of Porto Nacional. The rock comprises 40-65% albite/oligoclase, 3-30% microcline, 15-30% nepheline, which is partly replaced by cancrinite and zeolite, 0-15% biotite and accessories including sodalite, cancrinite and rare fluorite.

References: 
MARCHETTO, C.M.L. 1973. Nota sobre a ocorrencia de um litchfieldito no Morro da Estrela, Municipio de Porto Nacional (Goias). Anais Congresso Brasileiro de Geologia, 27: 85-6
Location: 
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith