Green ubatuba

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Green ubatuba, polished (size 12x10 cm)

Green ubatuba (Port. verde ubatuba) is the commercial name of a Brazilian charnockite, although it often sold as a granite. It comes from the Ubatuba area of Brazil, where it forms part of the Neoproterozoic Ribeira Belt.[1] As its name indicates, it is green in color, dark green and almost a black appearance when seen in low light. It contains large (10 cm) phenocrysts of alkali feldspar.[2] It is widely used in home renovations and landscaping.

References[edit]

  1. ^ Pivko, D. (2003). "Natural stones in Earth's history". Acta Geologica Universitatis Comenianae 58: 73–86. Retrieved 28 May 2010. 
  2. ^ Vargas, T.; Motoki A. & Neves J.L.P. "Rochas ornamentais do Brasil, seu modo de ocorrencia geologica, varriedade tipologica, explotacao comercial e utilidades como materiais nobres de construcao". Revista de Geociências, 2-2 (in Portuguese). UFF. Retrieved 28 May 2010.